Homebrew PCBs

n4onl wrote:

> Hi everyone.
> Just found this group and I have been skimming through the posts.
> I'm interested in building a CNC PCB mill/drill. Stepper motors,
> linear bearings/rods, antibacklash nuts on Acme rod... and a Black
> and Decker RTX. The resolution works out to 0.0005" per full step and
> 0.00025" if I half step.
>
> Is 1/2 or 1/4 of a thousands a good resolution for this project?
>
> Does anyone have links to similar projects?
>
> Hints? Tips? Insight?
>
> Thanks
> mike

Are you really able to get a repeatable and accurite resolution of 
0.0005" on your ACME screw? What about motor oscilations and over shoot 
(gotta love steppers)? Then there is the question of your guides and 
play in them. You might be asking a lot to fabricate that. Take a look a 
Dadel / Parker and see thier specs. Then remember they are doing this 
for a living, granted in larger quantities with out the TLC. I am just 
asking the question.
John

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-- 

John van Loon
Control Intelligence
http://www.controlintelligence.com
john@...
(905) 521-5505





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