Step frequency

[drk]

Hi, I recently changed my motors from steppers( i ran them with my self made L297, L298 driver) to some old iron core type electrocraft motors ( 60V, 16ozin) and used Gecko 340 s for that.
The encoder are renco with 500 lines ( 2000ppr after quadrature). The machine im retrofitting with these motors has a 22mm ballscrew with 5TPI.

My question to you experts is that :

1.To achieve a linear travel speed of 100-400 inches a minute, what should be my step signal grequency range.

2. With geck drives, there is no nee for tacho feedback, so while the drive makes sure that the difference between the no of pulses sent ( step signal) and those received from the encoder are the same ( position reached) what parameter controls the time the motor takes to reach the desired position and the motor speed at which it shall rotoate, is it the voltage??

Thanks

[ger21]

It depends on what you set the step multiplier to. If set to 1, you need 400 inches divided by 60seconds, times 5 tpi, times 2000 steps per turn, which is 66,666 Khz. Set the multiplier to 2 and you'd only need half that. I think this is right.

No, not the voltage. The software controller (Mach2, for example) has settings for acceleration, and sends that information to the Gecko's based on the programmed feed rates and distances moved.

[drk]

Thanks, I just hope my microcontroller is able to generate a good enough waveform at that high a freq.