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

Hi,

Is very difficult to find a pcb spindle. Drilling a pcb hole of 0.5mm in
a FR4 laminate needs carbide tools and 50.000rpm spindle. This things
cost more than all other things to make a good CNC router.
I have found a away, but still didn't make/test the thing. From this
great sites (and thanks to them)
http://www.cnconabudget.com/dan_d.JPG
http://www.buildyouridea.com/cnc/spindle_05/spindle_05.html
http://www.cncathome.com/spindles.html
http://www.students.tut.fi/~kontkant/jv2.php.html
http://members.home.nl/zoltar/CNC/classicsystem/10%20euro%20frase.pdf

I think to have found a way to do my 50.000rpm or more (i think i can
get 80.000rpm) pcb spindle.
Using this tool from ebay seller (he made the tool from my request!!)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=110329201156

And high speed skate bearing or better like this
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=400000902567

And a AC brushed (universal) motor from a electric wood plane. It has a
30.000rpm motor and a 2:1 or similar reduction that can be inverted to
give 60.000rpm, using the same timing belt and pulleys.

Do you think it will work nice? I have made a circuit to pwm control the
motor speed. And i think if i give DC to the motor it will run in lot
more than 30.000rpm.

I want to post the circuit online, but which cnzone forum pcb spindles
should go?

Simao