That's a great idea. For small boards possilby a CD drive hack would do. Would take some code to convert the cartesian data to polar data. One could possible...
... The polygon mirror concept sounds more difficult to implement. How about a large diameter disc with a laser diode mounted on the perimeter. The PCB moves...
Hello Dave, There are some poor man's method for the power measurement check Sam's Laser, so many information exist. I'm always using goggles during tests....
The tricky bit is keeping the exposure times reasonably equal. The disk would have to speed up as the laser approaches the center line. Nice idea though... Les...
Henry, I will have to look at the bmp to raster path. I haven't played with Mach all that much so I don't know how it imports a raster. Do you run the raster...
... I wonder if instead of trying to do cartesian scans, put the board on some sort of a spinning disk and run the laser in a radial direction or a polar scan....
... ... One difficulty that I have worried about using diode lasers is focusing and power measurement. I don't have any tools that are specifically useful for...
I think it'd be way less work to just export gerber as BMP and raster scan. Mach3 has raster scan capability from a bmp. Easy solution. ... [Non-text portions...
... No, but I think if the intensity causes polymerisation under 30 seconds or so then it is linear. (i.e exposure time = 1/intensity). I discovered this when...
... ... I have been experimenting with ammonium di-(or bi- same thing) chromate and gelatin emulsions off and on for about a year and a half. Though I don't...
I looked into a couple of these but I believe they are for island milling. Converting the xy moves from the gerber to the G-code is the easy part the files...
For your problem to convert to Gcode from gerber, there are three ways: -pcb-gcode (works ok but in Eagle) -export to DXF then into Cam package like LazyCAM...
I had the same idea last spring and purchased a 405nm laser diode with holder/lense and some Riston film off ebay. I added a heat sink to the holder and have...
There is nothing wrong with dryfilm. Only side effect can be its thickness. It is thicker than liquid photoresist. I've used dichromated PVA in order to avoid...
Thank you for the link, Volkan. In my occasional searches over the last few years (mostly for terms like "homemade photoresist") I hadn't found that....
... What's wrong with using dry film photoresist ? Its relatively cheap (under 10% cost of FR4 PCB material per unit area) easy to apply, fairly sensitive to...
Hello Donald, There is no magic for the formula check http://www.holowiki.com/index.php/Dichromated_Gelatin_Chemistry they have detailed information on it. I'm...
The intention is to polimerize/depolimerize the etchresist and solder mask. In the industrie is know as LDI (Laser Direct Imaging). Before the blue-violet...
Excellent news, I thought that Bichromate photoresist needs a high energy density. I gonna try with dry films for etch resist and solder mask with a LASER...
Hello, Volkan. Looks like you have your fingers in several pots (homebrew pcbs, direct print resist, homemade photo resist). I love it. Are you willing to...
... Isn't there some rule which limits selling/marketing messages to one per month? ... http://www.htp.ch/lib/pdf/Liquid%20resist%20for%20PCM.pdf Once i found...
Simao Cardoso
simaocardoso@...
Nov 13, 2009 1:06 am
23872
It's used for UV exposure. ... From: javaguy11111 <javaguy11111@...> Subject: [Homebrew_PCBs] Re: Making PCB using these new 405nm LASER Diodes To:...
Can your laser ablate the copper or just hardens the resist? If the former, I need to buy some blue lasers to try. ... [Non-text portions of this message have...
I've a working prototype. I'm using 150mw 405nm blue ray laser diode. Without complicated optics I can get ~3 mil trace width/space. Currently, I'm using ...
I think you need a 3W UV laser to ablate copper. I saw a UV laser at Fabtech with galvos in an enclosed case. No moving parts. It was sweet. They guy put a...
I had this idea about seven years ago. But at that time the Laser Diodes of 405nm were impossible to obtain (USD$4000). Since last year, I have taken this...
Hi Andy, I've been a lurker here a long time! Just now having some questions and getting around to actually doing something with my circuit.  Yeah the...
I have used electrical tape, Kapton tape, and packaging tape as an etch resist at various times, with moderate success. Often the etchant leaks under the tape...
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