Chuck, I intended to have the motor on a pivot so that I could easily disengage the drive but it proved too difficult to get the required rigidity. Now I am thinking of having the worm wheel loose on the shaft with a fixed wheel that I can drop a pin through.
Dean, I have three of these motors so naturally I choose to use the one that fitted in with the colour scheme!
Rob, I have not yet designed a control for it, so far I have just been using a variable voltage power supply. Maybe I will use a simple idea I have of being able to control it via a PC serial port, a very simple concept which gives 10 speed steps but I need to put a bit of thought into that one. If I do have PC control of the motor and I figure out how to read the DRO signals I could start on a CNC development programme. I have most of the bits for similar drives for Y and Z (knee lift).
Thanks for the comment Don.