Yesterday I ordered the next prototype of the NEMA 23 10A Smart Stepper. Earlier this week I ordered, what I hope is, the production boards for a 3.2A NEMA 23 smart stepper.
The smart stepper boards bolt on to existing stepper motor and turns it into an open source feedback servo. This prevents the motors from skipping steps, and provide positional accuracy down to ~0.05 degrees. Additionally the Smart Steppers when tuned properly offer lower power consumption, no more hot motors, and almost silent operation, no more humming. Additionally with the feedback people often get faster machine speeds as they can increase their acceleration and velocity without risks of missing steps. Currently at http://misfittech.net/product/nano-zero-stepper/ you can get the NEMA 17 version with up to 2A of current. The NEMA 17 version is great for 3D printers and smaller CNC machines.
The NEMA 23 10A is for larger machines, and with an adapter plate could be used on larger stepper motors. The 10A version will support power supplies from 20V-48V to get the maximum speed and performance from your machine.
For more information or question please contact me, or join the smart stepper google group: https://groups.google.com/forum/#!forum/smart-stepper
Of course the hardware and firmware is all open source!
Thanks
Trampas
http://www.misfittech.net