Telescope encoder or no telescope encoder? #question


I'm in the process of constructing a 30" dobsonian telescope with friction drive on azimuth (5" friction wheel against a 30" disc) and altitude (large side bearings (54") on two horizontal shafts (1.4")), using Faulhaber motors including motor encoders, gear heads and harmonic drives (50:1).

Friction drives may result in slip. Are telescope encoders (Gurley) recommended, or are there experiences with systems like these without telescope encoders? Just installing them 'in order to be sure' is an expensive experiment.

KR, Frank

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