Gday Simon
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I think ioptron would be using the type described in the video's though,
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I knew roughly what magnetic "gearing" was when i wrote my post, but couldnt see how/why it would be used in a scopes drivetrain.
Most magnetic gearing i had heard of was for heavy duty work, or had dynamic "give" in it under load, which would cause PE/tracking errors in a scopes drivetrain.
What it looks like is the the post should have said was it has "magnetically loaded" gearing. The encoder version of the CEM60 uses a bog std 1.8deg stepper, with a timing belt drive, but the worm carrier is apparently held against the worm using a magnet, not a spring. Havent seen any piccies yet tho :-(
Andrew