anybody got a torque wrench?

I have one, but need to borrow one to check calibration, coz I rarely use mine.

 

I have! But I'm not coming all the way down there two days on the trot
Bad timing there Alan!

 

http://www.acs-calibration.co.uk/Ca...?branchID=130&Calibration_Services_EASTBOURNE

 

Come on Rob, can you imagine me going there, unless it,s free?

 

yes matey i have one.. couldnt tell you if its 100% accurate, its about a 2 years old now ....but your welcome to it borrow it

 

Me too Alan, I could bring it to Blue boys next week if that helps

 

Yeah, my bum still hurts from the last visit to his.

 

You ain,t my type les. Yes Paul and Dean , can we have a torque wrench session at BB?

 

Err...from the KTM seat.

 

Use the math, Alan.

Measure from the centre of the pin that the socket goes onto down the wrench and mark a point at a known distance. Then take a known weight (say 20lb) multiply that by the distance (ex 15") and divide by 12 (inch lb to ft lb) - set that weight into your torque wrench and then clamp the pin in a vice with the wrench horizontal and hang the known weight from it at the known distance.

T (Torque wrench setting in ft/lb) = L (Length in between pin and point on wrench) X W (known weight in lb) / 12

the slightest touch beyond this weight should reward you with the 'click' if it doesn't move the weight up / down the wrench until it does, measure that distance and again multiply by the weight and divide by 12 to get the actual amount. The difference between the 2 is the inaccuracy of the wrench.

You can adjust the distance measurement to allow the torque setting to fall within the range of your wrench for the given weight.

Did mine today like this.

 

Thanks Dave, I'll give it a try. I haven't used my torque wrench since I did an engine build about 10 years ago , so the internals could be a bit rusty. Be nice to compare one with another.

 

I guess the next question though is what torque range do u need ?

 

Understandable, but they requires the other wrench is known accurate itself. This way doesn't allow for deviation as if you get the math right, it's an exact formula.

 

I'll give it a go. Think I need 0 to 50 ft/lbs for the GSX engine. Not too worried about exact readings, just want repeatability , so that I put the same torque on all 12 studs.

 

28lb @ 15" would give you a test torque of 35ft/lb, as example.

 

Got any more examples Dave, say from 0 to 50 ft/lbs in 5 ft/lb increments?

 

You lazy sod! I gave you the formula.

You should only need to check 1 figure to ascertain it's accuracy, but if you wanted to test it on several settings you'll need a few 'known weights' for example.

4lb weight X 15" distance = 5ftlb
8lb weight X 15" distance = 10ftlb
12lb weight X 15" distance = 15ftlb

You get the idea.

L X W / 12 = ftlb setting.

 

Thanks Dave , I'll give it a go . Still wanna borrow Dean and Paul's though!