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Inteference Fit

Ball Bearing

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Alan Rawlins	04/04/2015 08:35:23
74 forum posts	I want to machine a small ring of steel to fit a small 30mm outside diameter, ball bearing into it. I want to make sure that the outer ring of the bearing doesn't revolve when in use. How much smaller should I turn the inside diameter of the ring relative to the bearing outside diameter without decreasing the internal clearance of the bearing so much that the bearing locks up, but still doesn't revolve in the ring?
Eric Cox	04/04/2015 08:54:53
557 forum posts 38 photos	You need to machine the diameter a few thou 0.002" larger than the bearing then use Loctite "bearing fit" to secure the bearing Edited By Eric Cox on 04/04/2015 08:55:52
Capstan Speaking	04/04/2015 09:18:54
177 forum posts 14 photos	I second Eric. A spacer ring is not rigid enough to resist an interference fit. It will simply swell up slightly. An old craftsman will assess interference fits as push fit, drive fit or press fit. However a bearing fit is usually sufficient at 0.0002" / 0.005mm interference.
mechman48	04/04/2015 10:11:22
2947 forum posts 468 photos	Do you have a 'Zeus' book handy...it gives you a listing of 'fits' for different sizes holes & shafts.. look in the transition fits..you would be in the region of H7/g6 for your needs... if you don't want to use Eric's Loctite method. George

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