Hello,

I am building my first CNC and start recieving linear motion pieces from China.

I have got one of my SFU1605 kit and I noticed that I have got nearly 0.1mm of axial backlash on the BK12 support.

This is due to the bearings that are "of course" cheap chinese one simply branded as "6001Z".

I'd like to replace them but I have a few interrogations about them :

- Angular bearing seems to be the best for axial forces but only one SKF angular bearing is over 50$.. it would means 300$ for the 3 axis (BK12) which is way too much for my build. Have anyone already tried chinese BK12 mentionned with angular bearing in it ? They only cost 15$.. I am a bit suspicious..

- If I want to replace them with tradiationnal bearing (but quality one), should I take normal one or C3 one ? Because as I understand it, C3 is for additionnal clearance for high speed running. So it sound better to take standard one without clearance but on another hand "C3" bearings often seems to be mentionned as an advantage in ball screw kit. I am a bit confuse here..

Thank if someone can help me.