Quote:
Originally Posted by alistairsam
Nice work Nico,
Would you have a link to the controller and The stepper?
I like the simplicity and smoothness, should do the job well.
Is that a 7.5 deg stepper with a gearbox?
Just a suggestion
I'm a fan of micro stepping and I think you could get finer movement with a 1/16th controllerlike the allegro A4988 stepper controller, a 555, and your encoder switch with a 1.8 deg motor like this one
http://www.robotgear.com.au/Product.aspx/Details/459
This is the controller
http://www.robotgear.com.au/Product.aspx/Details/561
This video is a test of 1/32 micro stepping with a different controller where I'm sending a train of 6400 pulses for one rev. So one manual step pulse would yield very small movement and you could have one pulse per encoder tick.
http://m.youtube.com/watch?v=53tgJ4pwn1w
I know micro stepping yields lower torque, but current is adjustable and torque should be ample for a focuser.
I'll be making one with a simple lcd display that shows the number of steps.
Just need to think of a home position routine.
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Yep love the idea of micro stepping as well and the stuff you linked to looks the bees knees.

The bits I'm using will do the job although not a small step size, 5.6 deg I think it was, the gear reduction solves that issue but with the slight dissadvantage of a small amount of backlash in the gear set, not significant enough to cause a problem at my level of imageing though.