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  #21  
Old 02-13-2012, 10:49 AM
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Quote:
Originally Posted by schristo@mac.com View Post
Wrench torque = desired bolt torque * (wrench length / total length)

For a wrench length (to the handle centerline) of 12" with a 3" extension you have (12 / 15) or .8
That is correct, this is why the .8 multiplier. Thanks, Allan
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  #22  
Old 02-13-2012, 10:59 AM
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Quote:
Originally Posted by Walt View Post
Allan,
Looks like a great tool, already placed my order. However, I'm no math wiz but what you're saying contradicts the standard formula when using an extension:

Wrench setting = desired torque x wrench length / (wrench length + extension length)

So I guess I don't get it either
Hello Walt;
This is sometimes a little confusing and is not as obvious as it first seems. Here is a link to a calculator that will help. Check it out, it's a nice tool. Allan
.
http://www.engineersedge.com/manufac..._extension.htm
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  #23  
Old 02-13-2012, 11:08 AM
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Quote:
Originally Posted by schristo@mac.com View Post
Wrench torque = desired bolt torque * (wrench length / total length)

For a wrench length (to the handle centerline) of 12" with a 3" extension you have (12 / 15) or .8

Im sure Im being dense, but the above seems to be confirming my original concern - that wrench length matters, and they may not all be the same.

Assuming there is some variation in length between different brands of torque wrenches, how can it be true that it doesnt matter which brand I use (assuming all are in ft lbs)?

Ready to buy as soon as my brain untangles...

P.S. just checked the informative link in the above post - that seems to confirm what I am saying. The "L" value or length of the torque wrench without the extension affects the torque that is applied. Unless ft-lbs torque wrenches are all the same length, the 0.8 factor would not seem to be a universal factor to be applied. No?

erich

Last edited by erich weaver : 02-13-2012 at 11:19 AM. Reason: update
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  #24  
Old 02-13-2012, 11:24 AM
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Quote:
Originally Posted by erich weaver View Post
Im sure Im being dense, but the above seems to be confirming my original concern - that wrench length matters, and they may not all be the same.

Assuming there is some variation in length between different brands of torque wrenches, how can it be true that it doesnt matter which brand I use (assuming all are in ft lbs)?

Ready to buy as soon as my brain untangles...

erich
Erich... You are correct, different length wrenches will require a different multiplier, not all wrenches are 12". My 1/4, 3/8, and 1/2" torque wrenches are not the same length!

Unless someone can prove me wrong mathmatically, length of the wrench does matter. The .8 only applies to a 12" wrench.

Here's an even nicer calculator to use:

http://www.freeinfostuff.com/TorqueE...eExtension.htm
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  #25  
Old 02-13-2012, 11:26 AM
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Quote:
Originally Posted by Greg Arehart View Post
I agree with Walt, the angle at which the wrench attaches to the torque wrench should make no difference - the multiplier should stay the same regardless of the angle. You still have a 15" arm rather than the standard 12" arm.

Greg
The angle actually makes all the difference. Go to the link below and scroll down to the section that reads;
C - The Extension is Not Lined up With the Wrench.
Now enter the numbers in different angles and it will become clear. Regards, Allan
.
http://www.freeinfostuff.com/TorqueE...eExtension.htm
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  #26  
Old 02-13-2012, 11:39 AM
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Quote:
Originally Posted by Greg Arehart View Post
I agree with Walt, the angle at which the wrench attaches to the torque wrench should make no difference - the multiplier should stay the same regardless of the angle. You still have a 15" arm rather than the standard 12" arm.

Greg
Just to clarify, I never said angle didn't matter, it does.
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EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
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  #27  
Old 02-13-2012, 11:55 AM
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Quote:
Originally Posted by erich weaver View Post
Im sure Im being dense, but the above seems to be confirming my original concern - that wrench length matters, and they may not all be the same.

Assuming there is some variation in length between different brands of torque wrenches, how can it be true that it doesnt matter which brand I use (assuming all are in ft lbs)?

Ready to buy as soon as my brain untangles...

P.S. just checked the informative link in the above post - that seems to confirm what I am saying. The "L" value or length of the torque wrench without the extension affects the torque that is applied. Unless ft-lbs torque wrenches are all the same length, the 0.8 factor would not seem to be a universal factor to be applied. No?

erich
This is just a case of miscommunication! Remember we are talking about foot lb. torque wrenches and yes they are all calibrated exactly the same to read in foot lbs. regardless of handle length. The longer the handle, the less force required of you to achieve your desired torque. The torque wrench is measuring the force applied to the bolt, not to the handle. If you use a 36" cheater bar on your torque wrench that only means you do not pull as hard.
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Last edited by PerfTech : 02-13-2012 at 12:55 PM.
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  #28  
Old 02-13-2012, 12:06 PM
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Default my 01 cent worth

Allan is right, the .8 was an example. The calculators work. and a wrench at 90 degrees to the extension negates the need for a correction. happy building

bird
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  #29  
Old 02-13-2012, 01:00 PM
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Quote:
Originally Posted by PerfTech View Post
Hi Erich;
The torque wrench measures foot pounds. The prop tool we made if installed on the torque wrench in a straight line increases the torque arm. To make the readings come out correct the .8 multiplier is used. Am alternative method is to install the prop wrench on the torque wrench at a 90 degree angle and use no multiplier as nothing will be dimensionally any different. All torque wrenches aren't the same length but the length change only effects how hard you need to pull to get to your desired number. All foot pound torque wrenches are the same in function and measure foot pounds regardless of their overall length. Thanks, Allan
Growing weary of this as Im sure are others, but I never read/heard Allan say that the 0.8 was only an example. The quote above from Allan's earlier post, as well as the product video, seems to say that if your torque wrench measures in ft lbs, that 0.8 is the correct multiplier. I say, (as does Walt I believe) that is not necessarily the case. Ya gotta measure the length of your torque wrench and if its not 12 inches, you better do the math or plug in the numbers to the handy calculator web site that was posted to see what value to set your wrench at when using the extension.

Do you agree Allan?

And for the record, love you man, product on order

erich
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  #30  
Old 02-13-2012, 02:14 PM
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Quote:
Originally Posted by erich weaver View Post
Growing weary of this as Im sure are others, but I never read/heard Allan say that the 0.8 was only an example. The quote above from Allan's earlier post, as well as the product video, seems to say that if your torque wrench measures in ft lbs, that 0.8 is the correct multiplier. I say, (as does Walt I believe) that is not necessarily the case. Ya gotta measure the length of your torque wrench and if its not 12 inches, you better do the math or plug in the numbers to the handy calculator web site that was posted to see what value to set your wrench at when using the extension.

Do you agree Allan?
I agree with Allan. If a cheater bar is used to extend the length of any length torque wrench...........at the handle end, then the torque value remains the same. Would we need to change settings, just because we have longer or shorter (human) arms?
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