Bearings

I'm working on a project at present which requires a couple of bearings. I've ordered the bearings, 19mm od, 10mm I'd. I,ve fitted and removed bearings in the past, but have not machined parts to fit. My drawing shows a 19mm recess for the bearing and a 10mm shaft. My question is do I need to allow - mm tolerance to the recess and shaft? If yes, what value should I consider? Or is a 19mm x 10mm designed to fit a 19mm recess and a 10mm shaft?

Thanks in advance

Bob P..

Bob P
Is the shaft going to be a press fit onto the bearing. and into the recess.
If I am reading this correctly 10mm dia for shaft to fit into bearing. That is a big bearing what is it for.

Bob

Hi Bob

im building Jan Rissers sabine IC engine.

Bob P

Sorry Jan Ridders ( bloody IPAD)

Bearing manufacturers web sites typically give information on fitting bearings - including housing / shaft dimensions.

In some cases you may want slightly different dimensions for each bearing (axial movement allowed at one bearing to allow for shaft thermal expansion).

If you accidentally cut too much material away, there are 'bearing fit' adhesives available that can save the day (widely used in industry beacuse quicker/cheaper than close tolerance machining).

Note (for precision work such as a machine spindle): Ball and roller bearings are manufactured so that the outer race contracts to the correct diameter for running when pressed into its housing with a recommended interference fit Colin.

Hi Guys,

The other day, whilst frozen out of the engineerium, I was browsing You Tube and came across this site.

http://www.youtube.com/user/MaProNL/videos?view=0

An SKF bearing site showing how to do bearing fitting in an approved manner. Well, approved if you have a fortune to spend on their special kit! Even with this in mind, some are worth watching. It is always nice to know how things should be done, even if you have no chance of doing it that way.

chriStephens

Bearing fits are much to complicated to go into here, for a start depends on which is rotating, inner or outer ? For general model making I would make outer and inner a good push fit with a touch of bearing lock if needed.