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Unread 10-07-2012, 09:04
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Re: Press Fit

Quote:
Originally Posted by sanddrag View Post
"A few thousandths" is FAR too much interference unless you have a really big bearing. Ideally, you're looking for something in the neighborhood of 4 ten-thousandths undersize for that size of bearing. You can get special undersize reamers to do press fit bores.

Let me ask, why do you need a press fit anyhow? In FRC, they're often more trouble than they're worth. Just make a good close slip fit and use part geometry to keep everything in place (flanges, shoulders, counterbores, snap rings, etc).
to elaborate on sanddrag's post for a press fit it is a pretty simple process....look at this chart: http://www.turnedoutright.com/wp-con...rill-sizes.jpg

You select a drill size two sizes smaller than your desired hole size, go one step up to ream out the hole, and then press it on

for example: if I want to press onto a 0.250" shaft, I would go down two steps to a size D drill (0.2460"), then ream out the hole one with one size larger (0.2480"), then press....and you are done
 


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