How to Calibrate a Torque Wrench - WikiVideo
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- čas přidán 26. 06. 2024
- How to Calibrate a Torque Wrench
Mechanics rely on torque wrenches to provide accurate and reliable torque readings so they can apply the right amount of force on the nuts and bolts in a vehicle. However, torque wrenches need to be calibrated regularly to make sure they're giving accurate readings. While it may be best to take your torque wrench to a professional for calibrations, you can do a pretty good job of keeping your torque wrench accurate by calibrating it at home.
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520 divided by 12 equals 43.33 ft lbs
RICHARD EVANS
I work it out at 43.33333333333333 ft lbs
I could not resist having an opinion on this. Due to the nature of how torque wrenches work, the end result of calibration creates a ratio in the scale. You change the ratio when you adjust any one location, then you only have that one spot where the torque wrench may be correct and it may be out at all other locations. To calibrate a torque wrench you need to check it at 20%, 60% and 100%. Some wrenches adjust the 100% using a screw on the side and others require change small metal blocks inside (pivot blocks).
You make adjustments as follows: Adjust the low end (20%) using the handle until it reads 20% of the max scale reading. Then adjust the screw on the side to set the 100% reading. If you had to adjust the 100% you then need to re-check the 20%. If you re-adjust the 20% you again check the 100%. You have to keep this up until you check both the 20% and the 100% without needing to adjust. Then you check the 60%. If the 60% is good you are ok, if the 60% is not good the only way to fix that is to replace the spring and start all over at 20% and 100%. It may have been left under tension for a long time and lost its spring tension ratio.
Other wrenches use a different system for the 100%. They use a pivot block instead of the screw and roller bearing inside. Everything is the same except you change pivot blocks with size differences measured in thousands of an inch. The 20% is still adjusted at the handle and the 60% is still the spring tension.
To adjust the wrench handle at any set value is to destroyed the Spring Tension Ratio and the wrench may only be accurate to that setting only. All other settings will be inaccurate. The minute you make any adjustment to the wrench you need to recheck 20%, 60% and 100% and ensure the Spring Tension Ratio is still accurate which it may not be. If you adjust the wrench at any one setting you totally change the ratio throughout the handle movement and very likely you have destroyed the accuracy of the wrench in all other locations of adjustment. By the way I have a certificate from Snap On to repair and calibrate torque wrenches as well as calibrate the instruments used to calibrate the wrenches. This will make the wrench unreliable at all locations other then the one it was set at. Take it from a certified torque wrench technician, do not do this.
Tim Maher
You talk even more bollocks than the video!
@@redblade8160 😀😄😉
Thank you for your guidance, I learned a lot from your comment. Any chance you can recommend some more reading material for calibration of tools?
@@princetchalla2441 The basic concept of calibration is simply comparing something to a known standard. If you have a scale you would like to check for accuracy and you have another scale you know to be accurate, simply check the 20, 60 and 100 percent of the unknown scale by comparing with the known scale. Take a weight that is around the 20 percent the maximum range of the scale and weigh it on both scales, if the scales agree at all three locations above, both scales are good. Easier if you simply ask a question with specific equipment in mind and I will do my best to steer you in the right direction. I googled "Calibration Basics" and found the following.
instrumentationtools.com/basics-of-calibration/
@@Soniccues I was interested in recalibrating some cheap torque wrenches I use for automotive work. At an aircraft shop I worked for, every time a calibrated tool was dropped or got dirty with sand and dirt we were required to turn it in to be recalibrated. There’s not many places I know of that calibrate or check cheap precision tools, and not that many that would do it for free. I was hoping to find out how to do it myself using the internet.
You don't need to do all that crap in order to calibrate a torque wrench!
The procedure shown is inaccurate since it doesn't factor in the weight of the wrench itself. And you can't easily compensate since that weight is distributed along the length of the handle. With a 2lbs wrench and 20lbs of weights, you could be off by a significant amount.
🤣🤣