Bearing shrinkage

[Jeff]

I am turning a bearing housing for the rear wheel of my race sidecar, and want to know how much do bearings shrink if you chill them? The old housing was a loose fit and it shouldn't have been.

https://www.aulro.com/afvb/images/imported/2013/11/315.jpg (http://s1336.photobucket.com/user/Jeff_8/media/Machining/221120131978_zps205541ac.jpg.html)
Start with a billet of 7075-T6
https://www.aulro.com/afvb/images/imported/2013/11/316.jpg (http://s1336.photobucket.com/user/Jeff_8/media/Machining/221120131988_zps6a2d104e.jpg.html)
Make lots of swarf.
https://www.aulro.com/afvb/images/imported/2013/11/317.jpg (http://s1336.photobucket.com/user/Jeff_8/media/Machining/221120131991_zps8faea214.jpg.html)
The bearing is on the right. 1 inch inner 2 inch outer.
Jeff

:rocket:

[Bearman]

I have never measured the difference after chilling as you have to get it installed asap as it returns to original spec pretty quick, but it does make a tight bearing slip in pretty easy.

[uninformed]

I would have thought the amount that a steel bearing would shrink if put in the freezer alot less than the expansion of a aluminium housing if heated.

I put some standard LR wheel bearing cups in the freezer to shrink for installing in the hub. IMO it did not make bugger all diference, if anything the condensation was a PITA.

[Pedro_The_Swift]

might help?
Liquid Nitrogen Services (http://www.liquidnitrogenservices.com.au/shrinkfit.htm)

[komaterpillar]

I had to install a boss on a 5" shaft, 6thou interference fit, chilled the shaft with liquid nitrogen and got the boss to 160℃ on a hotplate and they slid together fairly easily with minimal persuasion,

Getting the old boss off was another story, 80tonne ram on porta power and a LOT of heat.....

[Pedro_The_Swift]

yep,,
with interference fits you MUST be sure the first time,,, ;)

[bee utey]

Most shaft bearings I have met have a slight clearance in the housing. This allows the outer race to creep and equalise wear around the whole ring. If you're going for a press fit make sure your bearing is toleranced for same.