New member, Lagun Mill

[Robin Hewitt]

Stepper motors should be chosen by looking at graphs showing torque against speed. You can mix and match. They are all 200 steps/rev which suits 2.3" a lot more than it suits 3.4". The stepper market is dedicated to American's who believe more is better and need to be told what to do and what to buy because that is how they were taught in school. Why do you want to power the bed vertically when you can power the quill? You can put a screw along side it. Fix that backlash first or it haunt you.

[komatias]

The lagun is a universal mill right?

You would be better served with servos and good quality ballscrews. Way too much weight to push around and up/down.

Not what I would call an easy conversion by any standard.

[Smokie555]

Ahh, stepper 23 & 34 case size = inches. I have read that over sizing the motors apart from being bulkier and more expensive, results in a slower machine? I thought the speed would remain regardless of size.
Unfortunately my universal mill has a fixed head and therefore no moving quill as per pic’s. My measurement of 9.5 lbs feet of torque to move the Z axis is around 1800 oz in, of course I need to be able to plunge and cut etc so with 2:1 gear reduction I thought I would be ok. But with the X & Y requiring a fraction of the torque to move the tables I maybe need to look at 2.3” steppers for these.
I take your point that backlash is a problem that won’t go away but I am reluctant to start into a ball screw conversion until I’m confident I can get the CNC stuff working. Where do the UK people on the forum buy their hardware from?

Sorry for the daft questions and thanks for the advice