×
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

Pressed joint of plated part on knurled surface

Pressed joint of plated part on knurled surface

Pressed joint of plated part on knurled surface

(OP)
I have a 1/8" thick Zinc plated steel disc with a 1 1/2" hole in the middle. The hole is chamfered 2/3 of the way & has straight knurling (0.012" deep) formed on the chamfer.I need to insert a steel tube through the hole and press it down on the knurled surface to make secure joint between the tube and the disc with ability to withstand some torque.

I have not Zinc plated the tube as I am not sure if that will compromise the joint security. But it seems I need to provide surface protection on the tube. I would appreciate your inputs on this.

Thanks

RE: Pressed joint of plated part on knurled surface

Zinc plating is ductile, so it is capable of deforming during assembly operations such as this.  However, there are always limits, and it is possible that the plating could be damaged to the point where corrosion protection is limited.  I would not be concerned about the joint security.  Is there a reason why the two pieces cannot be plated after assembly?  Why not make the part just one piece instead of two that require assembly?

RE: Pressed joint of plated part on knurled surface

(OP)
Thanks TVP,

The tube was a simplification to focus on the actual problem and not bring in unnecessary details. Actually the "tube" is the pawl carrier of a one-way clutch and the forming operation integrates a total of 10 parts into a one-way clutch. So I will have to plate the pawl-carrier separately. The concern arose because the clutch torque has to be carried by the joint.

Your confidence in the joint security was very helpful. I am thinking more analytically now. The plating thickness (10 microns) is only 3.3% of the knurl depth so the parent material should get formed OK.

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