Fixture for work piece while tightening bolt which requires high torque
Fixture for work piece while tightening bolt which requires high torque
(OP)
How to hold the work piece with radius at the outer side while tightening a bolt (into the work piece) which requires 1300 N.m torque.
My questions is; is there any readily available fixture for this?
Thank you very much
My questions is; is there any readily available fixture for this?
Thank you very much





RE: Fixture for work piece while tightening bolt which requires high torque
RE: Fixture for work piece while tightening bolt which requires high torque
2) skid steer with a 4 way bucket
3) depends on where and what is avalaible
instead of torque, can you measure and tighten using elongation
are you turning a bolt or nut, if nut you could use rotation to achieve desired elongation
RE: Fixture for work piece while tightening bolt which requires high torque
Band clamp
strap wrench
lateral clamps
machinable jaw vise or chuck
eccentric edge clamps
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
RE: Fixture for work piece while tightening bolt which requires high torque
are you really installing a piece that has no designed loadpath for installation torque ? sounds like a pretty crap design (if it is). i'm visualising a piece with a flat face and only one fastener through it ... no anti-rotation design features, no washers, no ...
another day in paradise, or is paradise one day closer ?
RE: Fixture for work piece while tightening bolt which requires high torque
Had to look it up- 1300 N-m = 959 ft-lbs.
Long ago, I remember the "nut" on the end of a hydraulic cylinder had notches in it, and a chisel and hammer in those notches would turn the nut. I don't think that required anything to hold the cylinder in place.
RE: Fixture for work piece while tightening bolt which requires high torque
another day in paradise, or is paradise one day closer ?
RE: Fixture for work piece while tightening bolt which requires high torque
I have seen nuts like those before on hydraulic cylinders - they are meant to be used with something like a collet wrench so you don't have to worry about the wrench slipping off.
Using a chisel & hammer does work, but would wear down the bolt waaaaaay before it reached design life
RE: Fixture for work piece while tightening bolt which requires high torque
RE: Fixture for work piece while tightening bolt which requires high torque
RE: Fixture for work piece while tightening bolt which requires high torque
Curious thing- there at that same shop, they had a 60" pipe wrench. Which is an uncommonly large and heavy and unwieldy size of pipe wrench. But the curious thing is that it was BENT. They had bought it specifically to try to use on those cylinder glands, and had pushed it with the bucket of another trackhoe and bent the wrench sideways a little.
Googling around a bit, I find this contraption, not sure just exactly how it is used:
http://www.ms-d.com/nutBuster.html
And I find a couple of rigs specifically set up to do shop work on hydraulic cylinders, and I assume they can undo that gland nut:
http://www.maruma.jp/pdt_hc_ss.html
http://www.tuxco.com/products/hydraulic-cylinder-s...
"can generate up to 30,000 lb-ft of torque to loosen threaded glands...then provides 5,000 lb-ft of torque at 8 rpm to quickly remove the loosened gland"
That's impressive when 8 rpm is considered "quickly" removing a nut!
I find hand tools for glands like that, but they seem to be very light weight relative to the items they attach to, and I think would have been fairly useless for the cylinders in question:
http://www.epsstore.com/index.php/cas1456.html
RE: Fixture for work piece while tightening bolt which requires high torque
Engineering is the art of creating things you need, from things you can get.
RE: Fixture for work piece while tightening bolt which requires high torque
RE: Fixture for work piece while tightening bolt which requires high torque
two options ...
1) invent a subspace dampening field, or
2) get a proper design ... show us a pic and why sensible solutions are not an option.
another day in paradise, or is paradise one day closer ?
RE: Fixture for work piece while tightening bolt which requires high torque
RE: Fixture for work piece while tightening bolt which requires high torque
Nett torque on the workpiece = 0.
Nett force on the workpiece = 0.
Result = workpiece does not move.
If the wrench is long enough say 2.5m, the bolt can be tightened by hand(s)- one on the wrench, one on the reaction lever and pull them together with a force of 520N. If the wrench is not long enough, you can winch the two towards each other with a ratchet winch or similar.
Engineering is the art of creating things you need, from things you can get.
RE: Fixture for work piece while tightening bolt which requires high torque
RE: Fixture for work piece while tightening bolt which requires high torque
Engineering is the art of creating things you need, from things you can get.
RE: Fixture for work piece while tightening bolt which requires high torque