Question about slow motion alt/az locks
Posted 18 February 2013 - 12:04 AM
Posted 18 February 2013 - 05:21 AM
Does loosening them move the worm away from the gear so that the scope can be moved without damaging the gear?
The gears must always be engaged, these are worm gears and the adjustment of worm gears is critical. Basically the gear represents a shaft that is fixed to the mount that can be rotated by the slow motion controls. The scope is mounted on a shaft that is free to rotate, the friction adjustment/lock, adjusts the friction between the gear and the scope. The gears are strong...
The only mount I have ever seen that actually engages and disengages the gears is the 1960's vintage Asahi-Pentax mount for their 60mm F/13.3 refractors. Both axes use worm gears on levers that pivot. The lever serves to both engage the gear and as the slo-motion control. It's a sweet mount, best vintage 60mm I have ever seen.
Posted 18 February 2013 - 11:14 PM
This guy gives a good explanation of what I'm talking about. (It's in the friction clutch section)