Torque with a claw foot?
- Thread starter John S
- Start date
I think it does.....
Using Harold Vaughn's "Olde Engineer's Trick" logic I will suggest that if the offset on the crowfoot equalled 1 foot of offset then each pound you applied IN LINE WITH, AND INCREASING THE OFFSET would add a foot-pound.
Therefore if the offset is 1 inch, then each pound will add an inch-pound.
Unless you turned the wrench around so it's running back over the centerline of the bolt in which case it would SUBTRACT an inch-pound.
Therefore I'd ignore it and torque to 25-30ftlb
me
I think it does.....
Using Harold Vaughn's "Olde Engineer's Trick" logic I will suggest that if the offset on the crowfoot equalled 1 foot of offset then each pound you applied IN LINE WITH, AND INCREASING THE OFFSET would add a foot-pound.
Therefore if the offset is 1 inch, then each pound will add an inch-pound.
Unless you turned the wrench around so it's running back over the centerline of the bolt in which case it would SUBTRACT an inch-pound.
Therefore I'd ignore it and torque to 25-30ftlb
me
Cool.
I thought it would add some amount.
For my use, I will ignore.
Torque turn
Torque up a similar nut and measure how many degrees it moved from hand snug until proper torque is achieved. On the piece you can’t get on with a socket, snug up and turn it the same amount of degrees. We have some pumps at work that require over 1200 ft.lbs and are critical to have all 20 nuts evenly torqued. With our thread pitch, 60* and everything works great!
Torque up a similar nut and measure how many degrees it moved from hand snug until proper torque is achieved. On the piece you can’t get on with a socket, snug up and turn it the same amount of degrees. We have some pumps at work that require over 1200 ft.lbs and are critical to have all 20 nuts evenly torqued. With our thread pitch, 60* and everything works great!
Anything that changes the length of the lever arm will alter the torque reading.
Even a straight extension that is at an angle.
If you make sure the extension is truly vertical, the affect goes to zero.
It is not all that hard to correct for things like a crowfoot.
The center of the square for the ratchet to the center of the crowfoot.
It may be within the error of the torque wrench though.
Errors of 4% to 5% are pretty common in torque wrenches.
Unlubricated threads are another cause of error.
The threads galling will disturb the torque reading.
Even a straight extension that is at an angle.
If you make sure the extension is truly vertical, the affect goes to zero.
It is not all that hard to correct for things like a crowfoot.
The center of the square for the ratchet to the center of the crowfoot.
It may be within the error of the torque wrench though.
Errors of 4% to 5% are pretty common in torque wrenches.
Unlubricated threads are another cause of error.
The threads galling will disturb the torque reading.