Sanghee Sung@sanghee-sung· 542 views
J4 turret housing and needle roller bearing assemblying is very loos
Hi Annin.
This is VUCAtech in Korea. I got my items delivered last month.
I have two question. (AR 4)
Q1 : J4 turret housing and needle roller bearing assemblying is very loos.
Please check Pic 1. Is this correct?

Q2 : J4 main shaft ' OD is 25.4mm and needle roller bearing's ID is 24.5mm. The two cannot be assembled.
In addition, the needle roller bearing OD is 30.25mm.
Different from B1616 (1x1-1/4x1 inch) needle roller bearing OD dimensions.
(Pic 2, Pic 3).
Please check the needle roller bearing we received.


I look forward to your quick reply.
Thank you.

Chris Annin
It would appear the bearing cage is was not manufactured correctly. Please email me at and I'll make sure to get you a replacement bearing.