×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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

Failure due to torque

Failure due to torque

Failure due to torque

(OP)

How would I go about finding the max torque that can be applied to 2 jack screws to free up a stuck acrylic plug without causing the flange on the plug to fail?

RE: Failure due to torque

Hi

Well it might help if you show us where you intend to apply the jack screws and the material strength of the material you are dealing with. A sketch would help enormously showing where this thing is actually stuck.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

RE: Failure due to torque

As per my understanding, you want to apply torque on the any of 2 screws of shared image acrylic product flange to remove it from some sort of part/assembly below it when its stuck on the part. This is very little information to suggest anything. More detailed information is needed.

You need to consider the weight that is supported by this flange + acrylic product weight, lets call it W. The you need to overcome frictional force = coefficient of friction between the acrylic produce and surface of part on which it sits*W to move it. Based on this you can calculate the torque=force*distance up to screw from center if torque applied at center and not on the screws.

RE: Failure due to torque

Any idea what caused the plug to become stuck? It sounds like it's less a friction problem, and possibly more of an adhesion problem, or did the plug get cocked sideways and jam? Irregardless, if it were me, I would get a new one ordered or start machining a replacement...and then not waste time on analysis, just go ahead and try to jack it out carefully and slowly advancing a screw in each (4x?) of the tapped holes, and have a couple of drills and taps (and a hammer and chisel) on hand to tap the body of the plug to pull it once the flanges have snapped off, and then drill the remainder of the plug out when the body shatters, and carve out the remainder with hammer and chisel.

RE: Failure due to torque

It seems to me that if you really want to preserve the flange, then you need to spread the load out and use as many screws as practical and "walk" the plug out by making the same number of turns on diametrically opposed screws. You'll be able to see if the flange is going to go south if it starts bending significantly. WD-40, etc., might help, along with some gentle, or not-so-gentle, nudging/impacts.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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