Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Type of tolerance fit

Type of tolerance fit

Type of tolerance fit

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close