Interference Fit

[ubetcha]

I'm looking to reduce ID of sleeve that is pressed into a housing. But I don't want to crush the sleeve.

The housings can be 1030 or 1050 steel and the sleeve is 1018 steel. The current sleeve is 1.281" OD at MMC, ID is 1.060" LMC, with a length of 1.25". Hole in the housing is 1.287.

This application is currently working. I'm looking to increase the ID of sleeve by as much as possible without the possibility of crushing the sleeve during installation. The numbers I've been coming up with aren't making sense. Any tips would be appreciated.

 

[MikeHalloran]

If you press a 1.281" OD sleeve into a 1.287" dia hole, well, where is the interference?

Assuming you eventually get the dimensions and tolerances sorted out, when you say you fear "crushing the sleeve", are you talking about radial buckling of a thin sleeve emanating directly from the press fit itself, or are you talking about axial buckling of the sleeve as a column from the press force?



Mike Halloran
Pembroke Pines, FL, USA

 

[GregLocock]

I think he meant OD of the sleeve... but who knows

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[rb1957]

"I'm looking to reduce ID of sleeve ...

... I'm looking to increase the ID of sleeve ..."

??

 

[Eltron]

Head over to the Misumi website and do a search for "tolerance table for regularly used fits". Maybe that will get you started.

Dan

http://www.eltronresearch.com

Dan's Blog

 

[ubetcha]

Wow I screwed that up.

Ok basically interference of .006" and I'm reducing the thickness of the sleeve. So its more likely to fail.

Could fail from either buckling from the press load or radially from the pressure of the the interference.

Thanks for your help.

 

[Wrenchbender]

You imply that the sizes of the two parts are already set (so once they are assembled, its take-what-you-get). For this size range things are tighter than an FN5 at ambient which means differential temperatures are needed for assembly; otherwise it’s probably a No-Go. I'm not smart enough to advise on any re-entrant buckling of the walls at equilibrium, but you might try to model it. Also Machinery's Hdbk has a good section on fits, and there are online calculators that may provide exactly what you want to know (e.g., engineersedge.com).

 

[Cockroach]

Is this right?

The thru hole is 1.281 ID and must fit a tube if maximum OD 1.287 inches. The width of contact is 1.25 inches. If the present tube is OD ID 1.060 inches, how much more can I increase it, i.e. Minimize the tubing wall, so that failure by collapse is not an issue?

I think this is your question, no? Hope it is not a homework assignment!

Regards,
Cockroach