×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Split coupling

Split coupling

Split coupling

(OP)
I am designing a brass split coupling to be used in a four jaw chuck to prevent damage to a shaft from the jaws while the shaft is being turned.  The OD of the shaft is 2.5590 +/- 0.0001. If I am going to make the split in the coupling 0.125, will it be okay if I make the ID of the coupling 2.565 or should I make it slightly larger?

RE: Split coupling

Considering the amount of clamping pressure that is going to have to be applied to the coupling to keep the shaft from moving during the machining operation, I would say that the maximum ID for the coupling should be 2.5589".

I am assuming that the split coupling you are talking about is two-piece.  That, and I am assuming that you need a slight interference fit on the shaft as to eliminate any chatter or movement during the machining operaton.

Your tolerance = 2.5590 +/- .0001
Maximum Mat'l Condition of shaft = 2.5591
Minimum Mat'l Condition of shaft = 2.5589

You must accomodate the minimum mat'l condition in order for your coupling to be useful in all situations.  

RE: Split coupling

I've done this a number of times - you don't have to make it two piece - just use one slit, its easier to handle. If it has a relatively thin wall, say 1/4", you can get away with two or three thousanths clearance - it will close up OK.

RE: Split coupling

Hi eaglet

When I had a situation such as yours where a part had to be
protected from damage, I used to remove the standard jaws
and replace them with soft mild steel blank ones,which after
centralising were bored out to the component size.


regards desertfox

RE: Split coupling

(OP)
Thanks to everyone for their input.  I am going to use a coupling with a single split on one side.  I am also looking into purchasing some smooth, mild steel chuck jaws.

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!


Resources