Bearing fit problem

[birchy]

As said above, you need to stop the bearing moving under axial load. If the axial load is in one direction only, you could get away with leaving a 3mm step on one face so that the bearing presses in but ends up flush on one face? Failing that, you'll need a step and an internal circlip. Or a circlip either side. Or a step and a stepped shaft. Or...

[paulus.v]

Thank you for your replies.

I ended up with this




... but my question still remains. As the plate gets hot from the stepper, assuming a 50°C temperature change between assembling and max. operating motor temp., the difference between aluminium and steel (bearing) expansion will be 0.02mm. As I don't want to end up with play I need to use heat mount but I'm not sure if -0.05mm for the hole is fine or should I try with more? My only concern is the elasticity of the aluminium..

[m_c]

I think you're over thinking this.

Provided the retaining plate actually presses against the bearing and holds it in the housing, then there will be enough give in the plate for what is a very minimal amount of expansion.