Quote:When faced with difficulty in achieving a specific rotation rate, one can design for a longer or shorter hinge-to-drive rod distance. There is no reason to be hidebound to 1 RPM.
George You know you're getting on when the equipment you farmed with is showing up as suburban lawn ornaments.
Everything depends on mind.
8"GSO dob, EQ platform, a case full of EPs
Quote:555 DC motor control does not give constant speed over different load.
Quote:555 DC motor control does not give constant speed over different load.Try 555 pulse generation + stepper motor. You will get much better speed control. Only limit is temperature dependence of 555.http://www.ebay.com/itm/290758877302?ssPageName=STRK:MEWAX:IT&_trksid=p39...Stepper motor and controller cost only $8.
Ed Jones ........... The best data is an interferogram, the best analysis is from an honest optician.
Yes, I too have telescopes and all of them are Go-To. Wherever I push them, that's where they Go-To. "When you earnestly believe you can compensate for a lack of skill by doubling your efforts, there's no end to what you can't accomplish"
Quote:Not sure what the fear/problem is with using an AC timing motor. They've been used for years for purposes just like this and they sure makes things much much easier.