Bearing Fit Specifications for Shaft and Housing. 1

[franklineng]

I'm constructing a small rotating tool stand and planning to use two sets of tapered roller bearings (Timken L44643 2 bearings. The average loading would be less than 500 lbs. The nominal shaft size is 1.0 inch diameter, and the housing is 1.98 inch diameter. The housing would be stationary and the shaft would rotate. The shaft would be turned by manually, so speed is not an issue. I've reviewed the websites on bearing fittings, but would anyone with a better working knowledge be able to suggest the tolerances I should use for the shaft and housing?

 

[MikeHalloran]

Get a Timken catalog.

Failing that, look up the interchange and get someone else's catalog for the same bearing.



Mike Halloran
Pembroke Pines, FL, USA

 

[swertel]

I agree with Mike. I always just get my shaft or housing diameters, with tolerances, from the vendor catalog. If that fails, call Timken and request an application engineer.

--Scott

http://wertel.eng.pro

 

[gearguru]

Call Timken. They engineers will answer any questions. Free.

 

[hydtools]

See fitting practices sections of this catalog

http://www.timken.com/en-us/products/Documents/Engineering Section.pdf

Ted

 

[IceStationZebra]

Hydtools has the right approach. I have done this with forklift wheel bearings. ISZ

 

[Tmoose]

If the shaft would be horizontal the loading is kind of opposite to a trailer wheel, so the clearance-on-the-axle, races-tight-in-the-hub would be reversed, but for way under 100$ you can buy all the parts to make an assembly and have them in a few days. Rotating by hand I think it would take a long time to suffer any real harm from bearing creeping on the shaft

http://www.northerntool.com/webapp/wcs/stores/servlet/category_6970_166839

http://www.northerntool.com/webapp/wcs/stores/servlet/category_6970_166839+166843+775720

http://www.northerntool.com/webapp/wcs/stores/servlet/category_6970_166839+166845+775725

 

[geesamand]

I'd make the cups a transitional fit and the cones about .001-.002 tight. Set endplay to suit - less than .001, maybe even preload.

Dave