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You are also weakening the general area of the bolt ring, ultimately you'd end up with the old 'please tear here' perforations.

NO. The rotational inertia of the disc is the same on Earth as it is on the moon.

OK, I'm gobsmacked by the weight. Meanwhile the rest of the world is fitting carbon fibre wheels to save 10 kg? Yeah sorry the agony of working in imperial means I have no feel for the right answer. Wagging it In metric I is about .6 kg m^-2, T=21*.6=12 Nm Hence power is 115*12 W, about 1.5...

An automotive brake rotor doesn't weigh 32 lb.

There's more to the mechanism of a torque wrench than a spring. You'd have to check for wear or compliance in all the pivots and the ratchet and so on.

Leaf springs and coil springs don't sag, beyond a preliminary shift as the abutments (generic) dig in, if they are properly designed and not massively overloaded. Sometimes somebody has a fit of conscience and designs a coil spring so it is coil bound before it yields. In cars that is more by...

Stress_Eng - yes, that is the question and when I get my script working, I'll be able to answer it. The problem with looking at SAE style leaf springs is that they are either multileaf or non constant thickness, rather than simple cantilevered uniform beams like this one, and in reality they...

But that's small beam deflection theory. As the ends move in the moment drops and so the non linear solution is stiffer than the linear one (ultimately of course you end up with two vertical bits in tension, no bending at all). Cheers Greg Locock New here? Try reading these, they might help...

Thanks for finding the s equation, that adds another pipe but at least means i can debug my script Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

Turns out it was more than a 3 pipe problem, I've got one annoying error to fix, unfortunately it is rather important. Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

Damn. Well I've got the guts of a script to duplicate your model, hopefully it'll work tomorrow Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

Oh, rats. Can you dump the text fromat output files into a zip and I'll look at the length of each element as deflected to see if the axial deformation is significant? Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

Non linear beam analysis by hand is possible but rather tricky, typically iterative- that's why the SAE design guide for leaf springs is full of nomograms Otherwise it's a case of building a model in a different software and comparing the results. rb1957's point is interesting, I'd hope the...

Good stuff - now increase A but leave I the same. This will give you the sensitivity to the axial force induced elongation. Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

The beam is curved when under load. At the end the vertical force at the support is resisted by an axial force (beam coordinates) and the shear force. These resolve to give a pure vertical force at the support, usual triangle of forces stuff. Ignore my 25% 75% guess it was wrong. My guess is the...

There's no axial force at the ends, there's some sort of maximum near the 25% and 75% points. Think of membrane type structures. Sort of Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

SAE have a leaf spring design manual that includes nomograms for shackle angle, ie exial displacement of the end of the beam. However that seems an expensive solution to an obvious problem - the first assumption I'd make under SS at one end, SS+roller at the other, is that the neutral axis...

RW - I think you've cracked it, the big hex nut is labelled Zoom. Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

I don't think a celestial machine would need Z adjustment. Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?

No I don't since my employer paid for me to develop and validate it. Cheers Greg Locock New here? Try reading these, they might help FAQ731-376 http://eng-tips.com/market.cfm?