View Single Post
sammyg2 sammyg2 is offline
Registered User
sammyg2's Avatar
Join Date: Aug 2000
Posts: 49,960
With all due respect, and at the risk of offending anyone accidentally, I aint buying this at all.

Unless these bolts are designed to be tightened to yield, you can torque them multiple times. If the lubrication is maintained and consistant you should be able to maintain repeatability to 10% as long as the fastener is not taken anywhere near yield. Yes, I do mechanical stuff for a living and have over $80,000 of torquing equipment in my shop.
A decent ME would design them to be taken no farther than 70% of yield unless it is a really special application.

The most anal procedure I've ever had to use was at a local nuke plant.
On turbine overhauls every case stud was removed and the ends shaved flat and parallel.
when it came time to fasten them they used an ultrasound machine hooked up to a lap top that recorded the exact stretch. Talk about overkill and a waste of money.
Old 08-31-2004, 03:27 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #50 (permalink)