Type of tolerance fit

[pnkjrao]

I would be happy if someone can educate me on what type<br>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<br>to hoist a rescue boat.<br><br>eg sliding fit/force fit/etc

 

[ecampos]

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

 

[BIMMER]

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

 

[diamondjim]

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