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From: "Robin S"
Subject: Re: HELP! CNC/servo/stepper controllers needed
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Thu, 5 Sep 2002 22:49:46 -0400
NNTP-Posting-Date: Thu, 05 Sep 2002 22:48:45 EDT
Organization: Bell Sympatico
"Ralph Seguin" wrote in message
> I forgot to post this on alt.machines.cnc et al.
> I'm on a very limited budget, and I am looking for
> inexpensive (??) PC based (PCI/ISA/parallel) 5 or more axis
> controllers (3
> axis + rotary table + ...?) for use with EMC (or other
> softare in Linux, DOS, ...) for:
> -fixing/retrofitting my existing Bridgeport mill (has
> an OLD Retrotek 8800 CNC controller that doesn't work
> well, and often flakes out). The mill already has precision
> ballscrews, and DC permanent magnet servo motors. This is
> one of my top priorities. This current CNC control reads out
> and moves in 0.0001" increments, and I'd like
> something at least as good (but WAY better for the
> computer hopefully :-)
What does that mean? You want to cut parts to less than one ten-thousanths
of an inch? Do you know what this requires? What kind of parts are you
making? Do you have the capability to measure these parts to that
resolution? What's the shop that you're working in like?
> I know that there are some nice boards out there for
> $800+, but that is beyond my budget. Anybody have any
> suggestions? The 8 axis servo-to-go board looks really nice too :-(
If $800 is too much, you're going to have trouble cutting parts on a mill to
less than one tenth.
> -What stepper motors (or servos) and controller would
> be good to use for driving a 3 or 4 axis mill or stage
> (say 20"x20"x8" travels)? With Acme screws? With
> ballscrews? Say with 50lbs of table + work.
What does that mean? How big are your parts? Are you running two-thousand
pound castings or single printed circtiut boards? How fast do you want to
move your part?
> -I know very little about electronics, but would like to learn. Is it
> reasonable/feasible to build a servo and/or stepper controller for
> driving high torque servos and/or steppers? I have a feeling that
> this would cost a LOT of time, which is also in short supply :-)
Can I ask why you've taken on this project? If you want to build what you're
talking about, it will take lots of time and money. If you want to buy the
machine, it'll cost LOTS more money, but LOTS less time.
I'm no expert but I've gone through a project or two like this. What
_exactly_ do you want to do with this machine? _Exactly_ how much money do
you want to spend on it? _Exactly_ how much time do you have to spend on it?
_Exactly_ which tools do you have to work on it?
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