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?

https://anninrobotics.com/wp-content/uploads/2025/08/J4-turret-housing-and-needle-roller-bearing-assemblying-is-very-loos.avif

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.

https://anninrobotics.com/wp-content/uploads/2025/08/J4-turret-housing-and-needle-roller-bearing-assemblying-is-very-loos_2.avif

https://anninrobotics.com/wp-content/uploads/2025/08/J4-turret-housing-and-needle-roller-bearing-assemblying-is-very-loos_3.avif

I look forward to your quick reply.

Thank you.