CALIBRATE YOUR TORQUE WRENCH IN UNDER 5 MINUTES (NO SPECIAL TOOLS REQUIRED!)
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- Опубликовано: 4 июн 2024
- Easy, DIY tutorial how to accurately calibrate your torque wrench at home without any special tools. It takes just a few minutes and It’s quick, easy and rewarding knowing that it’s accurate every time!
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00:00 What you need to calibrate your torque wrench
00:27 Equation for torque wrench calibration
01:20 Calibration setup
03:05 Adjusting torque wrench calibration
#torquewrench #mechanictools #toolboxtour #calibration - Авто/Мото
If this video helped you, please consider clicking on the THANKS button above to support my channel 🙌 PLEASE NOTE: there is an editing mistake in this video - ALWAYS set the specified torque by twisting the handle BEFORE measuring the length from the head. Otherwise your measurement will be wrong :) thanks!
The like button will have to do.
Thank you 😊
@@ClaudeSac Tbh hitting the thanks button wouldn't have occurred to me if he hadn't mentioned it - and I feel indebted for this invaluable and money-saving advice so it meant I could show my appreciation in some small way! With 5.7k likes, a small percentage of donations would really add up and encourage more advice like this. A few quid is a lot less than paying someone for the info, or recalibrating or replacing a tool!
Thank you! I appreciate the donation very much! Glad you enjoyed the video!!
Sir, your a genius and I can't thank you enough ❤❤❤❤
Nice tip, I will be re-calibrating both of my wrenches.
One tip I was given more years ago than I care to admit was to turn your torque wrench back to zero after use, relieving the tension on the spring.
Cheers, Geoff
Spot on Geoff! Always take the tension off :) thanks for watching and sharing 👍
At work, we had our torque wrenches calibrated yearly. As an experiment, I bought a really cheap one and left it wound right up for three years, it passed calibration.
@@paulhawkins6415 interesting! Thanks for sharing!
@@paulhawkins6415 "experts" say "don't keep your magazines loaded with ammo, as it will weaken the spring". Yet militaries around the world store full loaded magazines for who knows how long.
My magazine spring began to misfeed my H&K USP .45 in less than a year of being my always loaded bedside gun. Changed the spring, problem gone. @@savage22bolt32
tip, if you can go 12 inches on ft. lbs, you can set the wrench to the same as the weight you are hanging.. no math involved :)
Explain this a little further, not quite following, thanks
@rtg8point858 for the imperial the math is the weight ÷12 × the distance along the torque wrench.. if you go with 12 inches, the ÷ 12 × 12 nullifies itself, so the result is whatever weight you choose, that's what you set your torque wrench to.. no math involved at that point. Hope that explained it for you 😁👍🏻
@@JaneRoseDrummer Ok. That's what I thought you were saying, just wanted to be sure. Thanks
Yeah that's what a foot pound is, 1 pound at 1 foot
Good tip! You could also extend the handle with a pipe, or make your own tool to hang those weights at specific distances every time you do this. Ie. a two foot pipe with notches for the string at 12 and 18 inches, choose your weights according to the specs on the wrench. Super simple calibration every time. You also don´t need so much weight if you extend the leverage, so that might be a thing too.
A good post and usefull vid .👍
Most cheap high street wrenches are way off and need calibrating.
I Used to calibrate equipment as a tech support engineer both eletrical from fluke meters to torque wrenches Ultra light 6ft lbs too 500ft lb long bar.
Good advice for a rough home setting.
I'll just add to get it spot on you ideally need to check the lowest, the mid & the highest settings as the spring tension accuracy can vary hugely and may show that the tool is no longer accurate on all settings.
Most common reason is because people dont reset the wrench back to its lowest setting after use and just leave it for months with the internal spring under constant load.
Thanks for sharing your experience, great stuff :) yes, checking the full range is certainly worth doing!
nice easy instructions .. 79 years old mechanic learning every day .
Every days a school day :) thanks for watching!
this is gold ! perfectly shown an explained on NM and FT-LB in a simple way..... no useless blablabla simple perfect !
Thank you! I really appreciate it :)
You should measure the distance from the drive (where you hang your rope) AFTER you set the wrench to the appropriate weight because the handle moves in slightly toward the drive as you turn it. Also, make sure the wrench is perfectly level. Good tips, though. Thanks for sharing
Yep, thanks for watching. 👍
I could not believe nobody mentioned this, until I found your comment 😂👍🏼
These clicker type wrenches are typically calibrated for the force applied exactly at the middle of the grip (and it does matter, there are a few videos explaining and clearly demonstrating this), therefore that should be the point you hang your weights from and measure the distance to. Ideally, one should test different hanging positions on the handle with different weights at both ends of the wrench's torque range, find the position that gives the most accurate results throughout the torque range and then only apply force at that exact position during normal use. Whether it's going to be the middle of the handle or closer to either end of it really depends on each specific wrench model.
Yep! I have learnt something new here! Thanks for sharing :)
Also you need to take wrench handle weight into account. So actually it is way easier to calibrate it with torque meter.
Minimum spec on my Torque Wrench was 20 FT Pounds. I didn't do much math and still calibrated it. I though to myself "Foot, pound" Therefor 1 Foot away from the head should required 20pounds of load is what is needed to click it at the 20Foot Pound setting. So i filled up a bucket with 20 pounds worth of water and i was able to perfectly calibrate it. *I was able to verify this theorie with a new one and it clicked right when i was laying down the handle of the bucket on it.
Sweet as, good work :)
This is the best video ive stumbled upon all year thanks!
Awesome! You’re very welcome :)
Thanks for this, I have been wanting to calibrate my 1/2 inch torque wrench for years, but never thought about a method like this.
Awesome! It’s really simple :) glad you enjoyed it!
Very cool, Tom! I knew a specific torque was dependant on weight and distance, so your procedure is brilliant. Those two figures and the conversions are all that's needed. Way to go!
Thank you! I’m glad you enjoyed the video and found it helpful!
What a great demonstration! I had no idea that you could do this, but it make perfect sense!
Glad you enjoyed it!
Fantastic ,simple, straight forward . Thanks
You’re welcome :)
always back off torque wrench when finished using relieving spring pressure
Spot on, couldn’t agree more!
Agree...
Wrong, leave a small amount of pressure, 5 ft lbs, so the spring isn't collapsed on itself.
I see leave 5 and zero...ok, lock it or keep unlocked
@@jeremywallace5961how does a spring collapse in on itself?
This is the best DIY demo I've found. The process is not that complicated, although for accuracy the right angle distance and mass need to be accurate. I've often wondered how much ambient temperature affects this clicker style of wrench. In the end, most of the time a variance of 5% is fine. Often it is a comparative tool, so even if it is out a little, all the bolts will have the same torque. These days we tend to go overboard with torque, although the margin for error in aluminum housings can be small.
Thanks for watching :) I agree, for what we all do 5% even 10% is not a problem. Heck you could be even further out and not have any issues. If it was on a a spaceship then it’s a different ball game. This gets you very close, easy to do at home and will be far more accurate than doing it by hand :) thanks for watching!
I agree that this is a clever way for diy calibration. Although not complete. Even though the style of torque wrench you show here is common, there are a lot of different ones. And the method of adjustment also differs. Some do have the screw you show now, but also a lock screw for instance. A lot of professional wrenches also feature an adjustable scale.
Typically you adjust the screw you show in the video to set max torque, and adjust the scale for minium torque. Most cheaper wrenches have a fixed scale and I would recommend calibrating for the range you use, as it will be hard to get it right all along the scale.
Most professional torque wrenches are supposed to be within a 3% margin along the full scale. Typical calibration is done at 0% 60% and 100% force. It will be hard to get it to within this spec with this diy solution. But it's definitely better than not checking it at all. The 3% margin is also ludicrous if you ask me, how you hold the wrench, how you apply force, is your bolt dry or lubed, etc will have more effect on the end result the a bit bigger margin on your wrench.
Bear in mind that the electronic force gauges might also not be accurate. Especially cheap models can have quite some deviation. So you might want to check the force gauge with this method before using it to calibrate.
In short, good method for approximate calibration with little expense. But not suitable for critical work.
Just my 2 cents as someone in the tool business, including calibrations.
The wrench handle should be horizontal; maybe it's the camera angle that makes it look like it's pointed down, which would make it require a higher torque to click off.
Thanks for sharing, easy to follow and worked.
Thank you :)
What an easy explanation. Thank you so much.
You’re very welcome!
Awesome explanation!
One of the best I've came across! 👏
About the point where to hang the weight, actually that bit without knurling is there to be the exact center of the handle 😉
Awesome! Glad you enjoyed it :) thanks for sharing too 👍
Great video. I'm going to try this out myself. One note: I think it is important for the torque wrench handle to be parallel to the ground. If it isn't parallel (or as nearly so as possible) then the effective length is different from the measured length thanks to vector trigonometry.
Yes sir you’re spot on! I think it’s important to be as accurate as we can, but also remember that even if things aren’t precision perfect - it will still be more than good enough for what we do :) you won’t snap bolts being a bit over nor will it cause an engine to fail being a bit under the specified torque. Thanks for sharing!
@@VintageEngineRepairs Just as a follow up, if you're within 10˚ of horizontal you'll be within 2% of accuracy, which is equivalent to +/- 4mm on your length measurement. Given your string is about 4mm in diameter, that's plenty of precision.
If you get out to 20˚ you're still within 7% of the calculated value, but it starts to rapidly fall off in accuracy after that.
😯
whoooeeew
math does hit hard 😭
@@daveatutubeAs the purpose is to calibrate the torque wrench, you want to do what you can to achieve max accuracy, and that does not involve having the handle at an angle.
@@VintageEngineRepairs You did not mention it, but did you weigh the rope with the weights? For that 1 or 2 % accuracy, the rope may make a difference. Not moaning, just checking/mentioning. Also, could we all say pound-foot, like Newton-meter? That's moaning ;)
Brilliant! Exactly what I was looking for. Thank you.
You’re welcome :)
Thank you 😊
You are very clear and easy to follow.
Very much appreciated 👍
Ted.
You’re welcome! :)
I used this method and my very old wrench was off by only a few pounds (maybe 5). I made the adjustment, and the whole process was very easy. Thanks.
Super pleased you put it into practise and had the expected success :) well done!
Clear and concise Tom, thank you mate
You’re very welcome mate, thanks for watching! :)
Super good video, I am going to do this to my torque. Wrenches, thank you very much.
Absolutely! You’ll get them spot on in no time :)
One thing not accounted for with this method is the weight of the handle, which is small but not zero. In the big picture it's likely negligible. I suppose one could measure this with a simple experiment. Suspend the wrench with a string looped around the center of the head, then support the handle end with a scale. Multiply the measured scale weight by the right angle distance from scale contact point to string, and you've got baseline torque with no extra weight added.
Yeah I agree with you, it’s negligible, as mentioned before, for what we do, it’s not going to make a difference. Most torque wrenches come with, from memory, +/- 10% accuracy. Thanks for watching and commenting, it’s always good to hear other people’s opinions and ideas :)
To eliminate the weight effect, you could turn the torque wrench sideways and apply a known force from a fish scale.
Ah, but then you'd have to add or subtract the weight of the handle depending on whether you're pushing it up or pulling it down when you're actually using it. If the bolt is vertical and the handle is rotating horizontally then no correction would be needed.
Put the wrench in the vise horizontally and run the cord over a pulley or some other low friction device to turn its path from horizontal to vertical
@@michaelallen5505that's not true, you would be applying however much force is needed to reach the torque spec regardless
Brilliant. I’ve got three torque wrenches I’ve had for years. Always take care of my tools but wondered if they had started to lie to me over time. Never even knew about the calibration bolt. Perhaps I should RTFM! Thanks & subscribed.
Glad you enjoyed the video! Hope it helps calibrate yours :)
Great vid. Very well done and practical information!
Thank you!
I found that the non-knurled ring is exactly the calibration point on three various wrenches. Checked by a weighed bucked of sand at home, then on a NIST-traceable calibrator at work.
Thank you for sharing!! Much appreciated :)
I've always assumed that was what the ring was for - It's around the centre of effort when holding the handle. - Nice to have it confirmed.👍
when you turn the setting handle, you're shortening the length of the torque wrench - you need to compensate for that when positioning your string because the initial measure is now off - should reposition the string at the original measurement of 11" which would require confirming with your measure tape (would shift slightly towards the end of the wrench a bit). small detail.
Spot on! Yes I got the edit backwards, but you’re right! Measure after setting the torque :) thanks for sharing!
@@VintageEngineRepairs no worries - thanks for making such a good video on a somewhat 'mystery' topic most home mechanics would benefit from watching
Thank you for the kind words and correction :)
Beautiful explanation. Thank you for that!
You’re very welcome!
How to calibrate a torque wrench..... and how to make a clear, well explained practical video. Great work.
Thank you :)
When I was taught to use a torque wrench many year ago. We were told that the break in the knurling or the thin band of knurling was where your middle finger was supposed to be placed. The reason given was that this represented the calibrated distance from the drive head to achieve the most accurate torque. After watching your video, that make sense and would cause me to use the as a reference when calibrating. Either way, I really liked the video and thanks for the cool trick to add to my knowledge.
Thanks for sharing and the kind words h
I don't think it matters where you hold it, the wrench still has the same accuracy just the force you need to apply will differ slightly but it will still click at the same nut torque force
@@stargazer7644 I use my digital torque wrench as a torque meter to test my other torque wrenches.
@@stargazer7644 It does matter where you hold and calibrate the torque wrench. You are meant to apply the force at the groove that all of these torque wrenches have. They all have them for a reason. I know that may be unexpected because a torque is a torque after all, but these click-style torque wrenches complicate things somewhat.
There are actually two torques in play here: one torque at the head of the torque wrench which is wrenching on some fastener, which is what we want to measure, and another torque at the "elbow" between the head and the handle. The torque wrench actually measure the torque at the elbow, which is where the clicker is, and we use that to stand in for the torque at the head. That works fine if we calibrate things right to give us the right numbers.
However, the calibration assumes a particular ratio between the handle length and head length.
To gain an intuition for this, imagine a particular torque wrench that has a particular torque dialed in. In your imagination, apply a torque at the groove and make the wrench click. Now, leaving everything else exactly the same, modify the wrench to lengthen the head and shorten the handle, but let's leave the total length the same as before. Let's say the handle is now half as long as it was, which means that the elbow will now be approximately half way along the wrench. Now, apply the same torque as before. Will it click? No, it won't because the lever arm to the elbow is half as long as it was before. You will have to apply twice the force to make it click now.
That shows that the ratio between the two lengths does matter. Going back to the original torque wrench now, if you apply the force at a different place, you will be changing the ratio.
@@stargazer7644 The force from your hand should be applied at the same point that the calibration force was applied. You might as well use the groove that is put there for that purpose in every single click-style torque wrench.
I know what you are saying. A torque is a torque. But that doesn't apply to click-style torque wrenches, as I explained above, because the "elbow" point, where the clicker is, is not at the same place as the "socket" point.
The actual measurement point (the "elbow") is not exactly at the same place as the intended torque application point (the "socket").
For other styles of torque wrench such as a digital one or a deflecting beam one, then yes, it wouldn't matter where you hold it because the measurement point (the transducer in the digital one for instance) is at exactly the same place as the socket.
Great video and so simple to do. I have been told by multiple tool shops that the smooth ring in the handle is the factory point where they test the torque wrench. Not sure if it is true but you might as well use it as a fixed point for future calibrations so you get the same point each time. You'll also notice that the ring is slightly closer the end of the grip, this is because when we pull on a handle at 90 degrees more of the force is concentrated towards the last 3 fingers (middle, ring and pinky) on our hand. This enables us to grip something very tightly while still being able to use our thumb and fore finger for other things. Try it out.
Thanks for sharing, much appreciated :) I’ll give it a go!
Yes, I noticed on your last click test by hand you probably without thinking positioned your hand right over where that band is on the handle. Cheers, great video
@@nigelthompson874 well spotted :)
Yes, typically the handle is marked for this purpose. Not just for factory calibration, but also for recalibration. Different brands use different marks, but I would expect the clear ring to be the mark in this case.
Excellent instruction. Thank you!
You’re welcome! :)
Thank you for this valuable information!
You’re very welcome!
Great video for the home DIYer. It is also important to remember that these torque wrenches are more applicable when you're working with multiple bolts that all need to be torqued the same. I.e. car wheel lugs, or a pump head flange, etc. For a single bolt, especially in a sensitive application, these torque wrenches only bring you within a ballpark spec and probably not the best tool to use. But this calibration method is simple, quick and yields acceptable results, so thanks very much for sharing.
Thanks for watching and sharing, it’s a great method to set and keep your torque wrenches accurate for what we use them for. It’s not perfect with the small variables, but it’s more than accurate enough and offers anyone the ability to maintain theirs without any money spent.
I prefer using a small luggage or fish scale, cheap to buy and accurate enough for this. Then just keep it at the measured distance on the wrench handle while pulling handle at 90 degree until it clicks...read max "weight" on the display. Adjust wrench calibration accordingly. This keeps the force at 90 degree to handle, no contribution from handle's own weight (as in this example with handle adding small amount to turning downward force applied). And no need for any calculations nor pre-weighed dead weights.
That’s a great idea if you have the scale, yes! I don’t have that but it would be handy! Thanks for sharing :)
That information is very helpful. Thanks and take care
Thanks Steve!
Great Vid Tom, I would just add at 0:45 that the 9.81 is Newtons/Kg so that the units would cancel out and leave you with Newton Meters. Good Stuff!
Thanks Kenny! Much appreciated mate 👍👍
Kudos Tom. Liked & Subscribed: Clearly explained and demonstrated. From 'across the pond' John 14:6
Thanks Rodger mate :) much appreciated! I’m glad you enjoyed it!
Really appreciate this content. Thanks very much!
You’re very welcome! Thank you :)
Excellent. Thanks for sharing. 👍
You’re very welcome :)
After you set the torque, you've moved the spot you measured to, so dont you have to re measure from the socket drive because the spot on the handle you choose is now half inch or so up the bar??????
Hey, yeah that’s right, I did as you said, but the video was made up of multiple segments and it should have been put in first. Set the handle adjustment, measure and then hang. Thanks for watching and commenting!
@@VintageEngineRepairsThis info should be pinned comment!😉
Brilliant thank you
Exactly what I was questioning!
If I were doing this, I’d just choose one of those grooves in your handle and then always use that. Find a way to measure the “proof weight” and the length as accurately as you can. Still, at the end of the day, the mechanism is only so accurate. You may get it perfectly calibrated, but then repeat the same torque application ten times and still get 1-2% difference in applied torque. Also, it’ll probably be different along the range of torques. It’d be interesting to get a digital torque gauge and then measure a bunch of settings to see how the variation looked along the range. Also, if you use the setup like in the video, you’d need to account for the weight of the torque wrench in addition to the proof mass. 😜
I see 2 major flaws in your method, 1st: when you twist the handle to adjust the torque setting, the spot you've chosen to hang the weight has moved, now closer to the drive than you've measured before. To mitigate this, choose a torque and adjust wrench beforehand then calculate and measure where to hang the weights along the handle. 2nd: when it clicks, the torque wrench isn't perfectly parallel to the ground, it has sagged, hence the force of the weights acting on it isn't perfectly perpendicular. To mitigate this, let the wrench rest higher so when you put on the weights, it will click at approximately parallel to the ground.
Yep spot on, it was an editing error, I left a pinned comment covering this! I now do this horizontally with luggage scales :)
Should I factor in the weight of the torque wrench too?
Not sure how I got this recomended but you are a legend mate, one of the simplest and well explained videos I've seen on the matter
Thank you!
SUPER helpful. Thank you
You’re welcome!
Why not hang the weight on it and then turn the screw until it clicks. Then you know you're dead nuts the first time.
You put a lot of tension on the spring loading and twisting, but I do like that idea! Just not sure it’s going to be quicker.
Fifth are we being silly 🥹
🤣
Thanks. We just looked at the calibration tag on all our torque wrenches.
I worked in Maint. for a BIG airline.
But I use them on my vehicles too.
Great video.
Ah awesome! Thanks for sharing :)
Excellent video, thanks for sharing. Cheers
You’re very welcome 👍
I have a couple of torque wrenches that I've had for years and never had them calibrated, good to know it's an easy process to do myself. Thanks!
You’re welcome :)
Thank you i had no clue how to do this procedure!
You’re welcome! It’s my pleasure 👍
Didn't realize these were so easily adjustable. Good to know, thanks!
You’re welcome! :)
Very informative! Thanks. 👍
You’re welcome!!
Simple when you know how! Excellent vid.
Glad you enjoyed it!
Very helpful and easy. Thank You 👍
You’re welcome :)
Fantastic video! Thank you very much.
You’re welcome!
This is very helpful. thank you.
You’re welcome!
I literally cannot “like” this instructional enough….this…this right here, is what I needed to see! Thanks man! You are a savior of my OCD…..
Haha that’s awesome, glad you enjoyed it!
Excellent! simply explained and clear verbal info! i have a New,out of the box 1/4 inch torque wrench that i need to check for accuracy to be sure, I will now also check my 3/8 and my 1/2 inch ones to reassure !! ty so much!!
Awesome! You’re very welcome :)
Fantastic video. Rushing home after work to do this
Haha cool :) you in Australia?
Great video! Thanks
You’re welcome :) thanks for watching!
Great video straight to the point
Thanks mate, glad you enjoyed it
Thank you. I'm just a home mechanic/tinkerer so have never had my torque wrenches calibrated. Now I can do it myself! Thank you!
You’re very welcome :)
Nice video and well presented. Thanks
Thank you! You’re very welcome :)
Great video Tom with excellent information
Thanks Nev!
Thankyou for sharing this. Good stuff on your channel
Thank you! :) glad you enjoy my content!
Really useful👌🏻
Thank you for sharing 😊
You’re very welcome!!
Thank you. Great information.
You’re welcome!
Thank you Sir, we learned something new today
My pleasure :)
Checked all my torque wrenches with this procedure and was astonished how close high (priced) quality wrenches and cheap ones were. Many thanks for this excellent explanation....
Glad you enjoyed it and found it helpful!
Thanks for posting!
You’re welcome! Thanks for watching :)
Thanks thisbis great. I ended up with a snap on torque wrench from a guy who gave me a mixed bag of tools. Mostly cheap stuff but boy was i shocked when i pulled out a snap on torque wrench. Been wanting to check it out.
That’s awesome, great score!!
This is awesome!! I never thought of looking for this process and always though that because I’m a diyer I’ll just assume that my torque wrenches will be within the tolerance. Thanks for this nice visual explanation!
Awesome! Glad you enjoyed it :)
Useful video👍👍👍 Thank you🙏😊
You’re welcome :)
Did this years ago. Can also use a wrench clamped to something like a work bench instead of a vice or horizontal bolt.
Absolutely :) thanks for watching!
Great video! Thank you!
You’re welcome!
Great video, much appreciated.
You’re welcome :)
Thanks Brother. I have been using 2 wrenches together and " Clicking" from there. This is way more accurate.
THANKS Tom
Awesome mate ;) glad it helped!
Thanks straight to the point
You’re welcome!
Thank you for your knowledge and videos USA 🇺🇸 USA 🇺🇸
You’re very welcome!!
Great information, thank you
You’re welcome!
Very clever! Thanks.
You’re welcome!
Nice video, thanks for posting it.
You’re welcome, I’m glad you enjoyed it!
Brilliant thank you for the post😊
You’re welcome :)
awesome!! Thank you for the education! love it :)
You’re welcome! :)
I'll need to check my older torque wrenched, thank you.
Awesome :)
Very useful information. Thanks a lot!!!
You’re welcome!
Nice Work ...!! Thank You for sharing .. Cheers :)
Thanks for watching :)
Excellent! Thanks.
You're welcome!
Great information and video 👍
Thanks for watching :)
Thanks for sharing this. 👍 😊
You’re welcome! :)
Brilliant! Thank you!
You’re welcome!
Woow, thanks! I didnt knew that it was this easy.
I have a nice quality torque wrench stuffed away due to huge inaccuracy (25-28%)
I Will now try and calibrate it! 😃😍
Awesome! Glad you enjoyed it!
Excellent video!
Thank you!
What a brilliant video.
Thank you!
Just thought of my first torque wrench, it had a pointer and a scale on it, the pointer was a thin rod in parallel to the main wrench bar; the challenge was to try and read where the pointer was while exerting steady pressure on the wrench!
Geoff
Ah yes, a beam type torque wrench?
Well impressed. Easy to understand with no waffle. Subbed.😎
Thank you! Much appreciated :)
thanks mate, time to calibrate the torque wrench👍
Awesome! Enjoy :)
Nice, thanks.
You’re welcome!