I know you can use an extension on the socket end of a torque wrench, you just have to use a formula to figure out what to set the torque for on the handle. My question is could you use an extension on the handle, a cheater bar like you use on a regular ratchet wrench or breaker bar? If so would you still use the same formula to figure out what to set the torque on the wrench to to obtain your desired torque at the ratchet end? Seem to be getting weaker in my old alder age and 110 to 200 ft/lb torques are getting a little rough on the body.
- Thread starter wsmm
- Start date
Ken Macfarlane
Well-known Member
No adjustment needed, the torque is read/clicks the same at or near the head regardless of how long the cheater handle is.
Also, no need for correction using an extension. There is no loss of torque through them.
Also, no need for correction using an extension. There is no loss of torque through them.
Steve in VA
Well-known Member
- Location
- Natural Bridge Virginia
Since you reference a breaker bar, then I assume that by 'extension', you mean one that is parallel to the torque wrench and actually extends the reach of the bar. If I'm wrong and you mean an extension that is perpendicular to the wrench, then no calculation is needed.
So, if:
L is the length of the torque wrench measured between the handle and the pivot.
A is the distance between the pivot and the socket.
T is the desired or applied torque.
The setting on the wrench is: S = T[L/A + L]
Since the moment arm is increased by effectively increasing the length of the wrench, the setting of the wrench should be a lower value than the desired torque.
Help?
So, if:
L is the length of the torque wrench measured between the handle and the pivot.
A is the distance between the pivot and the socket.
T is the desired or applied torque.
The setting on the wrench is: S = T[L/A + L]
Since the moment arm is increased by effectively increasing the length of the wrench, the setting of the wrench should be a lower value than the desired torque.
Help?
Steve in VA
Well-known Member
- Location
- Natural Bridge Virginia
After re-reading your original post, I don't believe that the given formula will work if you add the 'extension' to the handle. If your premise is to add an extension to the handle end of the torque wrench rather than the pivot end in order to gain mechanical advantage, then no adjustment of the wrench setting is needed.
Sorry if this is getting confusing.
Sorry if this is getting confusing.
Adirondack case guy
Well-known Member
My conclusion also, if he is considering the "cheater" like one would put on the handle of an OC chain binder.
I'm also presuming the poster is using a clicker styled torque wrench, and not a dial indicator style with the sweep arm, which requires the grab handle part to pivot on a pin.
The first pic is of a specialized wrench to torque head bolts on some engines, It doesn't change the torque to the bolt, but if you put on a crowfoot like in second pic. the torque applied to the bolt will vary according to the angle of offset to the pivot point of the torque wrench. Some rather complicated math.
Loren
I'm also presuming the poster is using a clicker styled torque wrench, and not a dial indicator style with the sweep arm, which requires the grab handle part to pivot on a pin.
The first pic is of a specialized wrench to torque head bolts on some engines, It doesn't change the torque to the bolt, but if you put on a crowfoot like in second pic. the torque applied to the bolt will vary according to the angle of offset to the pivot point of the torque wrench. Some rather complicated math.
Loren
Adirondack case guy
Well-known Member
Just a bit more. The top "clicker" style will work with a cheater pipe. The lower style will not work, and not pictured the high end torque wrenches with the broad frame work with a round dial indicator, will not work with a cheater.
Loren, the Acg.
Loren, the Acg.
retired farmer
Well-known Member
Do Not use a cheater pipe on a torque wrench. Get you a torque multiplier and put between the socket and torque wrench. I got mine from Snap On Tools.
blue water massey
Well-known Member
Lauren in IOWA
Member
I bought a torque wrench that is 41 inches long and goes to 600 pounds. Makes it easy to get it right.
Super-H-Mike
Member
Here is a nice easy to understand chart from a Ford service manual, I hope it is legible enough.
Similar threads
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.
Copyright © 1997-2024 Yesterday's Tractor Co.
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.
Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy