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Type of tolerance fit

Type of tolerance fit

Type of tolerance fit

(OP)
I would be happy if someone can educate me on what type
of a fit would a spur gear have on a shaft,if the gear in question is a driving gear for a one ton mechanical davit
to hoist a rescue boat.

eg sliding fit/force fit/etc

RE: Type of tolerance fit

Are you relying on the press fit to transfer the load from the gear to the shaft?  There are no splines, keys, Loctite, anything else?
If not I need more info on size of gears, ratios, speeds etc. to help you.

RE: Type of tolerance fit

I suggest a small press fit.  Aprrox. 0.0005" of press per 1" of shaft diameter.  Heat the gear to 275-300 deg F and the gear will slide right on and lock in place.  This will minimize wear that comes from a sloppy fit.  A gear puller will be needed for removal (heat may also be needed).

RE: Type of tolerance fit

I assume the bearing is the typical bolt on bearing
and the clearance would be minimal depending on the
ball size or could be roller size.  No need for preload
as this would make it that much harder to turn and also
require greater mounting surface accuracy.

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