It has been said many times about having the correct torque for wheels etc, so when at a closing down sale i saw this wrench and it looked good i bought it.Its in M-KLG and ft-lbs and made by PROTO MODEL 6016.Is there anybody out there that can advise .To see whether it has been corrected i done a test from a guy on the internet but got nowhere.Iset it at its lowest (30 lb) and it clicked once in the vise i had it in. I then set it to 150 lb and it also clicked once. Now to me i thought these things clicked when they reached the chosen torque so then i tried my caravan wheel , i undone it and tightened it to 30 lb and it clicked once, tried it at 64lb after loosening it first and it still clicked once . Have i bought a lemon?.Appreciate comments.PS the nut was same tightness for both 30/150 lb.
Torque wrenches
- Thread starter Robert_374373903
- Start date
Robert,
The click you hear is the sound of the internal clutch releasing when it reaches the user-set limit.
So when you set it to 30NM, it'll click once when it reaches 30NM - if you set it to 90NM, it'll still click once when it reaches 90NM - but you should have noticed it took three times the effort for the clutch to release.
Robert
You can check the calibration with a set of bathroom scales and a ruler. Set the wrench to say 50NM, measure the length of the wrench - use the vice to restrain the working part of the wrench and press the bathroom scales on to the end of the wrench until it releases and record the kg...
1 kg applied at a distance of 1 metre is 9.8 NM...
If your torque wrench is 1/2 metre long, you need to apply a force of 100 Newtons to generate 50NM - and 100 Newtons is about 10 kg on the bathroom scales.
The click you hear is the sound of the internal clutch releasing when it reaches the user-set limit.
So when you set it to 30NM, it'll click once when it reaches 30NM - if you set it to 90NM, it'll still click once when it reaches 90NM - but you should have noticed it took three times the effort for the clutch to release.
Robert
You can check the calibration with a set of bathroom scales and a ruler. Set the wrench to say 50NM, measure the length of the wrench - use the vice to restrain the working part of the wrench and press the bathroom scales on to the end of the wrench until it releases and record the kg...
1 kg applied at a distance of 1 metre is 9.8 NM...
If your torque wrench is 1/2 metre long, you need to apply a force of 100 Newtons to generate 50NM - and 100 Newtons is about 10 kg on the bathroom scales.
Thank you for info.When you say i should have felt an increase of exertion for the greater measurment this is what i could not understand as it did not require any more. So i will do your test tomorrow and keep my fingers crossed.
Robert, if, as you found, the nut was the same tightness for both 30 & 150 ft.lb.settings, I would be inclined to think the wrench was faulty.
Hello Robert.
It always concerns me when somebody posts a question like this one. Sadly I have to conclude that you do not understand how to use the tool properly, and as a consequence, you may well incorrectly tighten your wheel nuts, which may make them prone to working loose, or other problems associated with over tightening.
If the wrench was new, it should have a set of instructions, if it was a general used tool from a workshop then you do not know it history, or whether it has been abused.
There is also the uncertainty if the wrench is actually working properly, or how accurately it can be set, though Rob-Jax has suggested a simplified test method.
Until you have established beyond doubt that you know how to use the tool and understand its operation, and that the tool has been confirmed as working correctly I would be very suspect of using it on any safety critical components, or where high value equipment might fail if the wrench is faulty. E.g. wheel nuts, tow balls cylinder heads etc
It always concerns me when somebody posts a question like this one. Sadly I have to conclude that you do not understand how to use the tool properly, and as a consequence, you may well incorrectly tighten your wheel nuts, which may make them prone to working loose, or other problems associated with over tightening.
If the wrench was new, it should have a set of instructions, if it was a general used tool from a workshop then you do not know it history, or whether it has been abused.
There is also the uncertainty if the wrench is actually working properly, or how accurately it can be set, though Rob-Jax has suggested a simplified test method.
Until you have established beyond doubt that you know how to use the tool and understand its operation, and that the tool has been confirmed as working correctly I would be very suspect of using it on any safety critical components, or where high value equipment might fail if the wrench is faulty. E.g. wheel nuts, tow balls cylinder heads etc
I agree with your comments and would not use it on my car/caravan until i find it working . Anyway thanks for comments from all.
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