I have a Precision Instruments M2R100FX torque wrench that I would like to check the calibration on; how should I go about doing this? I was thinking of either buying or renting a digital torque adapter and testing it that way, if possible. Would it be better to buy or rent a torque adapter to check the calibration? If I was to buy one, I would probably be looking at a Proto 6280TA100. Any help would be greatly appreciated!
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Torque Wrench Calibration Check
- Thread starter PDub88
- Start date
I traded parts for tools with a Snap-on truck driver. He had a gauge to check the torque wrench I traded for and my old one. Both were right on the money. My suggestion would be to befriend a person he sells professional tools. I bet he would have a tester.
4 Ever-Fish N
Well-known member
Curious what you find out. Also, some auto parts stores rent tools. Not sure if they would have what you're looking for.
Depending on your required level of accuracy. A attach a one foot beam to the head, add a string and start adding weight.
If you want to do it correctly, you have to account for the weight of the beam, the little bit of mass that is on the side opposite the weight, the deflection of the beam, and the distance from the pivot to the sting has to be precise. Also your weights need to be calibrated. All in all it is really hard to be precise with this method unless you have a lab, but it is easy to know if you are in the right range.
Most decent size towns have a cal lab. Around $65 bucks and you will know it is right.
If you want to do it correctly, you have to account for the weight of the beam, the little bit of mass that is on the side opposite the weight, the deflection of the beam, and the distance from the pivot to the sting has to be precise. Also your weights need to be calibrated. All in all it is really hard to be precise with this method unless you have a lab, but it is easy to know if you are in the right range.
Most decent size towns have a cal lab. Around $65 bucks and you will know it is right.
Rustypigeon
Well-known member
I have a Harbor Freight digital torque adapter that has been very accurate. I use this to check for any torque differences on my torque wrenches.
Now you are asking, how do you know that your HF digital torque adapter is accurate? I check it against my Precision Instruments dial torque wrenches and there is always less than 1% difference between the two. I also have verified it by hanging a carefully measured weight along a carefully measured breaker bar and used the formula to determine what the torque adapter should read. It is dead on.
The HF digital torque adapter says it has a torque range of 29.5-147.6 ft/lbs but mine reads dead on down to 5 ft/lbs when compared to my Precision Insturments 0-25 ft/lbs dial torque wrench.
Now you are asking, how do you know that your HF digital torque adapter is accurate? I check it against my Precision Instruments dial torque wrenches and there is always less than 1% difference between the two. I also have verified it by hanging a carefully measured weight along a carefully measured breaker bar and used the formula to determine what the torque adapter should read. It is dead on.
The HF digital torque adapter says it has a torque range of 29.5-147.6 ft/lbs but mine reads dead on down to 5 ft/lbs when compared to my Precision Insturments 0-25 ft/lbs dial torque wrench.
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HoosierBuddy
Well-known member
In another life I was tasked with this same sort of thing, where the question always became "Well how do you know the tester that you used to test the tester that you used to test the tester is accurate?" Maddening.
A foot is defined as .3048 Meters. The meter is defined as as the length of the path traveled by light in a vacuum in 1/299792458 second....So yeah...as long as you have some light and a stop watch you can check that.
And...again the standard for pounds is a fractional number of Kilos. And a kilo is defined based on a prototype kilogram kept at the International Institute of Standards in France...so you'll need to borrow that bad-boy to do this right.
Here is an excellent video that discusses the same thing. Love it!
Phil
A foot is defined as .3048 Meters. The meter is defined as as the length of the path traveled by light in a vacuum in 1/299792458 second....So yeah...as long as you have some light and a stop watch you can check that.
And...again the standard for pounds is a fractional number of Kilos. And a kilo is defined based on a prototype kilogram kept at the International Institute of Standards in France...so you'll need to borrow that bad-boy to do this right.
Here is an excellent video that discusses the same thing. Love it!
Phil
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guy48065
Well-known member
I have a Harbor Freight digital torque adapter that has been very accurate. I use this to check for any torque differences on my torque wrenches.
Now you are asking, how do you know that your HF digital torque adapter is accurate. I check it against my Precision Instruments dial torque wrenches and there is always less than 1% difference between the two. I also have verified it by hanging a carefully measured weight along a carefully measured breaker bar and used the formula to determine what the torque adapter should read. It is dead on.
The HF digital torque adapter says it has a torque range of 29.5-147.6 ft/lbs but mine reads dead on down to 5 ft/lbs as compared to my Precision Insturments 0-25 ft/lbs dial torque wrench.
I have tested 4 of these HF digital adapters so far, using certified calibrated weights and beam, and they are dead on.
texasprd
Well-known member
If you live in a fairly big city, there is probably a metrology (calibration) lab in your city. They can probably do it (for a fee, of course).
The only problem getting the calibration tested in a lab is the cost, if it costs $50-75 you'd kinda half way there to buying a new fairly decent torque wrench. Many folks of coarse buy cheap TW's from HF and the like for much less than a calibration test. It comes down to degree of accuracy needed for the user, but I find having a few TW's allows you to check from each other to feel confident accuracy is fairly good.
In another life I was tasked with this same sort of thing, where the question always became "Well how do you know the tester that you used to test the tester that you used to test the tester is accurate?" Maddening.
A foot is defined as .3048 Meters. The meter is defined as as the length of the path traveled by light in a vacuum in 1/299792458 second....So yeah...as long as you have some light and a stop watch you can check that.
And...again the standard for pounds is a fractional number of Kilos. And a kilo is defined based on a prototype kilogram kept at the International Institute of Standards in France...so you'll need to borrow that bad-boy to do this right.
Here is an excellent video that discusses the same thing. Love it!
Phil
Nice youtube clip!
dalehsc
ALLIANCE MEMBER
I check mine yearly at my local Coast Tire.They have a wall mounted unit that they have calibrated often. i know the manager & the price is right....free. I have a split beam 1/2dr Snap on,a 3/8 snap on torque angle & a Power Fist(Princess Auto) Micrometer 1/2 dr
Your well organised, that's the way to do it! Have your wrenches always remained within spec or have they needed adjustment. If so is calibration something your able to do yourself, what's it invoke? I have name brand Taiwan clickers that seem pretty decent for the little amount of use, kinda a pain they only click in one direction though.I check mine yearly at my local Coast Tire.They have a wall mounted unit that they have calibrated often. i know the manager & the price is right....free. I have a split beam 1/2dr Snap on,a 3/8 snap on torque angle & a Power Fist(Princess Auto) Micrometer 1/2 dr