Thread: Shrink fitting sleeve onto shaft - how much interference??

Weeds is it just a sealing surface
No load or bearing?

If so I would almost be tempted to just cut it to a slide fit and then fit with locktite bearing fit (660)

I’ve played with a few shrink fits and Cleary I’m not the machinist in my dreams and it has usually led to swear words and beer drinking

If it’s just a sealing sleeve locktite will keep her true and solid!

The two LT230 cases that I have sleeved the intermediate shaft on I used bearing fit as I didn’t want to press/shrink fit a hardened steel collar into the ally case.
That is a much higher loading than a seal over a much smaller surface area than your 10” shaft and no problems ???

S

Wow, that's some shaft! You must have access to a healthy sized lathe to turn that. A few clues at the following:

http://www.duramax-marine.com/pdf/NCBshaftliner.pdf


https://www.practicalmachinist.com/vb/general/calculating-interference-fit-through-sleeve-339895/

Originally Posted by Old Farang

Wow, that's some shaft! You must have access to a healthy sized lathe to turn that. A few clues at the following:

http://www.duramax-marine.com/pdf/NCBshaftliner.pdf


https://www.practicalmachinist.com/vb/general/calculating-interference-fit-through-sleeve-339895/

Had to remove the tail stock stop to make it fit.

Thanks for the links.

Jeez mate....12mm machined off? thats a lot of wear.

what speed are you turning it at? big load on tailstock.

Originally Posted by ramblingboy42

Jeez mate....12mm machined off? thats a lot of wear.

what speed are you turning it at? big load on tailstock.

6mm off the radius.....need a decent thickness on the sleeve.

Oh, this job is beyond me, I’m just the supervisor, not sure what speed and yes big load on the tail stock.

Given the shaft is hollow (the Maxine gets fed through the centre of the shaft) we did pretty good with welding a plug in one end for the centre.

The shaft is pretty banged up...

we’ve had to chase the threads and need to make a LH and RH nuts as well.

the only thing I can think of that uses shafts like that is a dragline.

it's years since I was involved in heavy mining maintenance.

where I did my time we had a 3' swing lathe with a 40' bed and a planer with a 40' bed , plus some big vertical and horizontal borers and a big slotter to cut keyways.

it was always interesting when something large was being machined.

Originally Posted by ramblingboy42

the only thing I can think of that uses shafts like that is a dragline.

it's years since I was involved in heavy mining maintenance.

where I did my time we had a 3' swing lathe with a 40' bed and a planer with a 40' bed , plus some big vertical and horizontal borers and a big slotter to cut keyways.

it was always interesting when something large was being machined.

Classifier or air separated...fine limestone enters the classifier through the centre of the shaft.

Accepts head off to the silo and the oversized goes back around to the mill.

Originally Posted by ramblingboy42

Jeez mate....12mm machined off? thats a lot of wear.

what speed are you turning it at? big load on tailstock.

Given the shaft diameter, if using carbide tooling then up to around 60 MPM would be ok, so up to 85 RPM I guess. Nearest on my lathe would be 54 RPM so I’d use that (mine lathe would take that shaft - just in length I think, it’s about the same size as the one in the pic) would give just over 44 MPM which would work I think.