Torque Multiplier

[gus]

John,

Ash Flat is on Hwy 167 just south of MO. It is quite a bit east of Hwy 65, the route you would normally take from Branson to LR.

From here it is about the same distance to either LR or Branson on a dog leg route.

I will be here until Fri and back on Monday. Let me know your plans.

[JohnVickrey]

Gus, Sorry I have missed you.... we are in Mcghee south of Pine Bluff. 

Lin, My apologies for hi jacking your thread. 

John

[Lin]

I bought one and it came today.  It works wonderfully if you turn it in the right direction.  I forgot the lug I tried it on first was left handed.  Fortunately I realized the error before I stripped the stud.  I will use 8# on a torque wrench to tighten up.  It would be very easy to go to far with this.

[gus]

Lin,

These things are designed for loosening nuts but they are not very accurate for torquing.  It is real easy to over torque with them. If it is like mine you can easily reach 1000 lb-ft.

You might want to check some of your torquing with a torque wrench just to make sure.

[Lin]

Gus,

My torque wrench is really only good for up to 150 foot pounds.  I had thought that with a 60:1 rating, I could set the wrench to 8 ft/lbs and be within reason.  Do you think that this would not work?

[bevans6]

a torque wrench that is normally used to do up to 150 ft lbs is going to be horribly inaccurate at 8 ft lbs.  Each 1 lb error is going to be 60 ft lbs error after your multiplying by 60 times.  I would expect that your wrench, set for 8 ft lbs, will return somewhere between 5 and 10 and you'll never know which...   why not just use it to undo things, the way it's supposed to be used, and do the nuts up the old  fashioned way?  4 foot breaker bar and lean on it?

Brian

[zubzub]

a torque wrench that is normally used to do up to 150 ft lbs is going to be horribly inaccurate at 8 ft lbs.  Each 1 lb error is going to be 60 ft lbs error after your multiplying by 60 times.  I would expect that your wrench, set for 8 ft lbs, will return somewhere between 5 and 10 and you'll never know which...   why not just use it to undo things, the way it's supposed to be used, and do the nuts up the old  fashioned way?  4 foot breaker bar and lean on it?

Brian

This plus the fact that torque multipliers also have frictional loses (usually specified by the manufacturer) so you can add that to the mix and X it to your torque wrench's inaccuracies.

[gus]

Lin,

A 3/8 torque wrench in inch-lbs will be more accurate but I don't think that will help much as per the above posts.

You can use your 150 lb-ft torque wrench with an extension to bring it up to 450-500 by using a little math. All you're doing is extending the length of your wrench handle, kind of a cheater bar effect.