Calibrating Torque Wrenches
Do you need a certificate saying it is calibrated, or do you just need to know if it is in specs? I calibrate, but we dont do torque wrenches. I might be able to get someone to do it in the Marines, but you wouldnt get a cert or anything just a its good. I there are a couple of places here in SD like Simco and Micro Precision. I dont know how much they charge though.
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Thread Starter
Joined: May 2007
Posts: 2,793
Likes: 16
From: under a JEGS hat
I don't need a cert or anything, just an "OK, it's good to go" verification and if possible, recalibration. I'll probably verify it on my own using a bench vise and tying a 25lb weight to the handle.
BTW, I'm looking for places in the LA/SFV/SGV area, possibly open for pickup/dropoff on weekends.
Not even sure the cheap *** wrench I have is capable of being calibrated. lol.
BTW, I'm looking for places in the LA/SFV/SGV area, possibly open for pickup/dropoff on weekends.
Not even sure the cheap *** wrench I have is capable of being calibrated. lol.
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On The Tree
Joined: Feb 2007
Posts: 161
Likes: 0
From: S. Cali
I don't need a cert or anything, just an "OK, it's good to go" verification and if possible, recalibration. I'll probably verify it on my own using a bench vise and tying a 25lb weight to the handle.
BTW, I'm looking for places in the LA/SFV/SGV area, possibly open for pickup/dropoff on weekends.
Not even sure the cheap *** wrench I have is capable of being calibrated. lol.
BTW, I'm looking for places in the LA/SFV/SGV area, possibly open for pickup/dropoff on weekends.
Not even sure the cheap *** wrench I have is capable of being calibrated. lol.
How much you willing to pay to do it without a cert?
Thread Starter
Joined: May 2007
Posts: 2,793
Likes: 16
From: under a JEGS hat
Where would you calibrate it from? (just thinking)
Seems like it would be tough to do with a weight, because its Force x Distance Perpendicular.
So 25lbs at the end of the handle would be different then 25lbs at the middle of the handle, and again different from the top.
Im assuming you would want to put the weight at exactly 1' from the axis. Or 2x the weight at 1/2 the distance, depending on how long it is. its also going to have to be as horizontal as you can get it.
25lbs x 1ft = 25ftlbs
50lbs x .5ft = 25ftlbs
That would atleast allow you to get pretty close. I wonder if you couldnt set the weight at a location so you could still turn the handle to see exactly when it was 25ftlbs. Maybe start at 35ftlbs and see when it finally clicks, when adjusting the torque wrench. *** I dont know if this is bad for the wrench or not.
Going to have to make sure your weights are accurate too.
Then i would do it at say, 25, 50, 100... so you can see if its just off 2lbs across the board, linear or exponentially off.
Seems like it would be tough to do with a weight, because its Force x Distance Perpendicular.
So 25lbs at the end of the handle would be different then 25lbs at the middle of the handle, and again different from the top.
Im assuming you would want to put the weight at exactly 1' from the axis. Or 2x the weight at 1/2 the distance, depending on how long it is. its also going to have to be as horizontal as you can get it.
25lbs x 1ft = 25ftlbs
50lbs x .5ft = 25ftlbs
That would atleast allow you to get pretty close. I wonder if you couldnt set the weight at a location so you could still turn the handle to see exactly when it was 25ftlbs. Maybe start at 35ftlbs and see when it finally clicks, when adjusting the torque wrench. *** I dont know if this is bad for the wrench or not.
Going to have to make sure your weights are accurate too.
Then i would do it at say, 25, 50, 100... so you can see if its just off 2lbs across the board, linear or exponentially off.
You might be able to get a calibration procedure from the manufacturer it might tell you how much weight you need where to put it and the orientation of the torque wrench. I would give that a shot.
On The Tree
Joined: Feb 2007
Posts: 161
Likes: 0
From: S. Cali
Just so you know, I do this for a living.
For calibration of a torque wrench it'll be about $50, but it depends on the range of the torque wrench. Now this might not include adjustments because sometimes parts are needed if they can't be adjusted via the screws.
Now it's weight x distance = force
Weight would need to be on the middle of the handle.
The points that are ALWAYS checked at 20%, 60% and 100% of the full scale. Tolerance is ±4% clockwise.
Oh and the MFR might not give you any adjustment procedures.
For calibration of a torque wrench it'll be about $50, but it depends on the range of the torque wrench. Now this might not include adjustments because sometimes parts are needed if they can't be adjusted via the screws.
Now it's weight x distance = force
Weight would need to be on the middle of the handle.
The points that are ALWAYS checked at 20%, 60% and 100% of the full scale. Tolerance is ±4% clockwise.
Oh and the MFR might not give you any adjustment procedures.
Thread Starter
Joined: May 2007
Posts: 2,793
Likes: 16
From: under a JEGS hat
Just so you know, I do this for a living.
For calibration of a torque wrench it'll be about $50, but it depends on the range of the torque wrench. Now this might not include adjustments because sometimes parts are needed if they can't be adjusted via the screws.
Now it's weight x distance = force
Weight would need to be on the middle of the handle.
The points that are ALWAYS checked at 20%, 60% and 100% of the full scale. Tolerance is ±4% clockwise.
Oh and the MFR might not give you any adjustment procedures.
For calibration of a torque wrench it'll be about $50, but it depends on the range of the torque wrench. Now this might not include adjustments because sometimes parts are needed if they can't be adjusted via the screws.
Now it's weight x distance = force
Weight would need to be on the middle of the handle.
The points that are ALWAYS checked at 20%, 60% and 100% of the full scale. Tolerance is ±4% clockwise.
Oh and the MFR might not give you any adjustment procedures.
