×
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

Bolt Screw Lift Device
2

Bolt Screw Lift Device

Bolt Screw Lift Device

(OP)
How do I calculate the vertical lift capacity of a 1-inch dia. 304 S.Stl. UNC bolt?
The nut & bolt act as a lifting device and will be torqued by hand.  The action of the pitch will raise the load.  At what point should we worry about load binding?

From the mechanical forum, I have learned that without adequate lubrication, the threads will likely gall and bind.  That aside, I need a reference or equation to determine the possible lift load.
Thanks

RE: Bolt Screw Lift Device

i'd use a bolt preload formula ...

http://euler9.tripod.com/fasteners/preload.html

to relate torque to bolt load.

i'd have thought that the bolt would be able to lift it's tensile strength, in your case in excess of 80,000 lbs.  the problem you might run into is the torque to overcome static friction ...

RE: Bolt Screw Lift Device

Most helical (and push) piers used in underpinning repairs use a lift head with two bolts in tension that are used to "pull" the foundation up.  You might go to Atlas or Chance and see what kind up setup their lift heads imply in regards to axial lift (tension) capacity and a hand cranked nut on an all thread rod.

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