Setting up stepper motor drivers

[JAZZCNC]

50V supply on 50V drive is bad idea.! . . . your in danger of back emf frying them on de-acceleration. On a lathe it probably won't be a massive issue because it wont be de-accelerating from high feeds but @50V your on the edge.!!

First I would double, triple check all your wiring, esp the motors phase connections.

Check your amps are not set too high on drive, then like john says try other settings.

What model motors are they.?
How have you got the motors wired.? Parallel or series or unipolar.

[croy]

I think it is just my settings. as the only thing that changed was to replace the myford leadscrew with a ballscrew.

coupled with a belt 20 tooth on the motor and 40 tooth on the screw.

50V supply on 50V drive is bad idea.! . . . your in danger of back emf frying them on de-acceleration. On a lathe it probably won't be a massive issue because it wont be de-accelerating from high feeds but @50V your on the edge.!!

First I would double, triple check all your wiring, esp the motors phase connections.

Check your amps are not set too high on drive, then like john says try other settings.

What model motors are they.?
How have you got the motors wired.? Parallel or series or unipolar.

[JAZZCNC]

I think it is just my settings. as the only thing that changed was to replace the myford leadscrew with a ballscrew.

coupled with a belt 20 tooth on the motor and 40 tooth on the screw.

Please dont take this wrong way but you have changed the steps per to take into account the gearing.?

[croy]

Hi No i dont think i have.

Dont worry i am not offended just grateful for the help

[JAZZCNC]

Hi No i dont think i have.

Dont worry i am not offended just grateful for the help

Well there's your problem then.

If 1600 micro steps and 4mm pitch with 20T on motor and 40T screw then try 800 in steps per. So formule (micro steps/pitch) * (screw pulley/motor pulley)

[croy]

Thanks, i am going to finish watching the rugby, then i'll give it another try.

Well there's your problem then.

If 1600 micro steps and 4mm pitch with 20T on motor and 40T screw then try 800 in steps per. So formule (micro steps/pitch) * (screw pulley/motor pulley)

[JAZZCNC]

Thanks, i am going to finish watching the rugby, then i'll give it another try.

Erm ye Should I really be helping a welsh man after kicking our arse's yesterday. .

[croy]

Hi Jazzcnc, going on the figures you worked out would i then be correct in surmising that my potential accuracy for turning can be 0.005mm

Accuracy = Pitch/Steps per

Well there's your problem then.

If 1600 micro steps and 4mm pitch with 20T on motor and 40T screw then try 800 in steps per. So formule (micro steps/pitch) * (screw pulley/motor pulley)