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Old 15-07-2009, 04:21 PM
Wavytone
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Wavytone is offline
 
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
Old rule of thumb...

...used to be that the diameter of the worm wheels should be not less than half the diameter of the objective or primary mirror, and the diameter of the axes should be not less than one sixth.
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