NEJE DK-5 Pro-5 Laser Engraver/Cutter for $69.89 - Page 1
Forum section: electronics / general

author: smching
author_rank: Contributor
timestamp: December 23, 2015, 12:48:49 pm
content: I get this laser engraver two weeks ago, it can be used to engrave various materials such as hard wood, plastic, bamboo, rubber, leather, cut paper and so on.Here is a link where you can buy it:http://www.gearbest.com/3d-printers-3d-printer-kits/pp_242557.htmlHere is a video on how to use the laser engraver:Additional documentation can be found here:http://ediy.com.my/index.php/blog/item/134-neje-dk-5-pro-5-500mw-laser-engraver-cutter

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: December 23, 2015, 12:56:55 pm
content: The art of recycling. Looks like it's based on a DVD/BD drive.

author: bitslice
author_rank: Frequent Contributor
timestamp: December 23, 2015, 02:01:36 pm
content: I've no idea why anyone would want to engrave bits of wood,but add a UV laser and I presume someone could print onto UV sensitive PCB film?so I was wondering if anyone had any info on this method of productionand they are quite cheap now, £79 for thishttp://www.banggood.com/300mW-Mini-DIY-Laser-Engraving-Machine-Picture-Logo-CNC-Laser-Printer-p-958368.html

author: matseng
author_rank: Frequent Contributor
timestamp: December 23, 2015, 02:07:43 pm
content: Quote from: bitslice on December 23, 2015, 02:01:36 pmHm... The site says £95 for me... :-(

author: bitslice
author_rank: Frequent Contributor
timestamp: December 23, 2015, 02:24:05 pm
content: ^ it's one of those email offers, if anyone is interested I can include the original link which discounts the price, but I just doubted anyone would buy one unless its ability to make PCBs was confirmed.

author: tggzzz
author_rank: Super Contributor
timestamp: December 23, 2015, 02:54:38 pm
content: Any accidental reflection could blind an innocent passerby. I don't care what someone does with their own eyesight, but maiming someone else is inexcusible. If someone did that to me then, before committing suicide, I would do everything in my power to ensure they did not reproduce. (I've explained why elsewhere on this forum).Professionals working with lasers have it drummed into them that powerful lasers (such as this) are dangerous. e.g. by watching what happens to an (anaesthetised) primate's face (and typically then vomiting), and remembering the motto "do not look into laser beam withremainingeye".Think, and consider the cumulative effects of specular reflections, >=500mW lasers, and eye safety limits below 5mW. Hint: that's only 1% of the laser's output.

author: smching
author_rank: Contributor
timestamp: December 23, 2015, 02:58:15 pm
content: Quote from: bitslice on December 23, 2015, 02:01:36 pmIt is much more difficult to carving a tiny object comparing to carving a bigger object. The video shows only the difficult part of engraving.I don't know what is the purpose of violet light laser engraving, is it possible to print onto UV sensitive PCB film?The site says US$139.00 from my country? it is about £93.50.The price is higher but you get only 300mW

author: neslekkim
author_rank: Super Contributor
timestamp: December 23, 2015, 08:24:18 pm
content: Quote from: smching on December 23, 2015, 12:48:49 pmHave you used it yourself?

author: smching
author_rank: Contributor
timestamp: December 24, 2015, 02:23:53 am
content: Quote from: neslekkim on December 23, 2015, 08:24:18 pmYes, I have tested it personally.

author: tggzzz
author_rank: Super Contributor
timestamp: December 24, 2015, 09:42:05 am
content: Quote from: smching on December 24, 2015, 02:23:53 amSo, what is your assessment? Note that this section is "Other Equipment & Products - Product reviews, teardowns, and discussion...". Your original post is no more than an advert.Make sure you discuss the safety features that ensure it cannot blind you nor someone passing by. Don't limit your answer to normal operation, include descriptions of why it is (or isn't) safe in fault modes - e.g. controller failure, power supply glitch when it is nominally turned off.

author: neslekkim
author_rank: Super Contributor
timestamp: December 24, 2015, 03:00:20 pm
content: It was $65 yesterday, $95 today..

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 24, 2015, 10:08:36 pm
content: Well they do supply a pair ofsafetysun glasses, so that's OK then...As the beam is focussed down to a spot, a specular reflection at any sensible distance would probably diverge enough to limit power density. Probably...Might be interesting to strap a bunch of lasers together to burn multiple sections at once to increase working area and speed, though alignment might be a challenge.

author: smching
author_rank: Contributor
timestamp: December 25, 2015, 12:11:35 pm
content: Quote from: neslekkim on December 24, 2015, 03:00:20 pmOh my god.Price have increased from $69.89 to $94.67

author: Deathwish
author_rank: Unknown
timestamp: December 25, 2015, 12:16:38 pm
content: Quote from: smching on December 25, 2015, 12:11:35 pmwell you all did mention it on here, what did you expect !

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 25, 2015, 12:20:58 pm
content: What would be even neater is if they'd done it without having to take the laser out of the DVD mechanism...

author: PeterL
author_rank: Regular Contributor
timestamp: February 15, 2016, 08:39:01 pm
content: Any comments on this one?:http://www.banggood.com/2500mW-A3-30x40cm-Desktop-DIY-Violet-Laser-Engraver-Picture-CNC-Printer-Assembling-Kits-p-1003863.htmlSeems like a nice kit to get started with both a XY-cnc table and laser engraving.But a 2.5 Watt laser kinda scares me. Maybe I shouldn't even advertise this link, but I wonder what you have to say about this..

author: tggzzz
author_rank: Super Contributor
timestamp: February 15, 2016, 08:43:40 pm
content: Quote from: PeterL on February 15, 2016, 08:39:01 pmGood. It should scare you and, much more importantly, anyone nearby.Specular reflections are killers: they blind people and then the person commits suicide. I would.

author: m98
author_rank: Frequent Contributor
timestamp: February 15, 2016, 09:56:01 pm
content: Quote from: tggzzz on February 15, 2016, 08:43:40 pmOk, everyone has their own opinion, it seems...Btw, why not simply put a opaque box over the machine while running? Combine that with a switch in series with the power supply which detects if the box is in place.But sure there are too many idiots (even in universities physics departments...) who have no clue about laser safety.

author: tggzzz
author_rank: Super Contributor
timestamp: February 15, 2016, 10:17:11 pm
content: Quote from: m98 on February 15, 2016, 09:56:01 pmI'm deaf; if I was blinded as well, then life would be pretty suboptimal. What would you do if you were deaf and blind?QuoteProvided there is no failure mechanism by which the beam could escape and there is no way of defeating the mechanism, that's fine.All too often idiots think about buying a >400mW laser on ebay - and using it without taking precautions. I don't care what they do to their body: it is just "evolution in action". I do care that their idiotic ignorance might hurt other people.

author: chris_leyson
author_rank: Super Contributor
timestamp: February 15, 2016, 10:34:08 pm
content: A 500mW laser and a pair sun glasses,Sun glasses are never laser safe, stick it under a cover before you blind yourself or some one else. I use laser safety glasses with an OD of 6 or 7.

author: m98
author_rank: Frequent Contributor
timestamp: February 16, 2016, 08:15:52 am
content: Quote from: tggzzz on February 15, 2016, 10:17:11 pmWell, if someone first builds a safety mechanism just to defeat it afterwards, i'd count them to the idiot fraction. Constructing a box where no light can escape isn't that complicated. We're talking about hobbyists, when you know that there is something dangerous going on inside the box, you'll try your best so it doesn't has to prove it's fail-safety.And as I said, too many people who have no clue about laser-safety. There'll always be idiots who endanger themselves and their environment by "just playing around" with lasers. And there'll always be companies who target exactly that market, by selling class 4 laser pointers for example.

author: PeterL
author_rank: Regular Contributor
timestamp: February 16, 2016, 09:14:00 am
content: Quote from: m98 on February 16, 2016, 08:15:52 amA short search on youtube makes you realize that a lot of these lasers end up in the hands of idiots. And I suspect this is just the beginning.In this case it is sold as a cool hobby tool, and as such a wonder how useful it actually is.But you know this thing will be bought by people who don't have a clue of how dangerous this could be if used improperly.

author: mrpackethead
author_rank: Super Contributor
timestamp: February 16, 2016, 09:22:12 am
content: IF you search aliexpress, you'll find some much less whimpy versions of the laser! 5000mW.http://www.aliexpress.com/item/5500mW-A3-30x40cm-Desktop-DIY-Violet-Laser-Engraver-Picture-CNC-Printer-Assembling-Kits-BG44/32598986836.html?spm=2114.01010208.8.28.4MXOyo

author: tggzzz
author_rank: Super Contributor
timestamp: February 16, 2016, 09:52:20 am
content: Quote from: m98 on February 16, 2016, 08:15:52 amAnd what about a child or other third party that happens to be in the same room?QuoteHow many people on this forum have picked up a soldering iron by the wrong end? Most, I would expect. It only takes one second while thinking of something elseBuilding a box that has no gaps even when slightly misaligned or warped after misuse isn't perfectly simple. Specular reflection through small gaps can blind.QuoteYes

author: m98
author_rank: Frequent Contributor
timestamp: February 16, 2016, 03:25:54 pm
content: Quote from: tggzzz on February 16, 2016, 09:52:20 amThe same situation as if you where working with a chainsaw, everyone who's around should be aware of what's going on. So no children/intoxicated people/uninstructed people allowed in the room. Curtains closed and in doubt door locked, of course.Quote from: tggzzz on February 16, 2016, 09:52:20 amSimple: Always put it back to the stand while doing anything else than making a solder joint. Ok, maybe it'll get me sometime...Quote from: tggzzz on February 16, 2016, 09:52:20 amIt's not totally simple to get it entirely light-proof*, but it's certainly easy enough to avoid any directly reflected light to leave a box.*As far as my experience with building large format pinhole cameras goes...

author: tggzzz
author_rank: Super Contributor
timestamp: February 16, 2016, 07:04:59 pm
content: Quote from: m98 on February 16, 2016, 03:25:54 pmThat's directly relevent practical experience. Unfortunately most of the "lets see what I can do with this laser" brigade won't have such experience.