Re: [CAD_CAM_EDM_DRO] Home build CNC

On Mon Apr 29 03:21:05 2002, Steve Blackmore, <steve@...> wrote:

>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

I dimly recal it's being mentioned, but not the details. What exactly are you
having a problem with, vis a' vis, H bridges? Theoretically you can make an H
bridge out of almost anything, even relays, though you might need a little
superhero help from, "Cap'n Diode", to lock out relay ringing.....:-)

Bill

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