Hi All,
Had an idea the other day when I came upon these steppers with control boards but wasn't 100% sure of the connections so with a bit of advice fron Bojan I hooked it up and away it went.
The aim is to build a Focus control to fit to the crayford for fine adjustment without bumping the scope.
As I'm still using an SLR for imaging this is a problem when trying to achieve good focus even with live view.
So this will when fitted allow very precise control, as with the encoder I used to control it (a volume encoder from a car radio) this is the type that just keeps going around when turned with no stops, it has 40:1 reduction because the gearbox in the stepper is a 60:1 for a start.
The result is plenty of torque. precise control, running at 5V with a holding current of 0.25A running of 0.2A
All I have to do now build a nice neat version of it and fit it up, still need to come up with a clutch or something for the drive as yet.
Here is a short
Video to show control movement.