Bearing fit problem

[paulus.v]

Hello all,

I want to fit the bearing in image in the 40 mm thick aluminium plate. I am thinking to heat the aluminium to have 80°C temp difference. But I have no idea what size to bore the plate. I am thinking at about -0.04/-0.05 mm.

I want to use the following method posted by Jonathan:

When boring something for a bearing on the lathe, for myself, which requires a press fit I slowly approach the required diameter and machine the first few millimeters of material to the size where the bearing only just slides in. Then back off the appropriate amount for the press fit and machine the rest of the hole

Just need to find the "appropriate amount". The bearing needs to hold up axial load as it will be used for a rotating ball nut.

Best regards






EDIT:
Just realised that the motor will transfer the heat to the plate and the expansion difference between aluminium and plate will loosen a little the bearing. I need to fit the bearing so tight that at -10°C the aluminium (6063) will not crack.
Or should I look for another mounting design?