hybridfree/eevblog-posts huggingface dataset:
Grease and oil stain removal after years of storage - Page 1
Forum section: electronics / general

author: jpanhalt
author_rank: Super Contributor
timestamp: July 11, 2023, 08:41:41 pm
content: Attention Coppertone2: This may be of interest to you.From 1982 until 2007, I had a nice shop at a local airport. It was technically a "repair shop" and had a nice lathe, Bridgeport-like mill, and other metalworking equipment, including welders. In reality, I did a little repair gratus and made anything I needed for my hobbies.In 2007, I was forced to move and "pickled" all of my big tools for storage. They were forced to stay that way until a month or so ago. Of course, they were recovered with red-brown oil/grease stains. My usual petroleum cleaning solvent worked but was a lot of work. Enhancing it with toluene or xylenes helped, but removing the stains was still a lot of work and the added solvent strength dulled the machinery enamel.In desperation, I turned to my flux remover undiluted (previously described elsewhere in this blog). It was a miracle and removed the stains very easily. What's the secret? "ZEP heavy duty acrylic floor stippper." Its active ingredients are butyl cellosolve and ethanol amine. I suspect other DIY cellosolves might work. Pure butyl cellosolve is available from Sherwin-Williams commercial stores. I have not determined whether the ethanol amine is necessary. The ZEP product is only about 30% organics and 70% water. It is safe on most painted surfaces. I am careful not to apply it where I cannot wash or flush with a petroleum solvent, but that is probable being overly cautious. A little seepage into cracks between surfaces doesn't bother me. Cast iron under basic conditions would not rust too quickly.If you are stuck in the same situation, consider it.Regards, John
lawnmower blade as flatbar? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: April 30, 2023, 03:26:50 pm
content: So i have a busted lawn mower blade. It is going to be thrown away but I figure it would be quick to cut some flatbarish steel out with a plasma cutter, grease it and throw it on the shelf.Do you think this material is suitable for welding (mig, OA). Maybe for a sacrificial support or something.

author: Alti
author_rank: Frequent Contributor
timestamp: April 30, 2023, 05:33:06 pm
content: I do not think it is a mild steel. It should work even if you make it from something soft but it is going to loose sharpness on grass and dirt. Of course it has to be balanced. BTW, the blade cuts the grass and then ejects/pushes the grass outwards - tricky to design something efficient. Otherwise you make a blender which might not be what you want.

author: coppercone2
author_rank: Super Contributor
timestamp: April 30, 2023, 06:41:17 pm
content: Nah I meant literary to use it as a random flat bar for like fixture and stuff. Or like a bracket.

author: Monkeh
author_rank: Super Contributor
timestamp: April 30, 2023, 06:52:06 pm
content: Just put it in the scrap bin and pull out something more suitable.

author: langwadt
author_rank: Super Contributor
timestamp: April 30, 2023, 06:53:50 pm
content: waste of time for a tiny bit of unknown scraptonium, just bin it

author: coppercone2
author_rank: Super Contributor
timestamp: April 30, 2023, 07:20:10 pm
content: hmm alright if its not known to be some half decent material I guess I will chuck itSince I got a sheet deburring tool, I have been saving some sheet metals in stacks. Cut them flat with a auto sheer and run it with the deburring tool and then it can be stacked, just throw away the bent bits. Copper can be rolled out with a rolling pin too, then stacked.. just remove sharp edges of any kind and make it rectangular. IMO useful because you can do a free battery cover replacement or something

author: tautech
author_rank: Super Contributor
timestamp: July 11, 2023, 07:42:58 am
content: Save it.Tough wear resistant stuff which holds an edge well too.I keep some for making specialist wood plane irons for a Stanley 45 moulding plane.Attempting to weld it with mild steel rods would end in failure for anything under stress however it should MIG weld well and with specialist arc rods.

author: AndyBeez
author_rank: Frequent Contributor
timestamp: July 11, 2023, 08:56:23 am
content: Does it look forge stamped? Can you file the edge? Can you bend it after heating with a blow torch? Then it is mild steel. Which is a normal for mower blades as you do not want them to shatter when someone over runs the gravel driveway. Cost no more than $0.75 to make, even if retailed over $25.However, given the trend in certain western countries for up-cycling scrap into shabby chic crap, you could bend it, spray it pink, attach a GU10 lamp holder anddumpsell on Etsy for $250 as a #greenwashed desk lamp.
gas distributor pecularity? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: July 10, 2023, 05:22:22 am
content: I made a gas distributor for argon by drilling 1/16th inch holes every 1/4 inch into a foot of 1/4 inch brass tubing. I deburred the holes outside and scraped it inside with a rod, and plugged the end by soldering a section of rod into it. There is a row of holes, the idea was to face the tube so the holes face the bottom of the chamber and they do not blow directly at the vent.I noticed when i hook it up to an air compressor it feels like the holes at the end are blowing more then the holes in the front. I figured more gas would escape on the side it is being fed, not on the far side.Like when I run my hand across the top, it feels like the gas flow is stronger towards the far end.What causes this?Granted I will run it at a very low pressure, and it will have a mesh.. but I figured the pneumatic renaissance of the tube is such that the gas would prefer to escape closer to the inlet then further from the inlet. The tube has pressure drop and regular outlets.. so you would think it would blow more where there is less pressure drop.It's not drilled out perfectly, has a slight twist, I did not notice it twisted while I was making a layout line.Basically conceptually I thought the opposite would happen.is this some kind of fluid dynamic effect? I just imagined resistors and capacitors, like a tapped resistor to a capacitor (hole). You would think current would decrease down the length of the tube. I feel like the last few holes are blowing the most. Is this a reflection?

author: jpanhalt
author_rank: Super Contributor
timestamp: July 10, 2023, 09:05:43 am
content: Maybe it's a clarinet effect -- with sufficient flow, you may even get suction at the more proximal holes.If this has to do with back shielding for welding, I just used a channel behind the plates being welded. I also had a flow regulator for it -- neither too much nor too little is good.

author: coppercone2
author_rank: Super Contributor
timestamp: July 11, 2023, 03:27:03 am
content: oh yeah it has a channel a copper plate with holes and a mesh, I am just curious WTF the equivalent circuit is, and I plan to put it on a separate tank with a flow valve (restricted apature + ball tube)yeah if its sucking air in I guess the volume would increase so even if pressure dropped the flow would be bigger
Calculating the power of a DC shunt generator  - Page 1
Forum section: electronics / general

author: shamooooot
author_rank: Regular Contributor
timestamp: August 10, 2023, 01:30:03 pm
content: HelloHow much power a DC shunt generator can generate while driven by an induction motor:induction motor:3-phase - 400v/220v - 50Hz - 600w - 1250RPMDC GENERATOR:Excitation voltage: 0-220VDCExcitation current: 0.14A Max.output voltage: 220VDC Max.Output power: 600WMax. rotate speed: 3000rpm
langmuir probe for welding plasma study? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: June 27, 2023, 05:53:11 am
content: Has anyone experimented with langmuir probes for looking at welding arcs?https://en.wikipedia.org/wiki/Langmuir_probeI see that a balled tungsten looks suspiciously like that probe in the picture. It seems that most research is related to lower temperature plasma though, like for RF semiconductor processes.This ramps up the complexity by alot. Does anyone know about simple experiments in early books or whatever?https://iopscience.iop.org/article/10.1088/0022-3727/34/18/302/metaI imagined something like using a thin tungsten for the probe (like a EDM wire), a big tungsten for the electrode, and a water cooled copper block for the target, and battery powered circuits for probe bias.
heat straitening hammer type? dolly? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: August 09, 2023, 05:33:10 am
content: So its round 542 with the LISN chassis that warped severely (10 gauge steel).I improved the cooling on the brazing transformer, so I can get dime sized yellow hot spots on the chassis using a large electrode.But I am wondering about hammer choice for this operation. Should I be using like a peen hammer or a flat hammer. They sell a speciality hammer for straitening metal, and its basically flat.But I see a weird cooking style hammer with serrations on it advertised for shrinking. As far as I understand, the straitening and shrinking processes might be the same thing. Is this one superior? Or should I be using a flat hammer?and how about dolly?This is a buckled steel chassis bottom that is like 11 gauge steel or something that was heavily welded. I should cut it into pieces and throw it out but I wanna fix it. I put extra cooling on the resistance transformer and got some heavy electrodes because that is on the bucket list... I wanna give it one last hoorah. I see they use the process to straiten like battle ships so it must be possible to do, just damn what a dog
testing tig without torch? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: May 30, 2023, 08:22:04 am
content: Stupid question, treez styleCan you test a TIG welder to see if it will strike an arc, or at leave have any kind of electrical output under load, without the actual torch and cables?Lets say you are already under water with a stupid project you almost abandoned 15 times.If I set it to a lower current level, then say.. connect a cable to the output (bypassing the front panel connectors) that is connected to say a stainless rod, would it be safe for the welder?I don't mean something stupid with jumper cables, I mean to bolt on cables with lugs that can handle the ampacity. I just wanna see if this thing is capable of making an arc. I assume the problem might be if someone jams something into the connectors and it starts arcing in the connector and destroys it.Does the tungsten provide some kind of small resistive current limiting that protects the power source in some way? Just so I don't get stuck with more unusable stuff. Or better yet, can I see if it produces an arc with a carbon rod at the end of a cable? ( i have one already). I figure the carbon rod would limit the current to levels similar or much more so then a regular tig cable. I don't see a problem with it, but its quite a complicated machine.

author: langwadt
author_rank: Super Contributor
timestamp: May 30, 2023, 08:35:07 am
content: The welder does the current limiting. a basic tig welder is the same as a stick welder, just with the cables swapped to to the right polarity

author: coppercone2
author_rank: Super Contributor
timestamp: May 30, 2023, 03:12:42 pm
content: alright I guess I am asking if there is no minimum impedance that makes them go screwy like too short cable, too fat cable, or no tungsten.I ask because a light bulb tungsten limits current quite a bit, and it does so fast.I thought it might be a bit like a dim bulb limiter built into the circuit! My research into dim bulb limiters seems to reveal that there is nothing quite like tungsten for preventing electronics from exploding. Granted its alot thicker, but the current is alot higher too.
. - Page 1
Forum section: electronics / general

author: fullmoon6661
author_rank: Newbie
timestamp: May 23, 2023, 10:29:33 pm
content: .

author: jpanhalt
author_rank: Super Contributor
timestamp: May 23, 2023, 10:50:31 pm
content: 1100 is quite soft and has a recommended "minimum" bend radius . Anything sharper may lead to cracking. There are tables, such as this:https://www.aircraftmaterials.com/data/aluminium/1100.htmlMinimum bend depends on alloy, heat treatment, and thickness. Minimum (not optimal) bend radius is often quoted relative to thickness. Harder allows will have a radius of 6T or more (T= thickness).Simply look up your alloy and any heat treatment. 1100 is often temper-0, so there is no practical minimum radius for 1/16" thickness (0.064") according to that table.
Working mechanism of the cocking in desoldering gun pump suction - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 18, 2023, 12:18:05 am
content: How's the working mechanism of cocking on the pump suction in a Hakko desoldering gun or alike product?

author: tooki
author_rank: Super Contributor
timestamp: June 04, 2023, 04:22:48 pm
content: Wtf are you even asking?!?

author: helius
author_rank: Super Contributor
timestamp: June 04, 2023, 04:54:18 pm
content: Assuming that you really are asking about desoldering guns, they do not use cocked springs to generate suction, so there is no cocking mechanism. The suction is most often produced using a diaphragm vacuum pump. Some models instead use a venturi "ejector" to transform pressurized air into vacuum.Cocked springs are used in tools called "solder-suckers" that are manually, not electrically, operated.

author: coppercone2
author_rank: Super Contributor
timestamp: June 11, 2023, 01:08:27 am
content: I think he is asking about the pace patented slurp method where it has a higher then usual vacuum pull for a short period of time before it slows down. They 'yank' solder with a pressure pulse, supposedly. Something like overloading the pump for a half second before it slows down to a normal pull.

author: tooki
author_rank: Super Contributor
timestamp: June 11, 2023, 03:25:09 pm
content: Quote from: coppercone2 on June 11, 2023, 01:08:27 amI own a Pace desoldering station and can confirm that’s exactly how they work: they give the (12V) motor a ~24V pulse for about 1/2 second, then drop to 12V for continuous suction until released. They call it “SnapVac” IIRC.
DH-485 Interface - Page 1
Forum section: electronics / general

author: rvalente
author_rank: Frequent Contributor
timestamp: April 20, 2023, 04:13:57 pm
content: Hello Mates,needed to reprogram a PanelView 550 with a DH-485 USB interface (1749-UIC), quick inspection the USB device recognized and enumerated as prolific USB Serial bridge in COM4. DH-485 is a protocol, does anyone know if a simple USB-RS485 would work? I've had not enough time to poke around.

author: tooki
author_rank: Super Contributor
timestamp: May 01, 2023, 01:37:26 pm
content: I took 2 minutes to poke around and it looks like the answer is “no”.
air filter for tig welder? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: May 30, 2023, 01:45:32 am
content: So I gotta say, the whole concept of this welder with the conformal coating and boards exposed to the stream of grinder dust and weld fumes is just bizzare.I think they are going about this whole thing totally the wrong way. Rather then to seal it (its still a irregular surface area thats a total bastard to clean), I think the solution is to put some kind of dust filter on the thing.It should auto shut down if you forget the clean the filters.Any ideas for a low pressure drop inline filter material that can be used for the welder? I imagined a 3d printed frame with the filter pressed into it. Maybe a modified automotive cabin filter or something..I also thought to get maybe heavier gauge longer cables so the welder can be put far away from the work area. And perhaps to use my stand *modular gas torch holder* to act like a adapter, so I can have a heavy gauge cable leading to the welder, and then terminate it with a few feet of ligher gauge cable so the hand piece is not annoying.
Battery assembly (spot welding) service needed in Germany - Anyone? - Page 1
Forum section: electronics / general

author: johankj
author_rank: Contributor
timestamp: February 08, 2022, 09:39:55 am
content: Hello!I'm in need of someone who can assemble some battery-packs in Germany.Does anyone knows of a company that can do this?Thanks in advance.

author: matskatsaba
author_rank: Contributor
timestamp: March 16, 2023, 04:44:56 pm
content: Some or a LOT of battery packs?If it's not for mass production, you can find spotwelders specifically for battery packs on ebay for cheap.Like, 20 usd-ish cheap. Even with cordless, LiPo battery powered ones.

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 18, 2023, 12:13:14 am
content: if your AC-DC adapter is > 10 A max and got nickel, just make a pair copper wire each ended with sharp points then do itelse buy a best-buy quality resistance/spot welder tool set on e-commerce online
Small size metal/piecework drilling - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: February 26, 2023, 11:16:55 pm
content: How do we clamp or hold quite (very) small size dimension of a metal piece to be drilled as correctly and precisely as the large one easily clamped being so sturdy (as only have 4 inch drill vise with wide hollow in center) ?

author: thm_w
author_rank: Super Contributor
timestamp: February 27, 2023, 10:46:14 pm
content: You get a small vice, and hold it in the larger vice.If its an oddly shaped part you may need to use various strategies or a specific jig which is designed for that part.https://www.google.com/search?q=clamping+small+parts+vice

author: beanflying
author_rank: Super Contributor
timestamp: February 28, 2023, 02:13:49 am
content: Highly recommend you have a good watch of some of Stefan's videoshttps://www.youtube.com/@StefanGotteswinter/videosSome of his work is sub mm holes in hardened steel with very high degrees of accuracy.Other than that Collet chucks or custom softjaws (Lathe Chucks or Vise) are used depending on the shape.There is also some more expensive solutions including speciality jaws, vacuum or magnetic so perhaps look athttps://www.miteebite.com/orhttps://piersonworkholding.com/

author: Overspeed
author_rank: Frequent Contributor
timestamp: February 28, 2023, 05:48:29 pm
content: Hellodepend of the raw material , on metal parts gluing works nice , after drilling , acetone bath to dissolve the glue even some glue are sensitive to hot water , in jewellery they use a special waxRegardsOS

author: jpanhalt
author_rank: Super Contributor
timestamp: February 28, 2023, 05:56:59 pm
content: @OverspeedA precursor of hot melt was solid shellac sticks. Those were used by jewelers since very long ago. That is what I learned from an uncle in the early 1950's. Shellac can also be used on a faceplate for lathe work.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 01, 2023, 06:29:01 pm
content: I don't know precisely the application, but IF (and it is a very big IF) the forces involved are not too big you might consider 3d printing a special jig in two halves to hold the small thing you want to drill in to, making a jig in two halves which can be tightened together with some inserted screws and nuts to clamp the metal part.

author: matskatsaba
author_rank: Contributor
timestamp: March 16, 2023, 04:26:46 pm
content: As overspeed mentioned, CA glue the part to a larger workpiece and clamp that. Acetone or gas torch to remove.If not a one-off then it might be worthy to make a specific holder.Do avoid hotsnot.
Brother TC-215 conversion - Page 1
Forum section: electronics / general

author: matskatsaba
author_rank: Contributor
timestamp: March 16, 2023, 04:12:34 pm
content: As title says, got a TC215 tapping centre. Quite an ancient one, have to add. It's got a bunch of issues (a processor board, for example), so I was thinking about converting it to a mill with openCNC. Planning to use it with very low feed rate and cutting depth, but not really sure if the machine is designed in a way that it actually can do the milling part (I mean, X, Y axis).Anyone familiar with this model?
. - Page 1
Forum section: electronics / general

author: fullmoon6661
author_rank: Newbie
timestamp: March 01, 2023, 07:40:51 pm
content: .

author: Jackster
author_rank: Frequent Contributor
timestamp: March 01, 2023, 07:54:30 pm
content: https://www.xometry.com/https://www.protocase.com/

author: thm_w
author_rank: Super Contributor
timestamp: March 01, 2023, 09:53:29 pm
content: Would be helpful to say what country you are in.

author: beanflying
author_rank: Super Contributor
timestamp: March 02, 2023, 06:58:53 am
content: Quote from: fullmoon6661 on March 02, 2023, 01:28:22 amIt does absolutely matter, for basic manners add your Country so people can help you with better suggestions.I have a local Laser Cutter (or a Waterjet cutter if that suits the job better) and a Sheetmetal business that works with them with a Powdercoat line that does one offs but in this part of Country Victoria in Australia but almost certainly you would be best served finding a local company or companies to help you out. Listing their names or web addresses is likely useless to you as I can drop into their places for a chat to discuss a job if needed because PERSONAL RELATIONSHIPS still matter.Online only suppliers are not anywhere near as good or as convenient as you think they are.

author: Overspeed
author_rank: Frequent Contributor
timestamp: March 06, 2023, 09:19:24 am
content: HelloCountry / location is a mandatory parameter if you don't want to pay massive shipping costs / Customs taxes and also waste time to contact foreign companies which are probably not interested to make international shipment or works with foreign companies and more foreign private customers.That also possible to order laser cut sheet from one company and locate another local shop with a break press , most laser / water cut company just cut sheet and don't provided other works .RegardsOS
VHS casette case repair (foil heat sealing) - Page 1
Forum section: electronics / general

author: bodzio_stawski
author_rank: Regular Contributor
timestamp: July 10, 2021, 10:12:23 am
content: Hello, I have a question for my colleagues - cassette purists, or actually VHS cassette cases:) Has any of you ever repaired the foil for the box label? It would be nice to get at least the foil itself, which is on the VHS cases. I have one box from the collection that I would not like to replace for compositional and aesthetic reasons with another. Unless someone has one for sale.Greetings!

author: bodzio_stawski
author_rank: Regular Contributor
timestamp: August 19, 2021, 08:32:06 pm
content: Really no one can help?

author: Gyro
author_rank: Super Contributor
timestamp: August 19, 2021, 09:16:24 pm
content: It sounds pretty irreparable. Try eBay?

author: matskatsaba
author_rank: Contributor
timestamp: March 16, 2023, 04:58:07 pm
content: Well, it's super finnicky, ultra DIY, and rather an art than a procedure. Had limited success a couple of times, but it's a real pain.Transparent part was from a paper holder. Laid it out (oversized ofc) on the case, used a piece of teflon foil to avoid melting in, and used a soldering iron with a flat tip (weller,.Not talking about the white teflon tape, the teflon foil was a replaceable cover for my grill fryer.Keep in mind, that it will likely never look like original. Well, I couldn't make it pretty, just "working".
rotatable latch for keithley HV psu lid - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: February 11, 2023, 04:30:19 pm
content: The keithley PSU I have (240A) has top and bottom panels that remove via rotating a screw with a leaf on it 90 degrees. They look to be about 15 thousanths thick.What is the best material to try to bend these out of?Or something that is compatible. I don't have the plastic part either.I was thinking that bronze might be the best bet?The part manufacturer is southco. I suppose I can also just use threaded screw to hold it down by drilling some holes, but I want to investigate not mutilating the chassis more yet (already put a IEC connector on it).I think that part is actually meant to dig into the aluminum to provide a electrical connection also.
On practical convenience between thread and taper rod - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 26, 2022, 06:42:44 am
content: Which system is easier and more practical, threaded or tapered rod/shaft male-female pair in doing fastening and releasing of connection mainly between Arbor and chuck (and else connections as extra information)?

author: coppercone2
author_rank: Super Contributor
timestamp: February 09, 2023, 12:30:24 pm
content: The taper is excellent, so long you have the extraction tools, it has very little chance of binding, wheras threaded stuff can bind.

author: Benta
author_rank: Super Contributor
timestamp: February 09, 2023, 11:33:56 pm
content: Are we talking drill chucks here?For precision, nothing beats tapers (except shrinking, but that's very specialized). For ease-of-use, threaded mounts are nicer, but only work in one direction.
There's printed on a product package "light duty", so...  - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: January 07, 2023, 01:44:35 pm
content: How come there's printed on a product package "light duty" as opposed to commonly claimed "heavy duty" by other suggesting high quality product?Is the manufacturer simply humble, admits its product is standard or lower quality or what's actually the market product convention?(real case is 13 mm drill chuck)

author: bidrohini
author_rank: Regular Contributor
timestamp: January 29, 2023, 04:10:48 am
content: "Light duty" generally refers to products that are designed for occasional or infrequent use, as opposed to "heavy duty" products which are built for frequent or intensive use.The manufacturer may use the term "light duty" to accurately describe the intended usage and performance capabilities of the product, rather than making false claims about its durability or quality. Additionally, it may be a marketing strategy, lower-end products can be sold at a lower price point.In the case of a 13mm drill chuck, a "light duty" chuck may be suitable for occasional DIY projects or home repairs, while a "heavy duty" chuck would be more appropriate for professional or industrial use.

author: Overspeed
author_rank: Frequent Contributor
timestamp: January 29, 2023, 01:39:48 pm
content: Helloon drill chuck light duty is also a question of maximum torque , if you drill wood or plastic drilling torque will be lower than drilling steel and that more true when you go in big drill diameterRegardsOS

author: Doctorandus_P
author_rank: Super Contributor
timestamp: February 03, 2023, 08:14:57 pm
content: They are all completely meaningless terms slapped onto products by the marketing department and they are just guided by what they think will make them the most profits for the market they sell their product on.

author: TimFox
author_rank: Super Contributor
timestamp: February 03, 2023, 08:22:00 pm
content: Quote from: Doctorandus_P on February 03, 2023, 08:14:57 pmNo, marketing would not apply "light duty" to a drill chuck to increase profits.Instead, that term would be applied to avoid warranty claims when someone breaks the chuck by overloading it.
Need help identifying this solenoid valve - Page 1
Forum section: electronics / general

author: Yellofriend
author_rank: Regular Contributor
timestamp: January 13, 2023, 09:17:40 am
content: I am refurbishing my Chinese PicknPlace and hope somebody can give me some ideas about this valve.There are 2 piece next to each other. I presume it's 24V. The two white houses are vaccum, the black at the back is a blow hose, I presume to support part release.Because it's pretty packed I am not clear how it's connected and also unclear about the "air circuit", how it switches from vacuum to blow. In the machine the blower was constantly running. Not sure about the vacuum (machines was quite a noise source).Or is the blower to produce UP pressure for the solenoids? I don't see air connection from the push hose to the nozzles.If somebody has a datasheet of something similar would be nice.

author: bidrohini
author_rank: Regular Contributor
timestamp: January 29, 2023, 03:03:38 am
content: Can't recognise, sorry. Have you tried google images, by the way?

author: Overspeed
author_rank: Frequent Contributor
timestamp: January 29, 2023, 01:36:53 pm
content: Helloyou need to know :what Voltagewhat flow or at least fitting threadwhat pressurewhat logic as : normally close , normally open ??after some brand have on line catalogue as Festo , Bosch , SMC .... and that also possible to locate parts on Ebay after to have identify a reference .RegardsOS
What pins are used for breadboard cables? - Page 1
Forum section: electronics / general

author: Yellofriend
author_rank: Regular Contributor
timestamp: January 17, 2023, 02:58:43 am
content: What pins are used for breadboard cables?Male and female I need. No need for housing, I can shrinktube them. Right now I use XH for the female, but they a bit bulky due to the locking pin.

author: thm_w
author_rank: Super Contributor
timestamp: January 17, 2023, 10:15:06 pm
content: dupontBut I'm sure you know its cheaper to buy the pre-finished cables.https://protosupplies.com/product/2-54mm-male-pins/

author: Yellofriend
author_rank: Regular Contributor
timestamp: January 18, 2023, 05:32:03 am
content: Thanks.Dupont was the keyword.And the promiscuous girlfriend is here:https://protosupplies.com/product/2-54mm-female-pins/In China I can find them with 杜邦 (Dupont) + 2.54. And one can add 金 for gold plated if preferred.My cheap breadboard cable all sort of of oxidized. And the cable is so bad I can't strip it without cutting strands.A good page about it:https://www.mattmillman.com/info/crimpconnectors/dupont-and-dupont-connectors/
BMS module for supercapacitors? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: October 18, 2022, 01:38:46 pm
content: I Have 3 super capacitors hooked up in such a way that it would be best to put a BMS on it that has terminal blocks inside of a chassis. The capacitors are 3000F and the charge current is not chosen yet.What is a good BMS to use? It is for spot welding. I want wires that go to the caps, not the PCB that goes between them, if thats possible

author: bidrohini
author_rank: Regular Contributor
timestamp: January 05, 2023, 10:42:26 am
content: You may find this helpful. It's about supercapacitor management system:https://www.sciencedirect.com/science/article/pii/S1364032121011783
To correctly seat a motor shaft connector of B system taper - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 28, 2022, 03:47:38 pm
content: I'm noob in taper connection system so patiently me help outHow do we correctly seat a B taper connector (most commonly B12, B16, B18) into its chuck mate in such that if there's no left-handed bolt fastening axially in center it's still quite viable and reliable?it's just a press by our muscled hand, put weigh on top of connector after insertion, hit it gently or etc ?Thanks much in advance

author: Gyro
author_rank: Super Contributor
timestamp: January 03, 2023, 10:48:42 am
content: It's normal to give the chuck (jaws retracted) a tap with a wooden mallet to fully seat it.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: January 04, 2023, 10:31:17 pm
content: Normally the taper should hold just on the taper and a whack. You can give it a bit extra by putting the taper in the fridge first and heating the chuck on somethig warm (but not too hot).If either of the faces is worn or damaged, first remove any burs, and maybe add a dab of loctite, but it should not be needed in normal circumstances.
Urgent contact moderator - Page 1
Forum section: electronics / general

author: crouchorama
author_rank: Newbie
timestamp: January 08, 2023, 12:55:43 am
content: HelpI mistakenly put my email address into my user name and I need to contact the moderators to try to correct it.thanks

author: Andy Watson
author_rank: Super Contributor
timestamp: January 08, 2023, 01:31:51 am
content: Report yourself. There's a link in the bottom right corner to "report to moderator".

author: gnif
author_rank: Unknown
timestamp: January 08, 2023, 02:20:03 am
content: Done, you will also need to reset your password on your first login.

author: bidrohini
author_rank: Regular Contributor
timestamp: January 21, 2023, 07:41:30 am
content: Looks like it is fixed now.
On thrust bearing naturally performs radial bearing  - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 25, 2022, 08:27:36 am
content: Sorry if it's really mechanical, not electrical, engineering at allIsn't a thrust bearing, as a matter of course, performing a radial bearing work ?(after inspection on a hand size DC/AC electric motor)

author: Ian.M
author_rank: Super Contributor
timestamp: December 25, 2022, 09:31:02 am
content: All 'Thrust Bearing' means, is a bearing optimised for or intended for axial loads, usually unidirectional. It may or may not have a lesser capability for radial loads, depending on its design and construction. e.g. a ball thrust bearing with grooved races can act as a (poor) angular contact bearing and resist radial loads up to a small fraction of the applied axial load, but a roller thrust bearing with flat races will rapidly be damaged by even small radial loads.

author: wraper
author_rank: Unknown
timestamp: December 25, 2022, 09:42:39 am
content: On radial load thrust ball bearing performs no better than normal ball bearing for axial loads.

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 25, 2022, 10:28:46 am
content: Quote from: abdulbadii on December 25, 2022, 08:27:36 amshow the picture of you motor and gearing/linkage involved, then we can talk same dictionary. some bearing only radial, some only thrust/axial, but some at an angle, can do both.https://en.wikipedia.org/wiki/Thrust_bearing

author: jpanhalt
author_rank: Super Contributor
timestamp: December 25, 2022, 11:10:28 am
content: The simple answer is no, a thrust bearing is not by default a radial bearing. If the thrust bearing is made with balls instead of rollers, then it may take a radial load depending on how it is made. However, the nature of a thrust bearing means that it may not take any radial load at all (see attached image).In my experience thickness of a thrust bearing is important. That is, you want them as thin as practical for the load.

author: Benta
author_rank: Super Contributor
timestamp: December 25, 2022, 09:05:21 pm
content: There's a reason that for ecample lathe live centers are made as they are.Here you go, I think it answers your question:https://www.roehm.biz/en/products/live-centers/live-centers/

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 26, 2022, 06:17:56 am
content: Quote from: abdulbadii on December 25, 2022, 08:27:36 amSo just been browsing over many threads under this category of forum, now Imho.EEVBlog electronics community forumis deserved to becomeEEVBlog electronics, mechanical and industrial engineering community forumas some of its categories are really not merely electronics stuffs, to which I'll be moving up from many Physics/mechanical forums I've been in, and not as active and useful as thisThanks a lot to all for the truth given which'd help solve the problem !
Small motor shaft adapter/connector confusing shape - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 17, 2022, 01:55:38 am
content: I've thought a good use on and tried to buy a uncommon motor shaft adapter/connector but halted on its confusing shapeIt's uncommon shaft as it's to yield thread M6, smaller diameter 6 mm than the most common M10, 10 mm which is ~ 3/8", adapterBut, Imho, it has indented part "in wrong location"So what's the function of the two indented parts as both are really positioned rather opposite direction to the most common M10 adapter (mostly of motor shaft 5, 6, 10, 12 mm etc) which positions these both near at the other end, at the base of the M10 thread, functioning to place a spacer ring more tightened?Please logically and usefully explain

author: Infraviolet
author_rank: Super Contributor
timestamp: December 18, 2022, 12:02:59 am
content: I can't quite decipher the wording of your post, but I'll make some guesses about the image:Those adapters seem to be designed to let an M6 sized nut (or thing with an M6 taped hole in it, screw on to one end, then in the other end is a cyclindrical hole to take a circular profile or D shaped shaft. The side hole, or there might be two side holes from opposite directions, is(/are) tapped to take grub screws which can be tightened to clamp the shaft so it won't turn separately from the adapter. I'd think it rather odd to use this sort of an adapter on a motor shaft though, because if the motor is turning in a particular direction than torques from the inertia of whatever it is trying to run will end up unscrewing whatever one has screwed on to the M6 end. So I'd think this adapter is only suitable for things like say a drill bit or a fan which only ever turn in one direction, no use for a wheel which might have to go backward or forward.Mostly I'd think this adapter more suitable as a way to get a threaded tip on an otherwise plain round bar, for some sort of minor static structural elements within equipment, than as anything for a rotating shaft.Those flats on the outside of the adapter might also let it serve as a double flatted "D" type shaft which something with a rather wider hole could fit on to from the outside.6mm D shafts are, by the way, quite common on a lot of DC, BLDC and stepper motors.
How to make Continuous Interpolation? - Page 1
Forum section: electronics / general

author: flowchartx
author_rank: Newbie
timestamp: February 10, 2023, 05:30:07 am
content: Hello everyone,I control 2 motor with microprocessor. I wrote an interpolation algorithm with the slope formula of the line. But motors stop every point.Is there an algorithm you can suggest for continuous interpolation?
A hammering machine/drill working mechanism - Page 1
Forum section: electronics / general

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 09, 2022, 11:31:32 am
content: How does the hammering machine/drill mechanism work (please explain elaborately with few decent illustrations) ?

author: jpanhalt
author_rank: Super Contributor
timestamp: December 09, 2022, 11:47:06 am
content: There are extensive descriptions on the internet. Here's one:https://www.protoolreviews.com/rotary-hammer-vs-hammer-drill/#:~:text=A%20hammer%20drill%20is%20simply,a%20vibration%20against%20each%20other.First step, you need to refine your question: hammer drill, rotary hammer drill, or impact drill? Impact drilling is like in the olden days when you used a star chisel and hammer to drill into concrete. The mechanism was simple. You hit the chisel with a hammer, rotated it a one eight turn (approximately) and hit again. Repeat until you had a hole. If you are only drilling a few holes in soft concretious materials like mortar, you can use a carbide concrete drill in an ordinary variable speed hand drill.

author: vk6zgo
author_rank: Super Contributor
timestamp: December 09, 2022, 11:48:25 am
content: Quote from: abdulbadii on December 09, 2022, 11:31:32 amThis might help:https://www.protoolreviews.com/rotary-hammer-vs-hammer-drill/#:

author: Doctorandus_P
author_rank: Super Contributor
timestamp: December 09, 2022, 04:21:11 pm
content: Just search a bit around on youtube.They have teardowns of about all sorts of tools available on the market.
Miniature slip ring bearing - Page 1
Forum section: electronics / general

author: Zbig
author_rank: Frequent Contributor
timestamp: December 06, 2022, 02:20:22 pm
content: HiDoes anybody know what type of bearing the miniature slip rings of this or similar type:https://www.aliexpress.com/item/32944388596.htmluse? What I mean is could the rotor in these things be relied upon for load-bearing duties in a project? I'm talking a mass similar to a small web cam here suspended on proper ball bearing on one side and this kind of slip ring on the other. Or is it necessary to provide your own independent bearing for the structure?

author: Ian.M
author_rank: Super Contributor
timestamp: December 06, 2022, 02:50:11 pm
content: I'd bet on it *NOT* having a proper bearing as if it did, in most applications it would over-constrain the rotating part unless it was flexibly mounted.

author: bugrobotics
author_rank: Regular Contributor
timestamp: December 06, 2022, 04:35:02 pm
content: Quote from: Zbig on December 06, 2022, 02:20:22 pmNo, the units you linked are not going to have bearings suitable for load bearing applications. You will want to design in a separate bearing.

author: Jackster
author_rank: Frequent Contributor
timestamp: December 06, 2022, 06:46:41 pm
content: Not an expert but I have delt with these with a project, granted mine were £50-150 each and made from metal but I have a few of these cheaper smaller ones too and they are made up the same.You can not use them in any way that puts a load on them. They are designed to go inside a bearing or a motor.The plastic ones are two bodies of plastic with a plastic core holding then together. The internal contacts run on a brass rings on top of this plastic core.Pretty sure it is PTFE plastic inside so it runs smooth.

author: Zbig
author_rank: Frequent Contributor
timestamp: December 06, 2022, 08:54:09 pm
content: Thank you everyone. It's settled, then: proper ball bearings from both sides it is.

author: beanflying
author_rank: Super Contributor
timestamp: December 08, 2022, 09:58:55 am
content: I little different to the one you linked but I did a chop up and closer look into one a few years ago and it had double BB's in it.https://www.eevblog.com/forum/projects/slip-ring/msg2778088/#msg2778088Same seller has what look identical to this one just a few sizes larger.
SOLVED: Interfacing Arduino to 0-10v industrial motor controller - Page 1
Forum section: electronics / general

author: daxliniere
author_rank: Regular Contributor
timestamp: October 24, 2022, 06:13:33 pm
content: Hey everyone,I was hoping for some advice on interfacing an Arduino/etc with a PWM motor speed controller. The unit has input pins for 0-10v and also a potentiometer for manual control.I have no need for manual control and have found that there are ground and +10v available at the pins.How would I go about interfacing that 0-10v input with an Arduino, given that there is already 10v available and that the pot is simply acting as a voltage divider? If it could be done with a transistor as I probably have something on-hand, that would be awesome, but if not I'm thinking that a digital potentiometer IC (with SPI or I2C interface) would be the next easiest way, but I'd have to order one.If digital potentiometer is the solution, does it need to be 4k7 to match the original pot or would a 10k do the job?Thanks for reading this far and thanks in advance for any assistance.All the best!Dax.

author: pcprogrammer
author_rank: Super Contributor
timestamp: October 24, 2022, 07:06:13 pm
content: You can make an analog voltage with the arduino by using PWM and amplify it to the 0-10V range. Can be done with a transistor, but an opamp is probably better.

author: daxliniere
author_rank: Regular Contributor
timestamp: October 24, 2022, 07:25:06 pm
content: Gah! There's a solution for £4 delivered.http://www.icstation.com/voltage-converter-module-adjustable-converter-power-module-digital-analog-signal-p-12498.html?aid=372
RS232 readout on cheap DRO? - Page 1
Forum section: electronics / general

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: October 06, 2022, 07:47:41 pm
content: I have a cheap DRO "SNS-2V", is has an RS232 port but I can't seem to get any response from it. Also couldn't find anything in the manual besides how to set the baud rate. Has anyone used RS232 port on one of these? What are the typical settings and commands?

author: thm_w
author_rank: Super Contributor
timestamp: October 17, 2022, 11:34:00 pm
content: Send every character to it yet? Some other manuals state to send STX.Take it apart and look at the board to make sure its populated?Put a scope on the Tx line?

author: ledtester
author_rank: Super Contributor
timestamp: October 17, 2022, 11:46:35 pm
content: I found this manual:https://www.trabiss-int.com/wp-content/uploads/2018/12/DS-2V-and-DS-3V-English-instructions.pdfwhich appears to be the manual for this aliexpress listing:https://www.aliexpress.us/item/2251832719664379.htmlNote the similarity of the user manual cover:On page 12 there instructions for setting the RS232 baud rate.Don't know if this manual is the one for your model, but it looks like it might be.

author: thm_w
author_rank: Super Contributor
timestamp: October 18, 2022, 12:57:16 am
content: Yeah OP said they found how to change baud. Nothing else in there about printing out info.Actually, any chance they are using the wrong cable and need a null-modem cable? seems unlikely though, most cables are standard M-F or whatever.

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: October 18, 2022, 01:15:42 am
content: Yes, that manual online matches more or less the printed manual that I have, and I can change the baud rate. I tried sending a few random characters, but not STX. Will try that magic word. Also will try to trace the wires to be sure which one is T and which is R.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: October 22, 2022, 10:27:09 am
content: What is the end goal you want to achieve with this?A reminder that the glass rulers that connect to a box like this produce simple quadrature signals and are easy to interface, especially if you use a microcontroller with integrated quadrature hardware.Software examples are also common, as the same signals are used extensively from simple manual rotary encoders (such as oscilloscope and power supply knobs) and encoder disks on all sorts of motors.