×
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

Threaded flange affixing

Threaded flange affixing

Threaded flange affixing

(OP)

I have a question regarding affixing a threaded flange to a shaft.

The flange is the end element of a hydraulic cylinder transfering the axial force. The flange and shaft have a threaded connection.

My question is related to the method fixing the flange in position on the thread. Currently the idea is to use a pin as illustrated in the very crude sketch accompanying the post. (If it´s unclear I can make a more precise sketch but I have nothing better than paint on hand at the moment)

What worries me is that I have never seen an example of such a connection, and I´m doubtfull a pin can be used to secure a threaded connection.

The connection is mainly loaded axially with very little tangential stress, and must be easy to dismantle. The axial forces are approximately 100 tons. I have tried searching the forum and internet in general bu I am apparently asking the wrong question. I would be grateful on any advice given.

 

RE: Threaded flange affixing

Why don't you delete the threads and turn down the end of the shaft.  Then add a small hub to the flange that would mate up against the shoulder where the shaft was turned down.   Then use the pin just to take the tangential loading.   Then you don't have the complications of the threads and you can easily figure out the load on the shoulder of the shaft.

By the way I am a chemical engineer so I might be way off on this.


Regards
StoneCold

RE: Threaded flange affixing

(OP)
Ok, but suppose I really have to work with a threaded connection.

RE: Threaded flange affixing

The ID of the flange is threaded to match the end of the shaft?

I can't make much of your sketch.

How about just a jam nut?

RE: Threaded flange affixing

(OP)
Yes.. the flange and shaft have corresponding threads.

I was also thinking of using a locking nut, it seems a logical solution.

Along that line is there a way to quantify the safety provided by the locking nut.

But just for future reference does anyone know if it is even possible to use something like a safety pin for securing a threaded connection.  

RE: Threaded flange affixing

Were you thinking of attempting to drill a hole that's half in the shaft and half in the flange, then drive in a roll pin or a solid pin?

It can be done, but:

It's hard to do.

It's ugly.

It's a custom match, and if it ever does get taken apart it won't line up again.

 

RE: Threaded flange affixing

(OP)
Thanks.

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