Quote:
Originally Posted by OzEclipse
Russ,
Thanks, I've been looking for something like that for my lightweight eclipse mounting and my Polarie. I've been thinking about custom making one for some time. Thanks for the hint. I found a possible supplier (Profilium) on line. I'll give them a try first rather than put you to the trouble of having to freight the stuff to me.
When you make that double arm drive, get in touch. I have an excel spreadsheet for optimizing the dimensions and modelling the error profiles of the type 4 isosceles platforms. It isn't very user friendly. I didn't make it for distribution so it needs a fair bit of driving.
Many years ago, I came up with a modification to the type 4 that greatly increases the drive time to almost 4 hours with theoretical ±1 arc sec drive error, plot also attached. I have my doubts that it would be quite that accurate unless you were very precise with the construction but even if you fall a bit short it would be pretty amazing.
I would be happy to optimize a set of construction dimensions and produce an error plot for you. I've attached a couple of examples of the sort of performance you can get from a type 4.
cheers
Joe
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No probs!
I am working out what materials I should use, I might use aluminium. Do you have optimised dimensions for M6 x 1.0P threaded rod? Running @ 1RPM? That would be awesome if its not too much to ask!
