Search results for query: *

You can also multiply the density of your grain flow with bearing load of the spoke and velocity of the flow squared to get the force exerted by the medium. Basic fluid dynamics, F = p A v^2 = kg/m^3 X m^2 X (m/s)^2 = N. Regards, Cockroach

I have done this before, using elliptical relieves instead of standard rounded fillets in the corners of stepped shafts. Usually 3:1 ellipses give the lowest concentrations of stress, about 25% less or so. Is this what you are trying to do? Finite element on the shaft is how I solved my...

Just look up Lifting Capacity for threaded fasteners in any decent book on mechanics. Or Google it, many engineering websites spell it out in detail. Regards, Cockroach

Google Rzeppa Joint. I have very good success reverse engineering one for use in drilling applications, oilfield, Western Canada. Regards, Cockroach

I don't think it is that easy, the first sentence in the section on stress says it all. Thread stress computations are complicated! The Buttress is a tapered thread form and therefore, equations associated with shear and bending are not the same as those for a straight thread. Several studies...

Handle it like a cantilever beam with shear, bending, rotation and deflection. You can correlate deflection to shear in the linear range of the material by calculating the bending stress at the support of the cantilever. Regards, Cockroach

No, you approach the problem egronomically. Have a technician press on the piece repeatably for eight hours a day, five days a week. Correlate acceptance to rejection critia; what can go wrong? Define some level of acceptability between mating pieces and break out operator induced rejections...

Yes, I upgraded ProE to SolidWorks. That software took care of the issues you raised and solved a lot more problems than I had experienced to date. Perhaps you need a friendlier software package and support group who actually care about the end user. ProE boys just want to sell you the...

Would it not be a safety issue? Usually this is where I get the resistance. NPT forms are particularly weak in shear, any side load, wanted or unwanted, would snap the relief valve off at the stem. This would have a tremendous amount of safety concerns given your medium is a jet fuel. Often...

Unbrako is a good reference. Regards, Cockroach

Pardon me...OD is 1.352 inches or about 1 23/64 inches. Forgot the factor of safety to be 1.25 inches. Regards, Cockroach

Using mild steel (43 ksi) typical of off the shelf tubing, I get an OD of 1 3/16 inches. This assumes your 24 kip pre-load with 8.5 kip external compressive load will give you a factor of safety of 1.25. As noted, you want to resist collapse in which case the pre-load would be lost...

A dime a dozen in Canada. Try any pipe supply house in Edmonton or Calgary. Regards, Cockroach

You know what? I'm going to take this on and develop it. What is the required centre-to-centre distance for the thru holes (i.e. ears) and those of the bolts? Safe working load is 10 kips, but the design will be tested to 30 kips, FOS=3. I hope those set screw looking fasteners in the front...

Basic physics. What is the angle of an inclined plane given a block of known weight subject to friction? Figure it out using a textbook example and comparing it to other known problems with solutions. Then make the inclined plane move at some prescribed velocity and ask the same question...

This is a first year physics problem, you do it in one of those lab seminars on springs. It is not complex, finding iterative solution sets because there is a worry about standing waves translating through the spring. For God's sake man, this was solvable in Newton's day without computers...

Energy of Distortion Theory, 0.577 X yield strength. Regards, Cockroach

Yeah, I agree with Applico and TheTick. Manners have been horrible in this forum for quite some time now. Anyway, toy cannon scenario. Load a marble and compress the spring, trigger release. How far will the marble go? The range is dependent on angle of trajectory and muzzle velocity off...

In practice, I would solve it mathematically for the specific equations and orientation of each cylinder in 3D space. Problem is beyond the scope for this forum, you need to use multi-variable calculus and manifold theory in order to get what you are after. I suggest going to a mathematical...

The purpose of a knurl is to build up the OD of a piece intended to be an interference fit with another piece. As such, knurling is often used to fix a machining error in over turning a shaft. We're talking thousands of an inch over diameter in this case. I have seen knurls being used in...