Automatic Paste Dispenser - Page 1
Forum section: electronics / general

author: vl400
author_rank: Regular Contributor
timestamp: November 11, 2011, 05:11:16 am
content: After seeing the thread on the manual paste dispenser (https://www.eevblog.com/forum/index.php?topic=5435.0) I opened up the automatic version and took some pics to compare with. Overall a very similar unit and works pretty much the same. Main difference really is this has continuous timed shots with inter delay. The 4 DIP switches on the back set the mode of operation and the time functions are set with BCD rotary switches on the front panel. The main processor is a Atmel AT89S51 running at 6MHz.

author: kripton2035
author_rank: Super Contributor
timestamp: November 11, 2011, 08:47:20 am
content: I'm looking for a thing like that, but with the air pump inside...doest it exists (at hobby prices ...) ?thanks.

author: metalphreak
author_rank: Frequent Contributor
timestamp: November 11, 2011, 10:47:41 am
content: You need high pressure air to operate these. Those little air pumps they use in hot air stations aren't powerful enough. Regular compressors aren't that expensive anyway. The one I bough cost about $130AUD and came with a bunch of accessories. I've seen the units by themselves for as low as $80.http://www.bunnings.com.au/products_product_air-compressor-24-litre-20hp_3229.aspx

author: hacklordsniper
author_rank: Frequent Contributor
timestamp: November 11, 2011, 11:29:28 am
content: Quote from: metalphreak on November 11, 2011, 10:47:41 amI bought one for 100 $ (i was amazed how cheap it was) on sale here and spent another 100 $ on the moisture remover and oiler.http://hacklordsniper.com/Slike_projekata/Projekt_(1)/Radna%20soba/Slika%20(12).JPG. These compressors are loud enogh for head to hurt very fast.However i regret the purchase because later i recieved a offer from from other supplier for 125 $ for a 8 L, super silent compressor with 2 bottles (2x4 L) and moisture remover and oiler installed. I think it would be much better choice for a lab

author: kripton2035
author_rank: Super Contributor
timestamp: November 11, 2011, 12:20:20 pm
content: Quote from: metalphreak on November 11, 2011, 10:47:41 amhow much pressure and liter/minute do you need to operate a paste dispenser like this ?

author: metalphreak
author_rank: Frequent Contributor
timestamp: November 11, 2011, 01:39:38 pm
content: I run mine at around 50psi so you would want a compressor that can achieve something higher than this. You also want one with a tank rather than a directly connected one (usually meant for inflating tyres). You might be able to use one of those small airbrushing compressors, but they have tiny tanks which means they will be constantly turning on and off to replenish the air pressure in the tank. I'm also not sure how quiet those are and all the prices i've seen have been more expensive. My compressor has a 21L tank, and a 2.5hp motor good for 95 litres per minute airflow. Takes about 2-3 minutes to completely fill from empty, and will turn itself on for ~30secs when the pressure drops too low which is about 10mins of working. Solder dispenser will still work for a fair while longer if the compressor is turned off, as the compressor fills the tank to ~120psi (turns back on at 100?) and I only need ~50.If I'm doing a lot of work, I just use a 20m air hose, and leave the noisy thing in the garageAnd yes, you *will* need an inline air drier/moisture remover. Mine cost ~$15. It will remove any oil that's been leftover in the tank as well as water vapour from the intake air that has condensed.If you are going to buy a proper compressor, get one with the biggest tank you can afford. I regret not getting the 40L model which wasn't that much more expensive.

author: kripton2035
author_rank: Super Contributor
timestamp: November 11, 2011, 02:36:54 pm
content: I already have a 100L compressor, and yes this noisy thing is in the garage...but I would like to have a small pump like my hot desoldier and hot air station in the labgarage is more than 20 meters away from the lab ...

author: robrenz
author_rank: Super Contributor
timestamp: December 16, 2011, 12:26:45 am
content: Quote from: vl400 on November 11, 2011, 05:11:16 amvl400,I bought one on EBay from hong kong that looks almost identical to your unit. ($154.00usd + $46.00usd for Air shipping (only shipping they offered) arrived in 9 days from order) The processor board looks identical but mine does not have that auxiliary board that is wire tied to the hoses and the pressure gage and vacuum/hose connection positions are swapped. I could see where they had removed some original markings from the unit but I could see the "983A dispensing controller" halo if i got the lighting just right. When I googled that number I found places in china that sell it for $116.00usd & free shipping.Do your instructions have the settings for the dip switch in the back? I cant read Chinese. I asked the seller for a English translation if they want positive feedback but I don't know how long that may take if ever. If you do, would you mind posting a picture of those settings?Thanks, robrenz

author: vl400
author_rank: Regular Contributor
timestamp: December 17, 2011, 10:03:21 am
content: Yeah you can get them pretty cheap, I payed similar to what you did and it arrived in around a week so didnt really worry about it. Works really well tooHere are the instructions for the DIP switches..

author: robrenz
author_rank: Super Contributor
timestamp: December 17, 2011, 03:34:58 pm
content: vl400,Thanks a lot, the reply I got back from the seller was less inteligible than the original instructionsThanks again, robrenz

author: robrenz
author_rank: Super Contributor
timestamp: December 23, 2011, 02:50:04 am
content: vl400,This translationmayapply to your unit.https://www.eevblog.com/forum/index.php?topic=5966.0robrenz

author: JoeyP
author_rank: Frequent Contributor
timestamp: December 23, 2011, 11:12:49 pm
content: I have a dispenser that's very similar but not identical. It does need fairly high pressure, but very little volume as long as you adjust the "suck back" control properly. I use it with one of those portable compressed air tanks (without the built-in compressor). I just refill it once in a while from the compressor in my garage. Lasts quite a while on a refill, and it's much nicer than listening to a compressor while you work.

author: metalphreak
author_rank: Frequent Contributor
timestamp: December 24, 2011, 03:51:19 pm
content: Quote from: JoeyP on December 23, 2011, 11:12:49 pmI have looked *everywhere* for a portable tank in Australia, and all the prices are expensive. I can get another entire compressor and just use the tank off it for a cheaper price!

author: mike_58
author_rank: Regular Contributor
timestamp: September 24, 2015, 07:27:30 pm
content: Easy way here -http://www.ebay.com/itm/271979673060?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649and video :

author: KL27x
author_rank: Super Contributor
timestamp: September 24, 2015, 07:45:47 pm
content: QuoteI've never done it. But my standalone air tank doesn't have a water drain valve. A propane tank has a blowoff valve in it, and it is good for more pressure than a regular air compressor makes. Unless a propane tank has lower rust resistance, I don't see why this isn't a perfectly good air tank.This guy takes it the next step and coats the inside with rust protection. Then he pressure tests to over 350 psi!