Please take some important notes:

In reality the screw is 25.00mm. And as all must be lined up to under 0.01mm/ 0.02mm could be felt as tightening at certain point/ so you can use 26mm of the center hole with no problem.


You must not make the parts smaller than the fitted part! |I have made that mistake and is impossible to fit correctly. Make all parts "press fit" 0.02mm bigger That means shaft must be 0.02mm bigger than inner bearing and bearing bed must be 0.02mm smaller


You know what i am saying? This is not a skateboard wheel. All your design is based on "esy to service", but in reality it must be based on "precision"




I dont know why the worry about the thickness. Let's speak in mm as this Imperial system gives me a headache

If i am not wrong ~ = The bearing has 35mm internal diameter. 22t pulley has ~35mm OD and ~31mm diameter on the tooth lowest point/35- 2x~2mm/ . So if the hole is 27mm that gives a 1 mm clearance from the 25mm ball screw, then (31-27 ) /2 = 4mm wall at the pulley thinnest point, so whats the big deal?
Even so where the tooth is its thicker by 2mm so...???