Torque Wrench Secrets toTest & Calibrate
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- เผยแพร่เมื่อ 16 มี.ค. 2019
- Torque Wrench Secrets toTest & Calibrate
Test, set and use your torque wrench properly. This important torque wrench equation can be used to calibrate any torque wrench. This method will work with just about any wrench, like a Tekton 1/2" click drive. There is a little math involved so have a calculator handy. IMPORTANT PRODUCT LINKS AND DETAILS BELOW:
TEKTON ½” Drive Torque Wrench: amzn.to/2O8eIUk
COOL ELECTRONIC TORQUE WRENCH: amzn.to/31FyEU0
GOPRO CAMERA: amzn.to/2W5WLIC
GRAPH PAPER: amzn.to/2TcYE4q
MERV GIFTS & T-Shirts: teespring.com/stores/mervs-merch
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DISCLAIMER: These videos show you how I do things. I'm not telling you to do these things. I cannot guarantee this information will be used correctly by the viewer, nor am I suggesting it should be. Before attempting similar procedures, conduct extensive research and decide for yourself what the best, safest methods are. Merv's Service Secrets accepts no liability for any personal injury or property damage incurred as a result of any of the information contained in this video. Merv's Service Secrets recommends safe practices and proper protection when working on projects requiring the use of tools and dangerous substances. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from the information contained in this video is the sole responsibility of the user. This video and all Merv's Service Secrets videos are for entertainment and informational purposes only. Always consult a professional or team of professionals for proper advice prior to attempting any do-it-yourself project, including repairs, recipes and installs that have been posted by Merv's Service Secrets and others. This video and description contains affiliate links, which means that if you click on one of the product links, we may receive a small commission, but that doesn't affect the price you pay. This helps support the channel and allows Demille to continue to make more videos like this. Thank you for the support!
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You're ignoring the weight of the torque wrench itself! A ½" wrench can easily weigh a couple of pounds. And, you can't just add in the weight of the wrench since that weight is distributed along the length of the wrench.
First, thank you for your comment and your disagreement. That's what this channel is all about. I am going to pin your comment, because I'm hoping others will chime in with their theories and that we can have a respectful debate regarding why I think the weight of the handle doesn't matter in this particular experiment.
See, in my opinion, we are trying to calibrate the torque ... or the "pounds of twist"exerted at the center of a circle based on the force applied to one end of a lever.
While you are certainly correct that gravity is pulling on the handle itself, I contend that the manufacturer has already factored that into their equation. But futhermore, let's think about a simple logical scenario that is actually quite similar: A teeter-totter.
Let's say the teeter-totter weighs 20 lbs and a 200 pound person jumps onto one side of it. The upthrust on the other side would be 200 pounds, right?
Now let's say a person weighing 120 lbs jumps onto one side of it. The upthrust on the other side would be 120 lbs right?
What if the teeter-totter weighs 80 lbs? The upthrust weight would still be 200 lbs and 120 lbs respectively.
So does it even matter how much the teeter-totter weighs?
Professional calibration is not done with the weight of the wrench factoring in. And a torque wrench is not like a tetter-totter that has weights on both sides of the pivot - the handle extends on only one side of the pivot.
Think about a situation where the lug nut is very loose, and you try the same calibration setup. The weight of the wrench itself will instantly cause it to drop before any weights are added, and the nut will tighten by ¼ turn. So we know the handle weight is applying some torque. Whether that matters or not in this calibration procedure is dependent on how much weight you're adding. A 2 foot long torque wrench weighing 2.5 lbs might create 2 ft-lbs of torque by itself (guessing here), so dividing that by the torque you thought you were measuring is your error. At 80 ft-lbs that would be only 2.5%, but at 30 ft-lbs that would be an almost 7% error before the error of the wrench itself is considered.
And even if you want to ignore that, setting the wrench after marking the position on the handle alters the distance of the mark from the head on most wrenches. And, one should choose a position in the middle of the handle, since that's how the wrench was designed to be used (geometry matters).
I understand your points, however, as I mentioned I contend that the manufacturer has already factored in the weight of the wrench handle (which, by your previous statement, you admit is incalculable -- because the exact distribution of the weight along the handle is not known.)
For example, let's say you set the dial to 35 foot pounds and the wrench handle exerts 2 foot pounds. Do you seriously think the manufacturer wants you to set the torque to 33 foot pounds in order to compensate for the handle weight? Of course not. Otherwise that would be in their instruction manual.
Instead, what the tool is designed to do is to transfer the energy you are exerting at the end of the handle to the center or pivot point as you say. My guess is the resistance of their spring is already part of their equation which compensates for the weight of the handle. This of course is supported by the fact that as a torque wrench gets older, it may require recalibration. (as the spring gets worn out.) As you know, when you are turning the dial you are adjusting a spring whose strength wanes over time. So the calibration process is really about translating the actual mechanical workings of the tool into a reliable physical representation that makes sense to humans -- a number. The question that gets answered in the calibration process is this: "When I set this dial to a certain number ..... and add the amount of force indicated by that number ... MINUS the weight of the tool as compensated for by its internal design ... am I putting the required amount of torque onto the object at the center pivot?
Aside from these nuances we are disagreeing about, I agree whole-heartedly that any variance at very low torque levels is going to be more of an error than say, 85 foot pounds vs 80 foot pounds. Now 20 foot pounds vs 15, yep that's an issue.
Do you believe a torque wrench gives different results when you're pushing down to tighten versus lifting up to tighten? Of course not - the user is simply either getting some additional help from wrench weight if pushing down or is overcoming the weight of the wrench when pulling up to tighten. Weight is not factored into the wrench's calibration. Testing can be done in a horizontal plane where weight doesn't contribute either way without different results.
In addition, you measured a mark on the handle before setting the torque wrench. On many torque wrenches, setting the value will change the distance of your mark from the head. And, since the geometry of many torque wrenches relies on the hand position for accuracy, it would be better to choose a spot in the middle of the handle instead of at the end.
For DIYers without access to an expensive torque measuring device (Snap-on has one for $680), I suggest getting a $40-$50 digital torque adapter. These use strain-gauge technology and are typically accurate to 1% or 2%. I'd be interested in seeing how well your weight procedure actually works when tested on one of these.
@@smorgasbord42 In your very first post, you stated the following and I quote: "You're ignoring the weight of the torque wrench itself! A ½" wrench can easily weigh a couple of pounds." Then, in. your most recent post you contradict yourself by saying "Weight is not factored into the wrench's calibration." You can't have it both ways friend. But we are all family here, so I'll take your word for it in your second comment and agree with you that the weight of the handle does't matter, especially where the manufacturer's internals of the wrench are calibrated to compensate for it. --Which is what I have contended all along.
Thank you so much Merv!
I bought a cheap torque wrench the same size as yours
I had a 35lb weight and tried it and it clicked at 47lb/64nm
So happy 😀
Wow!
Good video. I did similar with 3 cheapies, a 1/2", 3/8" and 1/4" drive, and they all were in the ballpark.
Very nice. Appreciate the comment, sir! You are a legend!
Hahaha awesome video why haven't I've seen it before? I love the nerd them
I found something wonderful in this channel.
And this channel finds something wonderful in YOU! Sure do hope you'll subscribe and turn on your notifications. -Merv Himself
I like this channel
What scale did you use to verify the weight of the dumbbell, and is it accurate?
Good question. I have a postage scale. It was nearly spot on.
you could also use a hanging weight scale instead of weights couldn't you
If it dont click, you adjust the tension screw clockwise? I used 20 lb weight and the torque i used was 26 ft lb. Even little push with my hand, it clicks didnt even have to put the weight on the handle. What to do if this happens?
I noticed with mine its a little trickier with lighter weights because it requires such a delicate touch. Its also possible your tension adjustment is screwed up.
Hello, you can apply this calibration to torque 3/4 spike 480 pounds foot at 3061
Wow!
The hat has spoken!
Como lo puedo ver en español o donde
Tenemos subtítulos en español. Sin embargo, no puedo garantizar que sean precisos. Haga clic en "CC" y vea si funciona. Espero que esto ayude. Mi español no es muy bueno. Y gracias por mirar! -Merv
God this was enlightening. But we dont have the same hobbies XD
OMG .. u did it on a prius? Geezus Merv .. :)
I never dreamed I'd be behind the wheel of one of those contraptions. I'm perdy sure it's powered by hamsters.
Shouldn't it be calibrated every time you use a number?
You could calibrate it for a series of numbers the day you get it. Lower numbers, mid range numbers and higher numbers. But if you use it and stored it properly, it shouldn't require frequent re-calibration each time.
@@MervsServiceSecrets thank you😊👍
@@MervsServiceSecrets I forgot to ask you that when calibrating at any one measure, is it accurate to use other metrics?
Who's Newton?
I'm pretty sure he invented the Fig Newton.