Quote:
Originally Posted by alistairsam
the clutch plates are always engaged and the motor torque after reduction has to exceed slip torque of the clutches?
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Yes, this is how I did it on my eq mount (doesn't exist any more).
I did the same thing on my dobson.
And this is the case on other designs as well.
Quote:
Originally Posted by alistairsam
how is the plate usually fixed to the shaft? i found a few shaft collars that have bolts in them which i'm guessing can be bolted onto plates? any other methods?
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Well, that depends on the design.
In EQ6, you have shaft with its own bearings, then worm gear on the shaft with its bearing, and then the screw with brass button that slides with certain amount of friction in the groove of the worm gear, so the friction is adjustable.
Byers worm gears have friction clutch, very similar in design to car clutch - the friction is adjustable by 6 screws close to the perimeter, positioned at 60°. The bearings are machined sleeves (not ball bearings) if I remember correctly.
Have a look here:
http://al-paslow.smugmug.com/Other/1...13737962_usGSR
http://www.deep-sky.co.uk/telescopemaking/tm14.htm
http://cgi.ebay.com/Edward-Byers-Sta...-/250683190254
http://www.mirbinoculars.ru/index.php?productID=130