Torque wrench Question, mathmaticaly speaking.............
Thread Starter
Melting Slicks
Joined: May 2002
Posts: 3,161
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From: Beverly Hills Florida
CI 7-8 Veteran
Torque wrench Question, mathmaticaly speaking.............
With a 1/2 inch dial type wrench, does adding a 3 inch extension change the torque specs + or - any??? It's been 21 years since shop class, and heck just now using one. :eek:
Le Mans Master
Joined: Jan 2003
Posts: 8,596
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From: Portland Oregon
Re: Torque wrench Question, mathmaticaly speaking............. (INaband)
If your extension is a good quality there generally isn't any flex in it. To be safe and if it is in question I used to add 1 ft/lb per inch.
Drifting
Joined: Oct 2003
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From: CALGARY ab
Re: Torque wrench Question, mathmaticaly speaking............. (tjwong)
If your extension is a good quality there generally isn't any flex in it. To be safe and if it is in question I used to add 1 ft/lb per inch.
the propose of a torgue wrench is designed to used as is: by adding an extention, does not increase the torque value, it just get to that value quicker. do not use any extension..for proper results, use only the specific size /value for its application!
Melting Slicks
Joined: Apr 2000
Posts: 3,198
Likes: 2
From: Northern CA
Re: Torque wrench Question, mathmaticaly speaking............. (INaband)
You're talking about adding an extension at the ratchet end right... such as a crowsfoot socket? The answer is yes, the measured torque does change. I'm sure someone will post the formula.
Heel & Toe
Joined: Mar 2003
Posts: 23
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From: New Port Richey Florida
Re: Torque wrench Question, mathmaticaly speaking............. (INaband)
The formula is
actual torque X wrench length divided by wrench length + adapter length
= adjusted wrench value
please also note that if the adapter is located at 90 degrees to the torque wrench handle no adjustment is required.
Bruce, 94 Black Rose 6sp Z07
actual torque X wrench length divided by wrench length + adapter length
= adjusted wrench value
please also note that if the adapter is located at 90 degrees to the torque wrench handle no adjustment is required.
Bruce, 94 Black Rose 6sp Z07
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: Torque wrench Question, mathmaticaly speaking............. (INaband)
Yup.. a socket extension will not affect the torque readings.. it'll actually make it easier to apply true torque to the nut, not torque + shear.
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: Torque wrench Question, mathmaticaly speaking.............
Adding an extension to the handle, like a steel tube, won't affect the torque reading either. It'll just make it easier to apply that torque. But if you need an extension to crank on something, you're probably exceeding the torque wrench's capabilities anyways.
Like the previous guy said, the torque reading needs to be refigured if you're using a crow's foot..... Or.. if you're using U-joints or wobblies.
Basically, if the rotational axis of the torque wrench's ratcheting end isn't inline with the rotational axis of the nut/bolt, you need to use calculations.
[Modified by CentralCoaster, 5:07 AM 2/20/2004]
Like the previous guy said, the torque reading needs to be refigured if you're using a crow's foot..... Or.. if you're using U-joints or wobblies.
Basically, if the rotational axis of the torque wrench's ratcheting end isn't inline with the rotational axis of the nut/bolt, you need to use calculations.
[Modified by CentralCoaster, 5:07 AM 2/20/2004]
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Instructor
Joined: Sep 2002
Posts: 210
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From: Southfield Michigan
Re: Torque wrench Question, mathmaticaly speaking............. (CentralCoaster)
Twist in a extension won't lower the torque applied? Or is it just too small to even count?
Example. Put a extension on your impact gun and try and take off a lug nut. If it does not come off remove the extension and it will take the lug off. That or maybe I just have cheap extensions.... well I do have cheap extensions but they get the job done.
Example. Put a extension on your impact gun and try and take off a lug nut. If it does not come off remove the extension and it will take the lug off. That or maybe I just have cheap extensions.... well I do have cheap extensions but they get the job done.
Advanced
Joined: Dec 2003
Posts: 75
Likes: 0
From: Lenexa KS
Re: Torque wrench Question, mathmaticaly speaking............. (BookSmart)
Any twist in a socket extension will not change the torque applied by the torque wrench. The impact wrench example is not on point. The key word there is 'impact'. Twist in a extension on an impact wrench will reduce the peak impact torque applied to the socket at the end of the extension. Torque applied by a torque wrench is a steady rotating force rather than an impact so any twist in the extension will simply make the selected torque value occur a little further around the clock.
Race Director
Joined: Feb 1999
Posts: 12,772
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From: Indianapolis IN
Re: Torque wrench Question, mathmaticaly speaking............. (Jim Sitton)
I sell automated DC torquing equipment accurate to 1%, costing a minumum of $14,000 just for the torque/transducer package. We measure torque combined with angle to the degree.
We offer untis that torque from 2.2 Lb/Ft up to 108 Lb/Ft. w ww.weberusa.com
Trust me when I say that there is not enough torsional twist in a typcial 1/2 socket extension to register an amount that would matter since we torque heads etc to an accuracy of @ 5-10%.
Now if you get shome cheap lossy goosy sockets and make them a couple of feet long then you could have some play, but you notice tha tthe specs always call for something like 40-45 Ft/lb etc so they are telling you that it could be within 10%
A foot pound of torque is the twisting force necessary to support a one pound weight on a weightless horizontal bar, one foot from the fulcrum.
[Modified by ld85, 10:21 PM 2/20/2004]
We offer untis that torque from 2.2 Lb/Ft up to 108 Lb/Ft. w ww.weberusa.com
Trust me when I say that there is not enough torsional twist in a typcial 1/2 socket extension to register an amount that would matter since we torque heads etc to an accuracy of @ 5-10%.
Now if you get shome cheap lossy goosy sockets and make them a couple of feet long then you could have some play, but you notice tha tthe specs always call for something like 40-45 Ft/lb etc so they are telling you that it could be within 10%
A foot pound of torque is the twisting force necessary to support a one pound weight on a weightless horizontal bar, one foot from the fulcrum.
[Modified by ld85, 10:21 PM 2/20/2004]
Team Owner
Joined: May 2002
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: Torque wrench Question, mathmaticaly speaking............. (ld85)
extensions, loosy goosey sockets... none of that will affect the torque applied. it will affect the twist yes, but not torque.
Now there's stretch gages that are used, and as a studying engineer.. I must say, that is the best method. :yesnod: Torque readings aren't very reliable since they depend too much on thread angle and friction, not just the clamping force of the bolt/nut itself.
Now there's stretch gages that are used, and as a studying engineer.. I must say, that is the best method. :yesnod: Torque readings aren't very reliable since they depend too much on thread angle and friction, not just the clamping force of the bolt/nut itself.
Race Director
Joined: Feb 1999
Posts: 12,772
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From: Indianapolis IN
Re: Torque wrench Question, mathmaticaly speaking............. (CentralCoaster)
extensions, loosy goosey sockets... none of that will affect the torque applied. it will affect the twist yes, but not torque.
EDIT: I am talking in minutes of degrees, so yes for every day +/- 2-3 Ft/lbs no it does not affect much
[Modified by ld85, 11:08 PM 2/20/2004]
Race Director
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Re: Torque wrench Question, mathmaticaly speaking............. (ld85)
I'm in agreement with the Coaster on this one.
Extensions or loose sockets will not affect steadily-applied torque.
Larry
code5coupe
:seeya
Extensions or loose sockets will not affect steadily-applied torque.
Larry
code5coupe
:seeya
Drifting
Joined: Oct 2003
Posts: 1,594
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From: CALGARY ab
Re: Torque wrench Question, mathmaticaly speaking............. (rocco16)
I'm in agreement with the Coaster on this one.
Extensions or loose sockets will not affect steadily-applied torque.
Larry
code5coupe
:seeya
Extensions or loose sockets will not affect steadily-applied torque.
Larry
code5coupe
:seeya