The illusive Boxford 260vmc

[Ricardoco]

there is a way to do it automatically in mach, you enter the pitch and steps and gearing and it works it out for you, but it should be 200 steps. Try it on 200 steps, it's easy to change when you know how much it's out.

Ah ok, well I will get out in the yard and uncover it as soon as I get 5 mins

[i2i]

basically the motor has 200 steps per revolution, if the pitch of the ballscrew was 1mm and the screw was directly driven by the stepper, then one revoultion of the stepper would give you 1mm set at 200 steps. But if the pitch was 2mm then it would have to be set at 100 steps to give you 1mm movement. It gets a bit more complicated when the stepper drives the ballscrew through a toothed belt and two different sized pulleys, as in the boxford. So to get back to the 1mm movement for one revolution on a 2mm ballscrew you would have to gear the motor down by 2:1 at 200 steps.

[Ricardoco]

Blimey sorry about that i dropped off to sleep there :) Ok so if i find out the pitch of the screws and the gearing of the steppers i will be ready to set this information in mach... I will get on that first thing tomorrow morning, That should be fun lol..

Rick