How to: Calibrate a split beam torque wrench

[SnowDrifter]

Not going to discuss checking calibration or machines or anything. There are enough threads on how to do that. This is purely on how to make the adjustment itself since I've been unable to find anything that explains how


Anyhoo.... Look on the side of the torque-wrench opposite the adjustment dial. You'll see two security screws. Note that the one nearest to the head has a small hole in it. Just use a knife or a cutter to clear off the glue


In this hole is an adjustment screw. In my particular case, it was a 2mm hex key


Yeah it really is that simple. Stick the hex key in there are get to work. No lock nuts to loosen or fuss with. For me, counter-clockwise would increase the torque at which the wrench would "click". Opposite for clockwise





Hope this helps someone

 

[SnowDrifter]

I also got a detailed manual from Precision Instruments regarding calibration, repair, maintenance, and general construction of the tool. It's worth a read if you're curious about how these work


https://www.dropbox.com/s/33jskc8hy7g8gxk/Split Beam Repair Manual.pdf

 

[Contract_Pilot]

Thanks, will send my 1/2" to s.o. for 60.00 and get it done! look like a PITA!

 

[referman]

Thank you for posting the link to the PDF file, plus your post really helped. I wanted to check my calibration of my Precison C3FR250F. If it needed adjustment, then I had to figure out how to do it.
Thanks again.
The company who replace my truck tires only have torgue wrenches that are used on large truck wheels. They do not go down to 165 Foot pounds.

 

[bmwpowere36m3]

Checking calibration at home is one thing... but adjusting it is another. Considering the tools or control should be an order of magnitude more accurate than the device your adjusting.

I rather send it off to Angle every few years for $50... they go thru it, clean/lube, and calibrate.

Then again, average home-gamer, a torque wrench doesn't need to be THAT accurate.

 

[UnnPlugg3d]

Thanks so much for the thread, created an account just to thank you for the info

 

[Schurkey]

I also got a detailed manual from Precision Instruments regarding calibration, repair, maintenance, and general construction of the tool. It's worth a read if you're curious about how these work


https://www.dropbox.com/s/33jskc8hy7g8gxk/Split Beam Repair Manual.pdf

Link to the .pdf is non-functional. Claims that "the item has been deleted".

Can we get a re-posting, and fresh link?

 

[Astro_Pneumatic_Tools]

There should be an allen internal hex screw on the side along the length of the torque wrench, it might often have a dab of clear silicone, sealer or super glue over the internal hex. Use a pick to un-goop that.
Rotate the screw clockwise or counter clockwise to adjust calibration up or down, and check the reading in between. Put a couple drops of super glue on the screw head when your done.

 

[mituzuna]

Can anyone share again the Precision Instruments calibration, repair, maintenance, and general construction manual SnowDrifter shared?

 

[Chipm]

Bump, anyone have a copy of this manual?

 

[Chipm]

Ok, here are pictures of how you adjust it: the round cover midway up the handle has a dab of sealant in a hole. Pry out the sealant to reveal a 2mm hex head screw. Turn to adjust the torque at which the wrench clicks. Refill hole - I used RTV. Super easy.