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Checking a Torque Wrench

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Kiwi_Roy:
I know there are probably many firms out there that will check the accuracy of a torque wrench;

Give us a few cheap and dirty ways to check them at home,
The obvious way is against a known weight on a lever but if you don't have that, then what.

I ask because I have 2 reading quite a bit different, like 30%

rodekyll:

--- Quote from: Kiwi_Roy on March 17, 2015, 12:05:23 AM ---I know there are probably many firms out there that will check the accuracy of a torque wrench;

Give us a few cheap and dirty ways to check them at home,
The obvious way is against a known weight on a lever but if you don't have that, then what.

I ask because I have 2 reading quite a bit different, like 30%

--- End quote ---

We used to get one guy in the shop to pay for his calibration and then we'd hook his wrench up to ours and see if they clicked at the same time.  If they needed adjusting we'd buy his beer.

Sasquatch Jim:
  I have a square hole socket that allows me to mate up my pointer indicater wrench with my click type wrench.
  Grab the handles firmly and torque ad read the needle when the other clicks.

 BTW, with click types you should return the vernier to zero after use.

Chuck in Indiana:

--- Quote from: Sasquatch Jim on March 17, 2015, 02:59:57 AM ---  I have a square hole socket that allows me to mate up my pointer indicater wrench with my click type wrench.
  Grab the handles firmly and torque ad read the needle when the other clicks.

 BTW, with click types you should return the vernier to zero after use.

--- End quote ---

 :+1

acogoff:
     I use a somewhat accurate fish weight scale. Hook a strong cord 12 inches out from the centerline of you socket and pull with the fish scale. With some simple math you can figure what the scale should read as the torque wrench clicks. You can use a section of pipe around the handle and get say 3 feet away from the centerline for the higher settings. Using the 3 ft. set up applying 20 Lbs 3 ft away gets you 60 ftlbs at the nut you are doing up. The same principle applies be it Ft lbs or inch lbs, just use some math. Just use a vise to hold the square bit of your wrench while calibrating.

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