I'm converting my 10" dob to a portable truss-dob so I won't be needing this anymore. It's cut for 42 degrees latitude, but could be tilted a few degrees either way. This is a 3-point platform with tangent arm pickup driven by a DC stepper motor and homemade gears and lead screw (South Bend lathe). Runs for about an hour before it has to be reset. It will hold up to a 10" sonotube dob and probably up to a 12.5" truss-dob.
The sector is 1" plywood. The mount is oak. The bearing blocks are padauk (a very hard wood). The stepper motor electronics go in the long black box. The hand paddle needs to be resoldered to the stepper motor circuit board (schematic included). The worm holder needs to be permanently attached to the mount (I just used a C-clamp <g>). I'll throw in 4 new bearings to replace the ones under the sector. The ones in the gear system have already been replaced with better bearings.
This is NOT a turnkey platform. It will take a little work to get it fully operational again. I don't have time for it. I'm too busy building a custom oak staircase (seen in background).
Email questions accepted (even if you just want to talk about building platforms).
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