[Coco] Homebrew CNC (was: high density floppy controller mods
gene.heskett at verizon.net
Mon Aug 7 16:33:03 EDT 2006
On Monday 07 August 2006 14:34, Roger Merchberger wrote:
>Rumor has it that Joel Ewy may have mentioned these words:
>>I've got a homebrew CNC PCB drill press that's just waiting
>>to punch holes in some copper-clad...
>Do tell... ;-)
>Any specifics? Details? Plans? Schematics? Tips?
>Also - is it strong enough to route? I'm thinking of the odd "winged"
>ground connections on the CoCo's socket - if they could be auto-routed on
> a board, that would be *very handy*... ;-)
>Roger "Merch" Merchberger
I think I could do that, Roger, for board sizes up to about 4.5 x 10
inches. The control computer runs linux (kubuntu-6.06 atm) and emc2's cvs
HEAD I built yesterday.
What I'm missing, and thats being worked on by Chris Radek on the emc list
I believe, is a gcode generator that can scan a 1 bit image depth file of
the artwork and make gcode out of it. We're already doing that with
truetype fonts and a text input, so I can carve brass house and mailbox
nameplates, & other such onesie and twosie stuff. For pcb's, I'd also
need a source of suitably smallish endmills as the least width I can
remove ATM is 1/8" wide. My brass carving bit is smaller, but its also a
round nose style. But they are available, just bring money. And
patience as a .010" diameter mill isn't going to slice 2 oz copper at
20"/minute at only 2500 rpm. Too fragile to push that hard unless you've
10x the spindle speed I have. I'd need to invest in or make smaller R8
collets too, currently 1/8" minimum there.
The basic machine is the $300 Harbor Freight micro-mill but I've replaced
the z screw with a good 10 tpi acme, and the tables have been replaced by
the bigger acccessory tables for it available from The Little Machine
Shop, aka LittleMachineshop.com. I've probably blown another $400 on
other accessories for it along the way. The motors and drive amplifiers
are steppers, from www.xylotex.com, and I made the motor mounts and
couplings, and the new z axis drive. And I'm having a ball :)
>Roger "Merch" Merchberger | "Bugs of a feather flock together."
>sysadmin, Iceberg Computers | Russell Nelson
>zmerch at 30below.com |
People having trouble with vz bouncing email to me should add the word
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Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
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