a Steel Box Section Build with SBR20 & Ballscrews Plus a few questions

[grain_r]

Hey Clive

Brilliant thank you very much for that I will get them on order.

I have looked on the cnc4you and the grubscrew pulleys but i'm not sure if there is a formula to stick to or is it not the teeth but the ratio that is important. I'm sorry I have never got to grips with pulleys.

I think the original 1605 ballscrews because now I'm going with Hiwin rails i'm going to maximise the space.

[Clive S]

Hey Clive

Brilliant thank you very much for that I will get them on order.

I have looked on the cnc4you and the grubscrew pulleys but i'm not sure if there is a formula to stick to or is it not the teeth but the ratio that is important. I'm sorry I have never got to grips with pulleys.

I think the original 1605 ballscrews because now I'm going with Hiwin rails i'm going to maximise the space.

I have just noticed that you posted 4Nm I generally use 3.1Nm motors. re the pulleys I will check tomorrow but have a look at 30 teeth for the small one you could also use 1:1.5

[grain_r]

Thanks Clive I will have a look at the 30 Teeth. Like all things I went on the theory the More power the better :)

[Neale]

I'm using two 3Nm motors to drive my X axis. 68V PSU.Steel gantry, with spindle, etc, probably weighs around 50kg. 2005 ballscrews, driven 1-1 through (from memory) 20T pulleys. Gives me about 5m/min rapids. That corresponds to about critical speed of ballscrews and corner speed of motors. 2010 might give me a bit more speed but probably at the cost of acceleration which is more useful if you are doing fiddly detail cutting.