This is a home built equatorial platform. It uses a commercial stepper motor and controller unit purchased from Affordable Equatorial Platforms. This motor is quiet, powerful and smooth. There is no vibration at all at high power (300+ power). The unit has a coarse speed control fixed to the base and a fine speed control on a hand unit. The platform has a built in dual bubble level, a compass for aligning on magnetic north, and an adjustable rear (south) foot for leveling. I wired in a hi-speed reverse switch to automatically reset the platform after it reaches the end of its travel (in about 1 hour). Auto reset takes about 3 minutes but a manual reset can be simply done in a few seconds. The only problem with the platform is that sometimes after resetting the auto reset switch won’t return to drive and must be flicked back to drive by hand.
The platform is built for 35 deg. N latitude. But the adjustable foot will let you use the platform a few degrees north or south without much error. Tracking is excellent for visual use and works well for short exposure imaging (such as webcam). It is not accurate enough for any long exposure photography. I used the platform with my 6” dob, but it will easily handle an 8 or 10” dob as long as the center of your altitude bearing is no higher than about 26 inches from the ground.
NOTE: The top board on the platform is sized for three ground board feet on a 9" radius. If your ground board feet are on a larger radius, you will have to move them inboard, or attach another board to the top of the platform to make more room. I would not go larger than about a 10" radius or there might be stability problems. The unit runs on 12V Dc power (battery not included).
The platform needs to be on fairly level ground to work properly.
I’m asking $175.00 plus shipping.