Torque wrench

bexrbetter

Well-Known Member
#21
I have two Warren and Brown deflecting beam, 1/2 and 1/4 do need to check you get correct adapters for sockets youre using, it, they are expensive too.

W & B deflecting beam, the best torque wrenches of them all, moderate price.

Do deflecting beam require calibration as much as others?

All torque wrenches need to be checked depending on how often you use them. I checked mine every 3 months or so, but then again it was being used every day in the higher 10s.

I don't like the sudden release torque wrenches, they jar my wrist. Smooth ramp and beam for me  ....'click!'
 

kgwilson

Well-Known Member
#22
You can pay an enormous premium for a top quality torque wrench. If you are a mechanic assembling engines, transmissions etc on a daily basis you buy the best. Most home builders, back yard mechanics or average L1s use their torque wrench at standard regular maintenance intervals which is hardly at all. So long as those people purchase something that has a torque range capable of dealing with all of their requirements you do not have to spend very much. The cost of calibration is pretty much the same for a cheapie as it is for an expensive tool. Both of mine were quite cheap to buy and were surprisingly accurate when I had them calibrated. Even if the torque is out a little bit, at least the torque you set will be consistent on all the fasteners you are tightening. If you haven't used it for a while it pays to set it on the lowest setting and put a bolt in the vice and activate it a number of times. This will allow the lubricant inside the wrench to recoat the parts to ensure it operates consistently.
 
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M61A1

Well-Known Member
#24
I have two Warren and Browns as well jetjr, you can't get any better, top quality.
I have two of these as well.

Do deflecting beam require calibration as much as others?
I have found them to remain in cal much longer than any of the "click and cam" types. I usually test them on the Norbar tester we have at work. Over the years I have used various types like strap-on, Norbar and Stahlwille, and when it comes to consistent accuracy, I reckon Warren and Brown 'deflection' torque wrenches are the most reliable.

I also have a cheap Chinese one I bought in 1985, when I put it on the tester, it is consistent, but the numbers on the wrench are nowhere near reality, so I have a piece of tape with "actual torque" figures stuck on it.
 

planedriver

Well-Known Member
#25
Sill for sale Nev, “Deflecting Beam Torque Wrench”

not cheap but I like the simplicity and reliability of them. - no compressed spring to loose tension over time[/QUOTE]

As torque wrenches generally get infrequent use, it's always been a practice of mine to back off the adjustment to zero when iv'e finished using it.
This will ease the chance of the spring getting tired over time, thereby throwing out it's accuracy.
 

onetrack

Well-Known Member
#26
I have 2 Warren and Browns and 1 Norbar. Probably what most owners are missing is the informative W&B instruction sheet, which is near-on impossible to find today.

Remember that clean threads are a must when torquing fasteners (I run a bottoming tap through all threads that aren't new) - and whether you use thread lubrication or not is critical.
Lubricated threads will make a difference of 10% or more to actual torque applied to the fastener shank. Some manufacturers will specify whether threads should be dry or lubricated, many don't.
Usually fasteners are installed dry, but occasionally you will be desiring to add anti-seize to threads where corrosion potential, or the likelihood of galling, is very high.

Adding anti-seize to fastener threads effectively makes them a lubricated fastener, and the recommended dry thread torque setting should be reduced by 10%, when threads are lubricated.
The same principle applies to threadlocking compounds, they also lubricate the threads.

Trying to get 100% repetitive accuracy in torquing fasteners with simple torque recommendations, is very difficult.
Thus the reasoning behind the introduction of the "torque-angle" method, where a low torque setting is used initially to "bed" the fastener, followed by an additional set amount of turn, measured in degrees.

Torque and angle explained
 
#27
?????? the recommended dry thread torque setting should be reduced by 10%, when threads are lubricated ??? I thought that a lubricated bolt would require higher torque, but I was wrong.

When a bolt is lubricated - less torque is required to achieve bolt axial load or tension. Reduction of torques for lubricated vs. dry bolts are indicated in the table below.
Lubricant Torque Reduction
Lubricant
Torque Reduction (%)
No lube 0
Graphite 50 - 55
White Grease 35 - 45
SAE 30 oil 35 - 45
SAE 40 oil 30 - 4


The maximum tightening torque for a slightly lubricated 1" Grade 5 coarse bolt is 483 lb ft. Dry bolt torque is approximately 30% higher - or 628 lb ft.
Tdry = (483 lb ft) (1 + (30%) / (100%))
= 628 lb ft

If the bolt is lubricated with SAE 30 oil - the torque compared to a dry bolt is reduced with approximately 40%.
TSAE30 = (628 lb ft) (1 - (40%) / (100%))
= 377 lb ft

Note that if torque specified for a dry or slightly oiled bolt torque is applied to a lubricated bolt - the bolt may overload and break.
 

facthunter

First Class Member
First Class Member
#28
All this is good gen.. Finer threads need less torque also . That you are trying to do is apply an axial force which the design needs to locate the parts firmly . In large applications the load can be applied by hydraulic means and the nut just located against the face to position it and the hydraulic pressure released. Where you are pulling a taper in, the nut may distort the outer part of the tapered hole and alter the fit by burring the end of the tapered bore. There's a lot to be said for tightening it to a low torque initially and then going through a stipulated number of degrees to get the figure you need.. Nev
 

Jaba-who

Well-Known Member
#29
Find out who you are going to use to calibrate it and ask them what ones they’d recommend.

We have a guy in cairns who actually refuses to calibrate kinchromes.

Says they are frequently go out of calibration as soon as they first get used after a calibration.
 

M61A1

Well-Known Member
#31
Says they are frequently go out of calibration as soon as they first get used after a calibration.
That's what I'd say about Norbar wrenches. We had heap of them on a toolboard at one place, they were rarely in cal when put on the tester (we were required to test them prior to every use). The Norbar guy used to whinge that they weren't being returned to zero after use, but I know that to be false. He also said that we should exercise the mechanism several times before use, while it made a difference, most of the time they still weren't in cal limits.
 
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