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Quote:Harmonic drives have considerable PE but it is very long period
Quote:Harmonic drives don't need encoders. They are just another variety of gear reduction.
8" GSO RC with CSL Moonlite FocuserTelevue TV60isLosmandy G11 with Gemini 2 (with Ovision upgrade)
SBIG STT-8300m with Self Guiding filter wheel
A wide assortment of lenses for my Canon.
Quote:well all encoder-less mounts are shooting in the dark...
Quote:but with a main harmonic drive.. would it be possible that the inherent damping in the spline would suppress gearhead harmonics?
10Micron GM2000HPS, 10Micron GM1000HPS, SW NEQ6 Takahashi FSQ106 EDX III, SW 190MN, TS Riccardi 130 f/5.2 SBIT ST-8300M, QSI 683wsg8 SX Wheel, Baader 2" filters, Baader 36mm filters, Astrodon QSI filters http://astro.frejvall.se
Quote:and will repeat a position down to a 0.001* degree accuracy
Quote: PE can be finessed out of the equation with good software driving it.
TMB130SS 10" LX200GPS AT106LE Megrez 80II ED Triplet AT72ED Celestron 8" Edge HD Televue 85 Mewlon 250 ES AR152