Posted by fdt860 on December 04, 2021 at 00:36:34 from (90.93.199.3):
In Reply to: Why posted by SVcummins on December 03, 2021 at 22:35:13:
Because the bolt stretch is much more accurate this way.
When you are tightening a bolt, the clamping force is directly proportionnal to the bolt stretch.
When you do torque only, the variables such as amount of oil,under head surface condition, threads conditions and threads fits, give to much uncertainity on the friction factor between the bolt and the parts, and you may end up with different clamping force.
The torque and turn solution also has variables during the first torque sequence, but the torque being smaller, you have less error.
The torque and turn method also allow to have the final tightening right so the bolt is stretched up to the striction point (where it plastically elongates and will not return to initial length). That is the biggest advantage, but also why you never reuse torque and turn bolts.
This allow for very consistent clamping force, because the force does not vary much between beginning of plastic stretching and breakage. That point is totally unobtainable with torque only, because you may break half of the bolts in the head due to uncertainity of the friction factor.
If you reuse the torque and turn bolts, you may stretch them too much this time and go in the breakage zone.
All of the above also explains why the one time use made to stretch bolts have a smaller shank diameter.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
... [Read Article]
Latest Ad:
2022 John Deere 5045E, 4wd, front end loader and 3rd function with grapple. 120 hrs, 55k new, must sell
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
