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Also made an auto-focus unit
After doing the previous two mods I was satisfied this focuser would perform well enough to make an auto focus unit for it. The unit uses a stepper motor to drive the focus shaft via a small toothed belt - zero backlash. An Arduino based controller does the controlling. ASCOM focus driver in C# controls the unit via usb serial port. Whole unit designed in AutoCAD Inventor and parts machined on home CNC mill and anodized at home. The electronics is just hooked up to allow experimenting with stepper driver and controller. Final step is to add temperature compensation. The whole unit works very well with FocusMax and MaximDL.
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