×
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 Connections

Threaded Connections

Threaded Connections

(OP)
Greetings! I have a question that maybe you can answer. I will try the best to explain below.

I have a hub with through holes in a circular pattern located on flat surfaces that are milled. There is a connector bar that has tapped holes that are placed at a 4 degree pitch to the top face.

Can someone tell me the benefits of a threaded hole that is at a 4 degree pitch with a thru hole that is straight through? I feel this is causing major issues in assembly and other engineers feel the same but one engineer will not say why this is supposed to be this way. I may need to upload a "SAMPLE" print for you to see what Im talking about.


Thanks!

Justin

RE: Threaded Connections

Yes, please do so (upload a print).

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:

To an Engineer, the glass is twice as big as it needs to be.

RE: Threaded Connections

Do you mean that the axis of the threaded hole in the clamp/connector bar is 4̊ out of/away from perpendicular to the milled surfaces on the hub? Could this be an attempt to provide a bolt locking means, when the bolt if fully tightened and the connector bar is drawn tight. This will tend to bend the bolt a bit and deform the threads too. Maybe locking the bolt in place.

RE: Threaded Connections

I don't like it. There should be a very good explanation for it. For all I can see, all it does is create undue stress on the screw, which would lead to premature failure. If a self-locking thread is desired there are many better ways to do it. Frankly it sounds like a screw up, either in design or in fabrication, to me.

RE: Threaded Connections

(OP)
Thank you gents for all your responses, I hope you can see the attached file.

RE: Threaded Connections

Hi Justin,

got a 404 error on the pdf.

Is the "connector bar" circular too?

Kind of like a belleville washer perhaps?

RE: Threaded Connections

(OP)
The connector bar is square.

RE: Threaded Connections

You have to upload the file Pitched and same problem with PDF, 404 error.

RE: Threaded Connections

Hi Justin,

I pictured a "nut plate" square/rectangular in cross section, but curving around to include several of the threaded holes, like a big washer, possibly cut into a few "C" sections.

Upon tightening such a thing with skewed holes the action >>might<< be similar to a belleville washer but at the poor bolts' expense and health.

http://upload.wikimedia.org/wikipedia/commons/7/77...

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