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A 6 foot polar disc now that BBBIIIGGG.
Mine is 700mm solid steed with SS rim .
The polar shaft is 90mm solid steel.
The DEC shafts are 11/2"solid steel and the 700mm DEC drive disc is made from a laminate of ply and fiberglass with a SS rim epoxied to the outside.
My servo controller is a Mel Bartel unit and is usable in alt az or eq mode and go-to capable via charting software.
The motors are pittman servo motors running at 12v.
The drive primary reduction is 15;1 with intermediate reductions as well adding up to 2200:1.
The Bartel servo drive kit is a very versatile and powerfull set up capable of all sorts of error corrections from PE to shaft orthagonal errors ect ect and able to be adapted to just about any mount.
Mark
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