Pressing In Bearings

[Jim77]

Hi all,

Might seem like a daft question but when pressing in a bearing how do you know when to stop?

Is it just a “feel” thing i.e. the resistance goes up loads?

Cheers

Jim

[jb]

You will feel a definite stop, If pressing using a vice. If knocking it in with a drift then the sound will change from a thud to a knock - not realy recommended on small bearings.
Don't worry about over doing it they can stand a fair bit of over pressing within reason and providing your not pressing or drifting the bit that not being pressed on to the shaft or into the housing.

[Jim77]

You will feel a definite stop, If pressing using a vice. If knocking it in with a drift then the sound will change from a thud to a knock - not realy recommended on small bearings.
Don't worry about over doing it they can stand a fair bit of over pressing within reason and providing your not pressing or drifting the bit that not being pressed on to the shaft or into the housing.

Ok thanks for your advice.

[jb]

All assuming you start it off square to the hole of course. good luck.

[Brucey]

in a world full of good adhesives I find pressed-in bearings somewhat barbaric. The press-fit always interferes with the internal clearance of the bearing and very often the fit isn't as specified anyway. The net result is that the preload often isn't as intended, and worse yet, you may have a positive or negative clearance that you know next to nothing about, which has implications for bearing life. Bearing installation via other means can result in lower stresses, which in turn can translate to more consistency and longer bearing life.

[Manc33]

I have a BB30 bottom bracket shell and ended up using the Praxis Works converter, that screws into itself and has far less chance of slipping. Such a daft design.

[al_yrpal]

If the bearing housing is sized to require you to press in the bearing thats how its supposed to be. The interference fit will be such that there is no damage to the bearing. The main thing is that the outer ring of the bearing shouldnt be able to rotate in the housing.

The important thing is to press the outer race only and press it evenly so there is no tendency for it to tilt and jam. If its really tight pop the bearing into a freezer and evenly warm the housing before attempting to insert it.

Al