Homebrew PCBs

I am also making one. You can see the details at ....

http://homepage.ntlworld.com/moonshadow/New_Folder/engraving1.htm

At the end you will find lots of links to other related sites.

John.
  ----- Original Message ----- 
  From: starsnstripes_2003 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Sunday, July 27, 2003 2:54 AM
  Subject: [Homebrew_PCBs] Milling m/c bug


  Ok, all this talk has given me the bug to build a milling machine 
  for pc boards. Something that will be semi-precision.
  Maybe some of you guys can offer some good tips for building an X/Y 
  table?
  I am a poor person and want to hold cost down as much as possible, 
  so ideas like the "Drawer Slide" linear motion bearings are greatly 
  appreciated!

  Slides:
  I'm not sure how much play are in those drawer bearings. Probably a 
  lot. I'll have to look for some good ones, or maybe make my own 
  slides from brass or UHMW channels. I've dealt with different types 
  of gibs and round shaft/ball bushings before, so can probably figure 
  out something that is semi-precision at low-cost.

  Linear Motion drives:
  Stepper motors are the obvious low-cost solution, but I'll need to 
  find some good resources for cheap parts that will work properly as 
  a complete system.
  True servos? Better but not as available as "surplus" ?
  Either one would of course need suitable controllers and software.
  I can write some software (VB and Perl) but I think some 
  shareware/freeware is available to handle conversion from different 
  CAD programs...
  Then I'll need to fabricate the mechanical drive portions: Leadscrew 
  or Timing Belt like printers?

  Design parameters:
  What are the largest boards I should allow for in the x and y axis 
  travel? 8", 12"?

  Anyone who has experience with such things, please chime in if you 
  know of some good sources for info or parts!



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