Home build CNC

Just an update to let you know I've updated my CNC pages and the
Parallel Port interface and L6203 Bipolar Chopper Driver schematics
and PCB overlays are available for download.

see http://www.pilotltd.net/cnc.htm

The Parallel Port interface features 4 Axis control and provision for
3 relays, 4 home switches and limit switches, and 12V output for
cooling fans etc. It will handle up 45V input.

It also features a smart current monitoring device, which is included
courtesy of Hans Wedemeyer. This is a really useful addition, it looks
for pulses on any axis and if none are received for either 1 or 5
minutes (selected by jumper) it shuts down the power to the drives. As
soon a pulse is received it powers up again and doesn't miss the first
pulse!!

see http://www.hans-w.com/cnc.htm for more of Hans projects.

The L6203 Bipolar driver will handle up to 48V input and 5A peak, 4A
continuously.

If running at high currents it MUST be heatsinked - I've made this
very easy, the 6203's are right on the edge of the board and can be
fixed to a common heatsink. The tab is connected to ground.

I'm still looking for help on the H-Bridge design :(

If anyone can help, or has any suggestions please contact me.

Regards


Steve Blackmore
--
Pilot Consultancy Limited ***** Computer Consultants
Telephone 01744 752256 Mobile 07831 768478
Email: steve@... WWW: http://www.pilotltd.net