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Old 11-19-2012, 04:51 AM   #1
TheRadBaron OP
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How much tolerance for wheel bearing press fit?

I have a rear hub from a Yamaha XT500 that I'm preparing to have some machining done. I need to machine the 40mm wheel bearing bores out to 42mm. What is the recommended interference fit for a wheel bearing? I'd like to have a definite diameter to tell the machinist.
I know that I could get an idea by measuring the the hub that I have, but I'd rather hear the official number. I tried looking it up using machinist literature, but not being a machinist myself, it was like a foreign language.
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Old 11-19-2012, 05:12 AM   #2
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.001". Fit bearing with anti-seize.
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Old 11-19-2012, 05:21 AM   #3
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.001". Fit bearing with anti-seize.
That's way too heavy for a bearing and will likely to damage it. Try .0003-.0005" smaller than the bearing OD on the bore.
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Old 11-19-2012, 05:43 AM   #4
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.0005" to .0008" per inch of bearing diameter.

Make sure the bore is clean before pre-heating it. Chill bearing in freezer.
Install w/o hitting the inner race as this is a prime cause of short bearing life.
I like drawing bearings in with a bit of all-thread.

SKF and New Departure have specs.
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Old 11-19-2012, 08:23 AM   #5
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This link has all the info you need (and more)

http://www.nsk.com/services/basickno...03fitting.html


But I can save you a little time and say 42 +0.0 -0.012
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Old 11-19-2012, 08:42 AM   #6
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Man, I opened that document and it's pretty esoteric stuff (to a non-machinist). I know that I could spend the time and get sufficient reference data that I could understand it, but I'd really rather not .
As far as the measurement that you gave me, am I correct in taking that as meaning that I should have 0.012" (12 thousandths) of interference? This seems excessive to me. Did you mean 0.0012"?
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Old 11-19-2012, 08:51 AM   #7
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Originally Posted by TheRadBaron View Post
I have a rear hub from a Yamaha XT500 that I'm preparing to have some machining done. I need to machine the 40mm wheel bearing bores out to 42mm. What is the recommended interference fit for a wheel bearing? I'd like to have a definite diameter to tell the machinist.
I know that I could get an idea by measuring the the hub that I have, but I'd rather hear the official number. I tried looking it up using machinist literature, but not being a machinist myself, it was like a foreign language.

Your "machinist" should already know about things like interference fits.... mine does.

You might want to look until you find one (or a shop) that does. Whoever does machining work for your area's racers would be a good place to start.

If that's not an option, call your local bearing supplier.
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Old 11-19-2012, 08:57 AM   #8
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I agree, but I'm not really taking the hub to a machinist in the conventional sense. My dad works in a machine shop that manufactures high-tech parts for the steel industry and he's going to have one of the machinists there turn it for me. I'm sure that the machinist that will do it is a skilled guy, but steel mill components and motorcycle wheels probably have enough differences in machining tolerances that I'd like to be able to ask for a specific clearance rather than leave it up to the machinist's judgement.
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Old 11-19-2012, 09:01 AM   #9
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Originally Posted by TheRadBaron View Post
Man, I opened that document and it's pretty esoteric stuff (to a non-machinist). I know that I could spend the time and get sufficient reference data that I could understand it, but I'd really rather not .
As far as the measurement that you gave me, am I correct in taking that as meaning that I should have 0.012" (12 thousandths) of interference? This seems excessive to me. Did you mean 0.0012"?

Dimensions are in millimeters, 0.012mm = 0.00047"

I work in mm all the time, and REALLY dislike mixed measuring systems

There's a couple charts in the midst off all that info that give the tolerances
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machinebuilder screwed with this post 11-19-2012 at 09:03 AM Reason: fix typo
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Old 11-19-2012, 09:03 AM   #10
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Quote:
Originally Posted by TheRadBaron View Post
I have a rear hub from a Yamaha XT500 that I'm preparing to have some machining done. I need to machine the 40mm wheel bearing bores out to 42mm. What is the recommended interference fit for a wheel bearing? I'd like to have a definite diameter to tell the machinist.
I know that I could get an idea by measuring the the hub that I have, but I'd rather hear the official number. I tried looking it up using machinist literature, but not being a machinist myself, it was like a foreign language.
let the machine shop determine clearance. take actual bearing in along with hub. any reputable machine shop has done this before.
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Old 11-19-2012, 09:24 AM   #11
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Dimensions are in millimeters, 0.012mm = 0.00047"

I work in mm all the time, and REALLY dislike mixed measuring systems

There's a couple charts in the midst off all that info that give the tolerances
Duh, I should have been able to figure that out. I was fixated on the "inch" system of measurement since that's the way it usually gets discussed. Thanks for the good info.
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Old 11-19-2012, 04:52 PM   #12
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Originally Posted by TheRadBaron View Post
Duh, I should have been able to figure that out. I was fixated on the "inch" system of measurement since that's the way it usually gets discussed. Thanks for the good info.

Any time, I deal with similar stuff on machine tools daily, so to me what is common sense is more like rocket science to many.

Besides the only really stupid question is the one not asked.
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