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02-15-2012, 09:58 AM
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Join Date: Jan 2007
Location: Orem, UT
Posts: 213
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Torque Wrench Question
The LONG discussion about torque wrenches reminds me of some questions that I've wondered about. I have two torque wrenches (cheap and expensive)
Is there a way that I can use wrench B to test the torque applied by wrench A?
Or, can I use my wrench that's newly calibrated to test the torque applied to a nut before calibration? (I'd check the last nut torqued before calibration to see if it was okay. If it was, I wouldn't bother to go back and re-torque everything.)
Or, can I use my basic torque wrench to test the torque applied when I use the device discussed in the LONG thread to see if 0.8 really is the correct value?
Or in general, do I just trust my torque wrench or is there a way I can test it?
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Finishing -12 tail cone
-9A Empennage done, in storage
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02-15-2012, 10:07 AM
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Senior Curmudgeon
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Join Date: Sep 2005
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Mike Starkey
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Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
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"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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02-15-2012, 10:09 AM
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Join Date: May 2009
Location: Woodbury, MN
Posts: 53
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$20,575.90????
Maybe we could get $5 off with a group buy...
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Gary Hall
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02-15-2012, 10:16 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
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A bit hokey, but if you welded two cheap sockets together at their nut ends you could use the known good torque wrench to calibrate the other.
If the two wrenches are end-to-end the the exact same torque will be applied to both. The readings can then be compared.
Of course, this only works if one is known good, or has an exact calibration chart.
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
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La Cholla Airpark (57AZ) Tucson AZ
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02-15-2012, 10:51 AM
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Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 747
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calibration
I just use a scale or better yet weights.
Weight x Arm = Moment
Set the wrench to the value you want to test. Divide that torque value by the arm. Apply weight or force to the correct location on the wrench and test. Start with a weight lower than correct and sneak up on the correct weight.
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Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
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02-15-2012, 10:59 AM
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Join Date: Aug 2010
Location: Wichita, KS
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Quote:
Originally Posted by az_gila
A bit hokey, but if you welded two cheap sockets together at their nut ends you could use the known good torque wrench to calibrate the other.
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Don't even have to go that far. If you have two 1/4" drive toraue wrenches, use a 1/4" socket that is 1/4" drive on the ratchet end. Similar with any other combination of wrench drive sizes.
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Kurt W.
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Last edited by krw5927 : 02-15-2012 at 11:02 AM.
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02-15-2012, 11:09 AM
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Join Date: Mar 2007
Location: Sonoma County
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Quote:
Originally Posted by krw5927
Don't even have to go that far. If you have two 1/4" drive toraue wrenches, use a 1/4" socket that is 1/4" drive on the ratchet end. Similar with any other combination of wrench drive sizes.
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Then use a beam wrench to calibrate the click wrench. I have 1/4, 3/8 and 1/2 inch beam wrenches...... never need calibration, but hard to use.
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VAF #897 Warren Moretti
2019 =VAF= Dues PAID
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02-15-2012, 12:02 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by krw5927
Don't even have to go that far. If you have two 1/4" drive toraue wrenches, use a 1/4" socket that is 1/4" drive on the ratchet end. Similar with any other combination of wrench drive sizes.
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Err... square drive vs. a hex bolt end.... 
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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02-15-2012, 01:58 PM
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Join Date: Feb 2012
Location: Parker, AZ
Posts: 37
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Another beautiful day in paradise....N2977T
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02-15-2012, 02:08 PM
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Join Date: Oct 2007
Location: Mission Viejo, CA
Posts: 212
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Torque comparator
I have a Snap-on TCR175 torque comparator mounted on my Snap-on truck as a free service to my customers. If their torque wrench is not within specs. I send it in for calibration.
Check with your local Snap-on dealer and ask if they have one (not all do). If you're in the San Clemente/Dana Point, CA area you're welcome to use mine.
http://buy1.snapon.com/catalog/item....store&tool=all |
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