Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Nice work DJ!

Commercial drillers are using scary federate drilling several holes per
second.

I have been using one of the little turbines too for PCB drilling. They
work very well, Harbor Freight also usually have them for less than $20.



On your link below it talks about steppers, I did not see anything about the
brushless DC motor controller.

Bertho

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From: DJ Delorie Sent: Monday, April 02, 2012 20:56

Been working on this project for a long time, finally got some results...

DIY CNC 409 0.0145" holes in 12 minutes
www.youtube.com/watch?v=SR1y6Eq19EU

The CNC machine uses three brushless DC motors instead of steppers, I had to
make my own controller boards, write the firmware, build the table... many
steps.

controller page: www.delorie.com/electronics/bldc/
photos: www.delorie.com/photos/cnc/ (including close-ups of the drilled
board)

I have an excellon-to-gcode script for drills if anyone's interested,
although there's some new features I still want to try, and I want to
see how fast I can get the drilling cycle to go without breaking any
bits :-)



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