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-   -   shaft\coupling tolerance (http://www.sailnet.com/forums/gear-maintenance/75770-shaft%5Ccoupling-tolerance.html)

drobarge 06-29-2011 10:39 PM

shaft\coupling tolerance
 
I am replacing the propshaft coupling on my v drive. The propshaft is not a standard size and I need to have the coupler machined to a very slightly larger bore size. What should the tolerance between the propshaft and coupler bore be within?

Thanks

drobarge 06-29-2011 10:43 PM

+ .001 -.000 ? or is greater acceptable?

JimsCAL 06-29-2011 11:00 PM

Connection between the shaft and coupling is usually a taper.

drobarge 06-29-2011 11:19 PM

Fairly certain this is not tapered. nonsuch 30 westerbeke 27 V drive

mitiempo 06-30-2011 01:30 AM

I believe it is a press fit.

Maine Sail 06-30-2011 06:36 AM

It should be a light press fit if this is a straight coupling. It should NOT just slide over the shaft easily.. This fit is usually fitted by hand by the machine shop. I would suggest using a "split" coupling then the fit is not quite as critical but it should still be pretty snug on the shaft.

drobarge 06-30-2011 05:30 PM

Ahhh forget it!
hauling boat, replacing shaft and all.

Thanks for the help though!

centaursailor 06-30-2011 05:42 PM

A properly sized taper lock coupling should not present any difficulties . The taper lock bore is designed to tighten on the shaft as the taper is driven into the coupling via grub screws. Some systems also use a key to deliver the drive but that must be machined into the shaft.
Safe sailing


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