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Fri Nov 13, 2015, 04:57 PM

how cool is this? a $20 CNC Machine



Per the description:

3 old floppy drives + Attiny2313 + SN754410 + Mach3

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Reply how cool is this? a $20 CNC Machine (Original post)
Currentsitguy Nov 2015 OP
exindy Nov 2015 #1
Currentsitguy Nov 2015 #3
exindy Nov 2015 #4
exindy Nov 2015 #2
liberalguy Nov 2015 #5

Response to Currentsitguy (Original post)

Fri Nov 13, 2015, 05:09 PM

1. Miniature bed plotter.

I played with a 20x30 inch one back in the 80s. And a big drum guy that ran a roll.

Fun to play with. Got to exercise some Fortran I picked up in college. I even linked into my fortran subroutines from the other languages.

Started working on a rube goldberg conversion of the bed one to mount my router and expand the subs into the Z-axis. Then events....

Those were the days my friend.... we thought they'd never end.

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Response to exindy (Reply #1)

Mon Nov 16, 2015, 04:08 PM

3. funny you should say that

Our winter project here is to build a Rube Goldberg machine that will mix a martini. I'll post as it develops.

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Response to Currentsitguy (Reply #3)

Mon Nov 16, 2015, 06:11 PM

4. Cool. I'm weak in the servo interfaces but it'd be interesting to follow.

The bed plotter only had one pen and the bar that held the pen and the servo to raise and lower it were pretty light. Trying to adapt a power takeoff from a router was beyond my mechanical abilities and I have no doubt would have broken the thing anyway. But it was fun to try to figure out.

I was probably more into the conversion of the "pen up", "pen down" operation into a "how far up", "how far down" from a programming standpoint. That and cleaning the cobwebs off the trig functions in my brain.

The conversion of the interface to a PC was pretty easy cause it was a serial device. I'd already developed the serial device driver for some communications stuff so the adaptation there was simple. Just commands with an op code and arguments.

The plotter was like this one but a little bigger. The company that made it was into the big graphic terminals and it had originally been driven by an HP mini.



Most of the people I worked with thought some sort of magical incantations made it work. So they usually just left me alone.

Like I said, thanks. Cool memories.

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Response to Currentsitguy (Original post)

Sun Nov 15, 2015, 11:30 AM

2. Got a hearty hohum out of this thread, I see.

That's ok.

Brought back fond memories of a road not taken.

Thanks.

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Response to Currentsitguy (Original post)

Mon Nov 16, 2015, 08:32 PM

5. Pretty cool. I built a 4'x8' one several years ago.

 

I love it, but it cost some orders of magnitude more than $20.

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