Stepper problem

[eurikain]

So sorry for the delay !

Have you measured the resistance between each pair of cables ie between red/blue black/yellow etc they should read all the same + or - a very small amount.

I will try tomorrow. How am I supposed to test this ?

Also as Dean has said re the printer cable make sure it is a straight through cable ie pin 1 to pin1, pin 2 to pin2 etc. AS when you say you have used it before was it on a printer? Not all printer cables are straight through.

I bought this cable brand new three years ago and only used it with my CNC electronics, never on a printer. I will check that all pins are straight through (actually, how do I do that with no juice on them ?) and get back to you tomorrow.

bi polar parallel wants more juice

Could I wire them in series ? Then they'll need 1.4A and I'll be fine (for now).

why don't you run them at a higher res?

What do you mean ? 1/16 or 1/4 ? FMD2740A can't do 1/8 or 1/4, only full, 1/2, 1/16 and lover.

Yes and also try setting the Step pulse so it's ahead of the Dir pulse. You'll find this in motor tuning.

Sounds good, I'll try that tomorrow and let you know. I'll wire only three motors and see what comes out. i'll post pictures/videos if I can.