Mintjulip,
I admit that my pile driver analogy doesn't exactly describe his problem as stated but as for not having any "physically possible interpretation", maybe you should have directed that criticism toward Machinery Handbook so that they can remove their discussion and formulas dealing...
Nuisance,
Yield strength is a property of the material. Just as ultimate strength, fatigue strength etc. are. Stress, on the other hand, is the result of a load or force being applied to that material. There is no such thing as yield stress. It is only stress and you must design your gadget so...
tnteng.
I believe that the way the force is being applied makes this a simple f=m*a formula. The only reason that the pipe will roll is it's resistance to sliding. No torque is being applied. I believe that the point of application of the pusher arm to the pipe and the point of contact of the...
Trainguy,
It sounds like you might be describing a pile driver. If so then you are looking for an "average force of blow" Which =(W*S)/d where W is the weight of the pile driver; S is (distance that the weight falls plus the distance the pile is driven) and d is the distance the pile is driven...
aggieengineermb,
According to the textbook "Mechanical Engineering Design" (McGraw Hill) by Shigley and Mitchell (Pi times mean diameter times Length of engagement)/2 equals the shear area of thread required to cause the internal thread and the external thread to shear simultaneously. This is...
Olympic,
Re: the above reply. The last sentence should state: I have personally seen the flat surfaces of ductwork disintegrate due to resonance caused by vibration transmitted thru airflow.
Olympic,
Is this purely an academic problem, or is it real? if it is the latter, then I would probably fire the designer. No load transmitting sheave should be located so far from a bearing or restraint that shaft whirl could even be a matter for consideration. If it the former, then you must...
If you simply want to compare torque forces between different bearing fits, lubrication, and shaft materials, I suggest a method I once used for a tool bearing analysis on a electro-mechanical device. I fabricated a pendulum that approximated a simple pendulum and with that and a stop- watch I...
Kreker, I have an old Delrin design handbook by DUPONT (1967). The information you are looking for is contained within. However, the data are for the various compositions of delrin acetal resins so I don't know if it will be of any help to you
