Hi guys ,

I am upgrading my homebuilt cnc and have THK 2010 rolled ballscrews C7 class.
On them i have BNT2010 2.6ZZ NUTS and those are not preloaded thus having as far as i understand 0.1mm axial clearence.
Motion is provided by Nema34 closed loop steppers with LOADS of power..

Is it possible just to change the balls with a number bigger balls to achieve lower clearance and thus eliminating that tiny backlash , or should i just live with it ?
My cnc is 95 procent used for wood where high precicion is not needed , but then again never a bad thing to have high precicion.

5 procent will be with aluminium and i have the option to calculate backlash into my control software.

Just thinking what would be easy to do and not very costly

Another thing i would like to ask here is greasing ? I have a couple of buddies that work with cnc mills every day and they NEVER had to grease their ballscrews not linear carriges ., i thought those would need regular greasing/oiling ????

Best regards

Kristjan