Hi,

There is a situation:

I have plasma table, step motor 400 steps/rev, gear ratio 1:5 and rack and pinion 30 mm pitch diameter. Here is my calculation:

400 * 5 = 2000 steps/revolution of pinion,

path per one revolution of pinion: 30 * pi = 94,347779 mm

path per step: 94,347779 / 2000 = 0,0471 mm.

steps per unit (mm): 1 / 0,0471 = 21,22.

So far so good.

Now Motor Tuning in Mach3:

I put 21,22 steps per unit (mm), and velocity 4000 mm/min (what is 66,66 mm/sec)

Step frequency will be 21,22 * 66,66 = 1414 Hz

But motor run to slow and oscilloscope measurement shows step frequency about ten time slower, e.g. 135 Hz!

Who is mistaking, me or Mach3?

PLEASE CONTROLL MY CALCULATION

Regards,

mrpeja