Old 12-25-2014, 04:57 AM #33
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Default Re: $90 Laser Engraver Kit?

Cool
What's the cutting engraving plate like? Just a piece of acrylic you set your object on?
I say go for designing a driver for other diodes. I know when I get one I won't be keeping that little 405. I will probably have one of the forum machinist make a better heat sink and mount as well.

I guess the Chinese finally found a use for all the diodeless disk drives they have


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Old 12-25-2014, 08:28 PM #34
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Default Re: $90 Laser Engraver Kit?

That actually looks pretty cool. Any chance you could post a video of it working? EDIT: Nevermind. I just saw they have some videos posted from a slightly different model. http://www.banggood.com/300mW-Mini-D...-p-958368.html

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And it's pretty cool

It's monochrome, and it's not super fast, but it's very very fun to use. No assembly instructions, so it really was a "DIY" experience, but once the device was assembled, it just worked. Period. No real hiccups. The software is pretty good, and took literally 30 seconds to figure out.



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Old 12-25-2014, 09:28 PM #35
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Default Re: $90 Laser Engraver Kit?

Let the driver and modding begin! Mu ha ha !!!!!!!!!!!!!!!!!!!
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Old 12-25-2014, 09:47 PM #36
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Default Re: $90 Laser Engraver Kit?

Good news / bad news.

The bad news is that I drove this thing all night long, and the output power is now no longer capable of doing decent prints. I'm not entirely sure what the culprit is, but considering that this is entirely powered by my laptop usb ports, it might be an easy fix. It might not. The diode may be damaged.

The good news, it's that it turns out that I already have the driver designed and working, I just didn't realize it!

When I made my 445-enable RC helicopter, it was the exact same challenge, ie, use a low current channel to trigger an independently powered laser driver. I still have some parts and PCBs, so I'll give that a shot.
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Old 12-25-2014, 09:47 PM #37
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Default Re: $90 Laser Engraver Kit?

Is there any way you could get the diode to be contsantly on with the software then disconect the module, turn it sideways and LPM it?
unless its not worth the hassle...

EDIT: scratch what i said above, we posted at the same time! sounds like no trouble fixing whatever has been damaged for you rhd!
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Old 12-25-2014, 10:20 PM #38
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Default Re: $90 Laser Engraver Kit?

Would it be too difficult to run it from an external source, while still usinf the USB for the signal input?
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Old 12-25-2014, 10:31 PM #39
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Default Re: $90 Laser Engraver Kit?

Quote:
Originally Posted by RYDorDIE278 View Post
Is there any way you could get the diode to be contsantly on with the software then disconect the module, turn it sideways and LPM it?
unless its not worth the hassle...

EDIT: scratch what i said above, we posted at the same time! sounds like no trouble fixing whatever has been damaged for you rhd!
Nope, not hard at all. The software has a button to just turn on the laser (necessary for focusing). Unfortunately, I'm already sold on reflowing a new board and setting up a 9mm 446

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Would it be too difficult to run it from an external source, while still usinf the USB for the signal input?
Nope, that's exactly what I'm going to do (but with a more powerful diode and driver). Will report back. It'll take me an hour or so to put together.
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Old 12-25-2014, 11:30 PM #40
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Default Re: $90 Laser Engraver Kit?

Too bad the arent grayscale...although I am more interested in cutting balsa and thin plastics so I suppose it doesn't really matter. And for 90$, theres really nothing to complain about.
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Old 12-26-2014, 05:12 AM #41
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Default Re: $90 Laser Engraver Kit?

I have it running with a 2W 445 now.

What I find strange is that it draws lines with individual points, rather than turning the laser on and moving it without turning off the laser until hitting the end of the line.

Is that normal for a laser CNC ?
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Old 12-26-2014, 05:30 AM #42
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Default Re: $90 Laser Engraver Kit?

What do you mean? Is it just a slow step/sec rate, or what? I dont know what you mean by "draws lines with individual points," but yes, normal CNC's move in move from one end point to the other in a line, not a bunch of stops in between (if thats what you mean).

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Old 12-26-2014, 06:21 AM #43
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Default Re: $90 Laser Engraver Kit?

Quote:
Originally Posted by crazyspaz View Post
What do you mean? Is it just a slow step/sec rate, or what? I dont know what you mean by "draws lines with individual points," but yes, normal CNC's move in move from one end point to the other in a line, not a bunch of stops in between (if thats what you mean).
Picture a line. Instead of turning the laser on and moving down the line, it splits the line into dots, and pulses then moves then pulses then moves, etc.

EDIT: It's a lot more fun with a 2W diode. Here's a quick video.

http://youtu.be/VGu1HdQ0Wj0


You can actually almost get away with no heatsinking given the fact that the duty cycle is actually very minimal with the laser being OFF so often. The fan I've added is more than enough cooling. It doesn't even get warm, even with a 2W 445.
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Old 12-26-2014, 01:33 PM #44
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Default Re: $90 Laser Engraver Kit?

yea thats not how normal CNC's work. Thats actually rather annoying, especially if you want smooth, straight lines. Good for making solder paste stencils out of kapton/mylar, I guess, but maybe not so much for actual cutting.
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Old 12-26-2014, 05:34 PM #45
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Default Re: $90 Laser Engraver Kit?

Quote:
Originally Posted by crazyspaz View Post
yea thats not how normal CNC's work. Thats actually rather annoying, especially if you want smooth, straight lines. Good for making solder paste stencils out of kapton/mylar, I guess, but maybe not so much for actual cutting.
I wonder if it only works that way when using an image as the input. I haven't tried the GCODE yet. Does anyone have some GCODE for a basic line that they could send me?
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Old 12-26-2014, 07:42 PM #46
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Default Re: $90 Laser Engraver Kit?

The big CO2 CNC units here in Clear Lake start at about 1KW to pierce then drop to about 750 Watts and cut the steel with a continuous motion. Pulsing is only done for etching.
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Old 12-26-2014, 08:45 PM #47
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Default Re: $90 Laser Engraver Kit?

Correction:

On image mode, it does individual pulses. On GCODE (actually, it calls it "NC"), it does nice fluid movement.

Anyone have a suggestion for a free, Windows based program that generates NC / GCODE from images?
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Old 12-26-2014, 11:28 PM #48
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Default Re: $90 Laser Engraver Kit?

Check out this site: GCODE Generators - ReplicatorG

Loads of g-code generators for basically everything. Surely one will work.
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