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02-14-2012, 07:39 PM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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Quote:
Originally Posted by rvator51
Take 3 torque wrenchs, one 1 ft long one 2 ft long and ine 3 ft long. All are calibrated for 100 ft lbs torque.
So even though they are different lengths, they all put exactly the same 100 ft lbs of torque at the head.
So all three torque wrenches put exactly 100 ft lbs of torque at the head and then you add the exact same 3 " extension to them. Wouldnt the 3 " extension have the same effect on the 100 ft lbs of torque at the head on all of them?
Just saying... 
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EXACTLY!!!!!!!!
You got it perfect, Thanks, Allan
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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02-14-2012, 07:51 PM
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Join Date: Jan 2007
Location: AOTP
Posts: 192
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Quote:
Originally Posted by rvator51
Wouldnt the 3 " extension have the same effect on the 100 ft lbs of torque at the head on all of them?
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No, because it's the force you put on the end of the wrench times the distance from the end that generates that torque, it doesn't just magically appear. As the arm gets longer the force to produce 100 lb at the head goes down, and it's this force applied over the total length, wrench plus extension, that produces a torque at the extension end.
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Nauga
2004 RV-4
Last edited by nauga : 02-14-2012 at 07:54 PM.
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02-14-2012, 08:05 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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There are many publications out there that have printed it wrong I guess. It sure would be easy to prove.
After reading the last 10 pages, the only way I would use this product would be with the wrench at 90 degrees from the adapter..... easy to do with this application.
At least it's not a primer or F/P issue...................... 
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VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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02-14-2012, 08:17 PM
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Join Date: Jul 2007
Location: Warwickshire UK
Posts: 703
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Quote:
Originally Posted by rvator51
Take 3 torque wrenchs, one 1 ft long one 2 ft long and ine 3 ft long. All are calibrated for 100 ft lbs torque.
So even though they are different lengths, they all put exactly the same 100 ft lbs of torque at the head.
So all three torque wrenches put exactly 100 ft lbs of torque at the head and then you add the exact same 3 " extension to them. Wouldnt the 3 " extension have the same effect on the 100 ft lbs of torque at the head on all of them?
Just saying... 
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WRONG!!!!!!!
You got it wrong, sorry
It's already been explained correctly a few times.
The nut sees a torque of applied force * distance from handle to nut.
The wrench gauge sees a torque of applied force * distance from handle to drive end of wrench.
So correction is the ratio of those lengths.
Put the crowsfoot at 90 degrees; the lengths are the same so the correction is zero.
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02-14-2012, 08:19 PM
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Join Date: Sep 2007
Location: WA
Posts: 988
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she's a witch!
Many of these posts are pretty humorous, I wonder if I use a large red font if it will have more impact...
It is interesting to see various responses and who makes them; I must be the dumbest guy in the forum; perhaps PI really is 3.
"Who are you, who are so wise in the ways of science?"
http://youtu.be/zrzMhU_4m-g

__________________
Stephen
RV7 powered by a lycoming thunderbolt IO-390
turning a whirlwind HRT prop
with more hours flying than building... 2,430 on the hobbs!
ORCA Flight
Race 771
margarita!
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02-14-2012, 08:23 PM
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Join Date: Jan 2007
Location: AOTP
Posts: 192
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Quote:
Originally Posted by schristo@mac.com
"Who are you, who are so wise in the ways of science?"
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This new learning amazes me, Schristo. Explain again how sheep's bladders may be employed to prevent earthquakes.
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Nauga
2004 RV-4
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02-14-2012, 08:30 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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I bet there are a ton of AN bolts under and over torqued out there... 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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02-14-2012, 08:34 PM
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Join Date: Mar 2008
Location: San Diego
Posts: 457
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Larry, this is great, this is the closest I've seen to someone actually laying out a mathematical argument for a constant conversion factor.
Now my question is, if this is a good argument, why not apply to a torque wrench that reads inch-pounds. Just change foot to inch:
Quote:
Originally Posted by L.Adamson
Another way of demonstrating.
A inch lb. is the force of 1 lb., 1" perpendicular to the pivot point.
If we take 100 lbs, and set it 1" from the pivot point, then it's 100 in. lbs torque against the pivot point.
If we use a 24" or 36" wrench, we are NOT moving the 100 lbs past the 1" spot on the wrench. It remains at the 1" point. By adding a longer handle, we push with less force, to move that 100 lbs.
With the addition of the 3" tool, the 1" point (which is used for the "inch" in in/lbs. is now 4". And that's why a fraction is used. 3" & 1" remain as constants.
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If I'm following you, now you have a conversion factor of 1/(1+3), or 0.25. That is, if you want a certain torque X in-lbs at the nut, you would set your torque wrench to 0.25 X.
OK so far?
--Paul
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02-14-2012, 08:41 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Allan,
New Service Bullet
SB 2012-2-14
For everyone purchasing this wrench, do your own math calculations for torque value. 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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02-14-2012, 09:04 PM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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So tell me, wise ones...
A click wrench uses a spring and pawl, which releases when the desired torque setting is hit. This compressed spring is calibrated to match ft/lbs., which is based on one pound of force, at one foot from the pivot point. The one foot is only a measurement of force. The wrench does not have to be a foot long.
How is this spring going to know, if you're grasping the wrench at the exact same spot on the shaft. Does it care? No it doesn't! The force you apply at the handle depending on length, varies. But the spring just doesn't care. It's going to release at the setting it's set to...........which is based on one pound at one foot, for ft/lb settings.
edit: And I'm going to add a 100' extension, pulled by block and tackle, connected to a cement truck.................and the spring still won't care, or notice the difference!!!!
It will just merely click, when it reaches the set point..
L.Adamson
Last edited by L.Adamson : 02-14-2012 at 09:19 PM.
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