Help with drill-Mill conversion

[Ross77]

Had to put this on hold for a while and then when I got started again last week I crushed my finger whilst honing the ways.........

So decided to move on to the electrical side and sort out the stepper controller, after hours of trying to bypass the optos and feed the chips direct the L6203's (H bridge) decided to put on an impressive firework display.... @ 40V these things sure go bang.:whistling:

So all in all things arnt going to well.

Any body make curcuit boards for L297 + 2x L6203's with diode protection so I can transfer the remaining parts over to a less complicated board?

After a lot of serching on the web I think I've found out why I couldnt get it to work, There is an enable pin on the L297 that has to logic high! Am I right in thinking that will stop the chip from working?

Ive got another board to try, but not to keen to fry that one as well

[Ross77]

I have 2 dead boards and 2 good ones....all to go in the bin and good riddance to the worst £700 I ever spent.

You dont rate these as drivers then? Your not throwing away the good ones are you. :whistling:

Just want to get this thing running. Nearly finnished the x-y axis
Just the spindle, motor and z axisto do....

[irving2008]

@ 40V these things sure go bang.

They go bang because of excessive current not voltage...usually if upper and lower devices in the bridge are 'on' simultaneously... 40v across .5 ohms = 80A peak, 3200W instantaneously.... your PSU will do that for a few 100uS no problem!