We have investigated the cheaper MKS closed loop encoder and determined it's actually more precise than the MisfitTech more expensive one. Despite having a 12 bit rather than a 14 bit encoder. Smaller increment per bit.
They are both open source.
The MKS does calibrate for the alignment of the magnet and encoder. Still better well aligned than not.
It seems to run in standard microstep mode then correct if it gets out of place.
It makes slewing faster than standard drivers.
It has a pulse and the motor shudders very slightly every time it reaches the zero point, exactly on the index. That is likely the correction taking place once per revolution. It is also the likely cause of the moir¨¦ pattern when used in 3d printers. Because of that and the desire to sell to the printer market, I expect there may be future refinements. Even if MKS don't do it, its open source. Likely they will release updates to flash it with in any case
For astrophotography, which is demanding with long exposures taken while tracking sidereal motion, it works without problem.
Another toy in the tool box.
For you though Ralph I think the TMC5160 would be the way to go. Use low or 0 microsteps if you need to move at speed to get the tool in or out of place, what we call slewing from one spot to another during go to moves, then switch up to a fine rate to make the cut where movement is slower; somewhat equivelant to our guiding during long exposures.
Adjust the rate on the fly to suit.
If that's practical within torque/speed limits for your motor/application. As I've said before, I know nothing.
Be aware there are several build variations of the 5160 from different producers trying to make them compatible with various common printer boards.
Read data sheets. Look at pictures of the specific board to check pin arrangements. Make sure the SPI is implemented. Figure out what you need before you buy.
Have fun.
I may sometimes be slow to reply. But if you have questions I will try and find the answers for you. Remember that I know nothing though. I'm just a curious cheerleader who likes interesting things. However, others I talk to know a great deal. As John does here.
Ant?
