Obtaining Old Reference - Torque Capacity Hex Features
Obtaining Old Reference - Torque Capacity Hex Features
(OP)
thread404-200026: Hex torque strength
Can anyone tell me how to get a copy of the old:
CASE, G.S. "Stresses on bolts-nut dimensions-wrench design, Mechanical Engineering, Sept 1927, pp919-925.
I would like to see if there is any additional treatment of the geometry fit factor CH in the torque equation
TH=CH*WAF^2*J*S*NC
Believe it or not, we use hex features, in range of 7-16 inches width across flats, to torque drive large horizontal process vessel agitators, and it works remarkably (almost unbelievably) well. However, I am trying to make some quantiative sense out of the design evolution. Prior to finding this relation, we had been using only exotic (and perhaps useless) non-linear ANSYS analysis.
Thanks!
Can anyone tell me how to get a copy of the old:
CASE, G.S. "Stresses on bolts-nut dimensions-wrench design, Mechanical Engineering, Sept 1927, pp919-925.
I would like to see if there is any additional treatment of the geometry fit factor CH in the torque equation
TH=CH*WAF^2*J*S*NC
Believe it or not, we use hex features, in range of 7-16 inches width across flats, to torque drive large horizontal process vessel agitators, and it works remarkably (almost unbelievably) well. However, I am trying to make some quantiative sense out of the design evolution. Prior to finding this relation, we had been using only exotic (and perhaps useless) non-linear ANSYS analysis.
Thanks!





RE: Obtaining Old Reference - Torque Capacity Hex Features
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I have used their document service a number of times. IT IS GREAT. They have access to A LOT of technical/scientific "stuff". I recall that their usual turnaround time is only 48 hours for a document to scan and email, but you can get it even quicker for an additional cost.
RE: Obtaining Old Reference - Torque Capacity Hex Features
RE: Obtaining Old Reference - Torque Capacity Hex Features
CoryPad: Before I launch into aquisition mode, do you remember if the article had any additional details that would be useful to purpose, or did it just baldly state equation?
Thanks again
RE: Obtaining Old Reference - Torque Capacity Hex Features
A hex key will never strip out an alloy screw. The most probable cause of failure will be the the hex key will cam out and if you can keep the key engaged it will twist or break. A point to remember is that the hex key becomes ineffective as a wrench at fastener strength levels starting around 180,000 psi.
ht
http://www.bondhus.com/tech-library/body-10.htm
http://www.holo-krome.com/handbook.html
RE: Obtaining Old Reference - Torque Capacity Hex Features
I have that article in a moving box somewhere (changed employers after I posted that), so I don't have it handy to look at. I seem to recall it had more than the equation - it had actual data and an empirical fit. The cost should be ≤ 30 USD, so it should be worth the effort, regardless.