If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Torque Wrench Calibration
I was getting ready to install a replacement manifold on the old Mercury
and it occurred to me I ought to be pretty sure my torque wrench didn't strip the aluminum threads. The Snap On dial wrench hasn't been recalibrated for 30 years and the Craftsman torsion bar wrench is too clumsy to get to some of the bolts. I was kicking it around and I came up with using the torsion bar wrench on a bicycle axle nut and then putting the dial wrench on it to see if the reading matched. It did. Then, I went ahead and checked the Craftsman clicker wrench of the same vintage and recalibrating, and it came up with a match also. Then I did the torquing with the dial wrench and cross checked it with the torsion bar wrench, with all good readings. So, I'm just going to call them calibrated. Andy Phoenix |
#2
|
|||
|
|||
Torque Wrench Calibration
|
#3
|
|||
|
|||
Torque Wrench Calibration
Make it so that you can pull the torsion bar wrench with the snap on--
against each other. They should read the same. How could the torsion wrench be off if it zeros properly and nothing in the ponter binds? Bill Hale Loveland CO On Jun 25, 12:39*pm, wrote: I was getting ready to install a replacement manifold on the old Mercury and it occurred to me I ought to be pretty sure my torque wrench didn't strip the aluminum threads. *The Snap On dial wrench hasn't been recalibrated for 30 years and the Craftsman torsion bar wrench is too clumsy to get to some of the bolts. *I was kicking it around and I came up with using the torsion bar wrench on a bicycle axle nut and then putting the dial wrench on it to see if the reading matched. *It did. Then, I went ahead and checked the Craftsman clicker wrench of the same vintage and recalibrating, and it came up with a match also. *Then I did the torquing with the dial wrench and cross checked it with the torsion bar wrench, with all good readings. *So, I'm just going to call them calibrated. Andy Phoenix |
#4
|
|||
|
|||
Torque Wrench Calibration
wrote in message ... I was getting ready to install a replacement manifold on the old Mercury and it occurred to me I ought to be pretty sure my torque wrench didn't strip the aluminum threads. The Snap On dial wrench hasn't been recalibrated for 30 years and the Craftsman torsion bar wrench is too clumsy to get to some of the bolts. I was kicking it around and I came up with using the torsion bar wrench on a bicycle axle nut and then putting the dial wrench on it to see if the reading matched. It did. Then, I went ahead and checked the Craftsman clicker wrench of the same vintage and recalibrating, and it came up with a match also. Then I did the torquing with the dial wrench and cross checked it with the torsion bar wrench, with all good readings. So, I'm just going to call them calibrated. Andy Phoenix You might check around for a lab. A phone call to these guys indicate rates of $35 to $55. http://www.teamtorque.com/index.html |
#5
|
|||
|
|||
Torque Wrench Calibration
wrote in message ... I was getting ready to install a replacement manifold on the old Mercury and it occurred to me I ought to be pretty sure my torque wrench didn't strip the aluminum threads. The Snap On dial wrench hasn't been recalibrated for 30 years and the Craftsman torsion bar wrench is too clumsy to get to some of the bolts. I was kicking it around and I came up with using the torsion bar wrench on a bicycle axle nut and then putting the dial wrench on it to see if the reading matched. It did. Then, I went ahead and checked the Craftsman clicker wrench of the same vintage and recalibrating, and it came up with a match also. Then I did the torquing with the dial wrench and cross checked it with the torsion bar wrench, with all good readings. So, I'm just going to call them calibrated. Andy Phoenix Calibration can be like measuring with a micrometer and cutting with an axe. Unbrako says that torque wrench accuracy for generating the clamping force is +/- 25%. For a 100 in-# set click you could be providing 75 or 125in-# instead. How close a calibration to "truth" is needed? Stu |
#6
|
|||
|
|||
Torque Wrench Calibration
On Jun 29, 10:20*am, "Stu Fields" wrote:
Calibration can be like measuring with a micrometer and cutting with an axe. Unbrako says that torque wrench accuracy for generating the clamping force is +/- 25%. Stu True, clamping force and "torque" are not always a direct relationship. Thus the use of Torque-n-Turn specs (and other methods of overcoming thread friction). I've never seen any specs for AN hardware other than simple torque values. Do Torque-n-Turn specs exist for AN hardware? Yes, I know that AN hardware isn't "torque to yield" but the method is still of value for reusable fasteners. ================= Leon McAtee |
#7
|
|||
|
|||
Torque Wrench Calibration
Bill wrote:
Make it so that you can pull the torsion bar wrench with the snap on-- against each other. They should read the same. How could the torsion wrench be off if it zeros properly and nothing in the ponter binds? Bill Hale Loveland CO You are correct for a bending rod type wrench--but some torque wrenches have a spring loaded(adjustable)hollow handle that allows a piece to pop out of a Vee notch making an audible click that is also felt in the handle--(very handy for torquing where you can't see the dial or pointer. Jerry On Jun 25, 12:39 pm, wrote: I was getting ready to install a replacement manifold on the old Mercury and it occurred to me I ought to be pretty sure my torque wrench didn't strip the aluminum threads. The Snap On dial wrench hasn't been recalibrated for 30 years and the Craftsman torsion bar wrench is too clumsy to get to some of the bolts. I was kicking it around and I came up with using the torsion bar wrench on a bicycle axle nut and then putting the dial wrench on it to see if the reading matched. It did. Then, I went ahead and checked the Craftsman clicker wrench of the same vintage and recalibrating, and it came up with a match also. Then I did the torquing with the dial wrench and cross checked it with the torsion bar wrench, with all good readings. So, I'm just going to call them calibrated. Andy Phoenix |
#8
|
|||
|
|||
Torque Wrench Calibration
Jerry Wass wrote:
Bill wrote: Make it so that you can pull the torsion bar wrench with the snap on-- against each other. They should read the same. How could the torsion wrench be off if it zeros properly and nothing in the ponter binds? Bill Hale Loveland CO You are correct for a bending rod type wrench--but some torque wrenches have a spring loaded(adjustable)hollow handle that allows a piece to pop out of a Vee notch making an audible click that is also felt in the handle--(very handy for torquing where you can't see the dial or pointer. Jerry In the Air Farce we were supposed to click the break type torque wrench three times at the lowest setting before using it. This was supposed to spread the lubrication inside. I like the idea of taking the wrench to a shop to check calibration. Having said that, in my first shop in the USAF we calibrated torque wrenches so I may be a tad biased. The machine we used was huge and probably weighed close to a ton. Torque wrenches in the USAF are periodically calibrated, I forget the cycle, and taken in for calibration if dropped or abused. I wonder if the electronic torque wrenches are worth the money. Has anyone in RAH tried them? Dan, U.S. Air Force, retired |
#9
|
|||
|
|||
Torque Wrench Calibration
"Dan" wrote in message
... Jerry Wass wrote: Bill wrote: Make it so that you can pull the torsion bar wrench with the snap on-- against each other. They should read the same. How could the torsion wrench be off if it zeros properly and nothing in the ponter binds? Bill Hale Loveland CO You are correct for a bending rod type wrench--but some torque wrenches have a spring loaded(adjustable)hollow handle that allows a piece to pop out of a Vee notch making an audible click that is also felt in the handle--(very handy for torquing where you can't see the dial or pointer. Jerry In the Air Farce we were supposed to click the break type torque wrench three times at the lowest setting before using it. This was supposed to spread the lubrication inside. I like the idea of taking the wrench to a shop to check calibration. Having said that, in my first shop in the USAF we calibrated torque wrenches so I may be a tad biased. The machine we used was huge and probably weighed close to a ton. Torque wrenches in the USAF are periodically calibrated, I forget the cycle, and taken in for calibration if dropped or abused. I wonder if the electronic torque wrenches are worth the money. Has anyone in RAH tried them? Dan, U.S. Air Force, retired I have not tried the electronic variety; but my recollection is that the click type torque wrenches were supposed to be calibrated annualy--so long as no incident occured, such as dropping or other abuse. Peter |
#10
|
|||
|
|||
Torque Wrench Calibration
snip
In the Air Farce we were supposed to click the break type torque wrench three times at the lowest setting before using it. This was supposed to spread the lubrication inside. I like the idea of taking the wrench to a shop to check calibration. Having said that, in my first shop in the USAF we calibrated torque wrenches so I may be a tad biased. The machine we used was huge and probably weighed close to a ton. Torque wrenches in the USAF are periodically calibrated, I forget the cycle, and taken in for calibration if dropped or abused. snip Dan, U.S. Air Force, retired Heck, Dan, in the Air Force there was an alternate torque measuring system that didn't even require a torque wrench. (PMEL calibrated, of course) Simply "strip" it and back off one half turn. Farm boys from Georgia taught me that. Old Chief Lynn |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Thin 3/8" wrench | RST Engineering | Home Built | 10 | November 17th 06 12:52 PM |
Flight wrench question | R.H. | Piloting | 14 | June 25th 06 03:48 PM |
Ignition lead nut-wrench | jerry wass | Aviation Marketplace | 0 | April 8th 06 03:55 AM |
Wrench size for KI214 & KI201 OBS knob | Roy Page | Owning | 7 | March 11th 05 10:07 PM |
Volkslogger Calibration | Ray Lovinggood | Soaring | 5 | September 13th 03 04:56 PM |