Todays Torque Wrench test..

[03protege]

There is coupon and sometime sale for $9.99 on both 3/8 and 1/2.

The 1/4" also goes for $9.99 just not nearly as often.

 

[TwoInch]

Interesting read, especially the part where they don't set the torque wrench back to zero.

Torquing - Testing Torque Wrenches
http://www.fourwheeler.com/techarticles/129_1307_torquing_testing_torque_wrenches/

thats funny, same article as carcraft., slightly reworded and 4 months later

 

[Burgerkong]

thats funny, same article as carcraft., slightly reworded and 4 months later

You'll find that they're both owned by the same media company .

 

[Loscaldazar]

i would have to say that with the torque stick, you will still get the full reading on the torque wrench. IE, using a 70ftlb stick on a TW set to 100ftlbs, you would get 100ftlbs.

the best way i can explain it to people when they try to claim deep sockets or extensions change the applied torque, has always been handing them something long and flexible, like a ruler, yardstick, 1x4, etc... something that obviously twists, and have the twist it between their two hands. then ask them to explain to me how the stationary hand could be "receiving" less torque than the hand that is doing the twisting....

if the wrench clicks, or shows that 100ftlbs is applied, it is completely transferred, regardless of twisting or length from TW to fastener. changing angle will affect though, such as a u-joint, or wobble.

Extensions affect applied torque on impact wrenches, which is often misconstrued as extensions affect torque from a torque wrench. The sudden impact that an impact wrench creates, and the moment of inertia changes the applied torque (if I can remember my physics at all...). Steady even pressure takes all of that out of the equation, and keeping the extensions at exactly 90 degrees is the problem

 

[TwoInch]

You'll find that they're both owned by the same media company .

i figured that much.

 

[Kracin]

Extensions affect applied torque on impact wrenches, which is often misconstrued as extensions affect torque from a torque wrench. The sudden impact that an impact wrench creates, and the moment of inertia changes the applied torque (if I can remember my physics at all...). Steady even pressure takes all of that out of the equation, and keeping the extensions at exactly 90 degrees is the problem

i believe that has less to do with the actual extension being twisted and more to do with losing energy through more contact surfaces being turned, if you take a socket and extension and put it on an impact wrench and just twist the socket back and forth, youll find a little play between, and as the gun impacts, the whole thing will go back and forth on the drive, extension female, male, and socket ends, you will end up with better torque transfer if you hold the extension steady and twist in the direction you are going with your hand for a more solid impact without lost energy through extra movement being made between impacts.

 

[TwoInch]

Extensions affect applied torque on impact wrenches, which is often misconstrued as extensions affect torque from a torque wrench. The sudden impact that an impact wrench creates, and the moment of inertia changes the applied torque (if I can remember my physics at all...). Steady even pressure takes all of that out of the equation, and keeping the extensions at exactly 90 degrees is the problem

agree on all points. impacting(dynamic) torque is another animal all together. to use torque stick effectively, you must have an impact wrench that can be set to fall within a fairly small output torque window. i think usually around 400ftlbs. the torque stick twists(spring) and generates heat to diminish the short spike of torque applied. if your gun outs out 600ftlbs, the 100ftlb torque stick wont limit to 100ftlbs anymore.

 

[TwoInch]

i believe that has less to do with the actual extension being twisted and more to do with losing energy through more contact surfaces being turned, if you take a socket and extension and put it on an impact wrench and just twist the socket back and forth, youll find a little play between, and as the gun impacts, the whole thing will go back and forth on the drive, extension female, male, and socket ends, you will end up with better torque transfer if you hold the extension steady and twist in the direction you are going with your hand for a more solid impact without lost energy through extra movement being made between impacts.

wrong. its all about the extension twisting. there should be little to no play in the impact/extension/socket assembly. all extensions twist, period. that springiness is how torque sticks limit torque. a regular extension is no different, other than it not being "calibrated" or designed and tested to fall within a certain range of loss.

 

[TwoInch]

the same thing happens with a torque wrench. the difference is that since the input of the torque wrench(your arm) is not a fixed torque output like an impact. an impact will put out *** amount of torque, and no more, depending on how its set up. your arm will continue to apply more and more torque until the desired reading or click shows up on the torque wrench. torque wrench measures applied torque, not what you are putting into it. your arm will make up for the twist, but an impact cant because the short striking blow style of application.

 

[P_I_Torque]

i would have to say that with the torque stick, you will still get the full reading on the torque wrench. IE, using a 70ftlb stick on a TW set to 100ftlbs, you would get 100ftlbs.

the best way i can explain it to people when they try to claim deep sockets or extensions change the applied torque, has always been handing them something long and flexible, like a ruler, yardstick, 1x4, etc... something that obviously twists, and have the twist it between their two hands. then ask them to explain to me how the stationary hand could be "receiving" less torque than the hand that is doing the twisting....

if the wrench clicks, or shows that 100ftlbs is applied, it is completely transferred, regardless of twisting or length from TW to fastener. changing angle will affect though, such as a u-joint, or wobble.

Bravo!! You nailed it.

We have actually implemented this effect to reduce over-torque from users who like to "snap-torque". The added rotational forced required increases, which reduces the applied over-torque, after the click, since the end user is not applying torque at a controlled rate.

 

[Kracin]

wrong. its all about the extension twisting. there should be little to no play in the impact/extension/socket assembly. all extensions twist, period. that springiness is how torque sticks limit torque. a regular extension is no different, other than it not being "calibrated" or designed and tested to fall within a certain range of loss.

so how do i get more torque (far more) when just holding a 3/4" entension steady and up against the socket and bolt, as opposed to letting it impact on it's own, jolting back and forth?

you are right, there should be little to no play, but there is some, and the more pieces you adapt the more you get.

 

[TwoInch]

so how do i get more torque (far more) when just holding a 3/4" entension steady and up against the socket and bolt, as opposed to letting it impact on it's own, jolting back and forth?

you are right, there should be little to no play, but there is some, and the more pieces you adapt the more you get.

the difference should be nearly none. i imagine if you have a noticeable amount of slop, then there will be more noticeable loss. but i say if oyu have tha tmuch slop, its time to address why you have slop, and replace which ever component is giving it. wallowed out sockets and extensions, or abused broaching in a socket.

the fact remains that any and all extension will twist, and lose some transferred torque. material make up, size, length, temperature, etc.. all affect that number.