Quote:
Originally Posted by ChrisM
Thanks Dave Steve & Brett for your suggestions. I like the windscreen wiper motor idea, especially as they should be cheap. Using two - spaced 180 degrees apart - to provide a couple rather than a moment, might produce smoother turning, but I suspect that I would try just one initially.
Brett, what are the pros and cons of having the positional encoder on the drive motor/gear rather than on the dome itself. The latter would surely give absolute position, but would obviously need some sort of coded scale (gray scale?) around the entire 11.3 metre circumference. I guess that if the drive system did not ever slip, it would be simpler to have it on the drive itself.
Thanks too for the link to the Lesve dome driver site. I had not heard of this one previously and note that the PCBs should be available through Jaycar.
Chris
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Chris, you might want to have a look through this thread.
http://www.iceinspace.com.au/forum/s...light=velleman
A bit about the Vellerman kit in here and LESVE
Edit: oops, sorry Chris, you came in at post#7
Rally,
as for having two versus one drive....only really me visualising
what sort of problems I might have.
Two for a friction roller situation based on one might slip.
Two for a geared / meshed situation because I can picture one
trying to drive the dome off centre and a lot of pressure on my
centreing wheels. (I have 5 centreing wheels)
Two would eliminate most of the tendency for the dome to want to
drive itself out of mesh off centre.
I only know this because of years of hand pushing the dome from
the inside at one push point and seeing the transfer of that force
straight on to the centreing wheels. Probably panicking for nothing
but I think Chris would be in a similar situation too with his Garlitz
Geo.
Steve