I know this is an oldie but a goodie.
I have a perfectly good JMI 2" Crayford (non-motorised) focuser and want to PC control it via stepper control. JMI have sold the farm to Farpoint Astro and have ceased manufacturing these products (as at the end of 2018). I had a look at Farpoint's site and the stand-alone motors for the JMI focusers are out of stock so the choices are between expensive and very expensive. Hence a recent order on EBay for one of these:
https://www.ebay.com.au/itm/181925257317
a DC 5v 4-phase 5-wire Stepper Motor+Driver Board+Remote Control Wireless RC.
Anyone have any experience with these? I know there's an old thread here:
http://www.iceinspace.com.au/forum/s...hlight=focuser
Bojan pointed towards a commercial version of the controller on the BangGood site but in, too, is out of stock. So EBay it was. Look pretty similar.
The questions I'd like to ask include:
1. Has anyone actually built the gear/belt drive mechanism to attach to a Crayfor-type focuser?
2. Has anyone figured out how to PC-control one of these? It would be nice to be able to put it all together somehow.
Peter