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Originally Posted by Wavytone
Use FEA to work out where this flexes (and where it doesn't) in order to work out when it needs stiffening, and where you can trim the lard off it ? My guess is you could halve the mass without much difficulty, and easily done if this is to be produced by CAD/CAM.
With a telescope on top and thus sitting on a pier or tripod, stiffness is best measured by the frequency is oscillates at when a step or impulse load is applied - the higher the frequency the better.
The second characteristic that matters is how fast the oscillations are damped - the faster the better. In this respect lighter mass is a huge advantage - the amplitude is reduced, and the damping is faster in comparison to a similar but heavier design.
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Wavytone,
Would it be beneficial to run stress tests on individual parts in approximately where the loads would be and then run a full analysis on the fully modeled assembly?
I haven't particularly been focusing alot on weight reduction, yet.. Just making sure that the mass of each part was reasonable. I actually forgot all about the resonant frequencies, and how that affects the stiffness! Thanks for that!
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With regards to making the worms and wheels, you can use a precision threaded rod that has been cut down part of its length to act as a thread cutter. Use a small portion of the rod to do the cutting and another part of it will be your worm.
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I don't think i've seen that yet, I have seen someone on this forum making their own worms and wheels with the same technique/similar I believe. It seems pretty promising and I think ill have a go at making some like that. I don't know how great the PE will be by using presicion threaded rod, rather than making one from scratch. But it does make things easier!
Thanks Cam, Im trying my best on this project haha
