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I remember your laser plotter from you original posting.
A great project!
From: elson@... Sent: Wednesday, April 30, 2014 23:21
Well, I finally got around to updating the laser photoplotter I built in 1996. it was still
running on the creaky Cyrix-CPU ISA-bus PC with a DMA card. I was worried about
how much longer that PC would still run.
I replaced it with a Beagle Bone, and used the PRU component of that processor
to emulate the DMA card in the PC. I had a few software bugs that were
embarrassingly hard to find, but it now works just fine.
It does 1000 x 1000 DPI and is VERY accurate, I have made solder stencils
with it that match within a couple thousandths of an inch over an entire
8 x 12" PC board fabbed in China. (I use it mostly for making the master
artwork to etch solder paste stencils, now that PC boards are so cheap
from China.) Plotting speed is 0.6" per minute, and it can do up to
20 x 20" films.
See
Homemade Laser Photoplotter for more info.