New build.Stell frame cnc 1500X1000.Ball screw and gearing calculations

[ba99297]

Jazzcnc thanks for everything
Sorry for insisting to ask but i am trying not to make mistakes ( at least to make as little as possible).


First question
This gear 2:1 and 2010 ballscrew should be applied at all 3 axis ( X,y,Z)
I think Z axis has not issue because of its small length, X also has rpm threshold 2400+rpm

Second question
In order to reduce inertria at Y ( considering that i will use 2 ballscrews ) is it logical to go with 1610 ballscrews instead of 2010 ?

Third question
You told me
"I can tell you from experience that you will easily run 1.5mtr length 20mm screws @ 1500rpm with out any problems provided they are aligned and use correct end bearings."

Are the "made in china BF and BK" that chai sells, the correct end bearings or i should go to something else?

Forth question
A well aligned and tensioned pulley ( really how we mesure tension?) does it have backlash?

Vagelis