Funny how the original Edison Bell phonograph gets updated and changed from sound recording to light recording.
Malcolm
I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The writing is on the wall.
Ha-ktovet al ha-kir
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On Thu, 5/1/14, Boman33 <boman33@...> wrote:
Subject: RE: [Homebrew_PCBs] updated my laser photoplotter
To: Homebrew_PCBs@yahoogroups.com
Date: Thursday, May 1, 2014, 4:42 AM
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 stillrunning on the creaky Cyrix-CPU ISA-bus PC
with a DMA card. I was worried abouthow much
longer that PC would still run.I replaced it with a
Beagle Bone, and used the PRU component of that
processorto emulate the DMA card in the PC. I
had a few software bugs that wereembarrassingly hard
to find, but it now works just fine.It does 1000 x
1000 DPI and is VERY accurate, I have made solder
stencilswith 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 masterartwork to etch solder paste
stencils, now that PC boards are so cheapfrom
China.) Plotting speed is 0.6" per minute, and it
can do up to20 x 20" films.SeeHomemade Laser
Photoplotter for more info.