I'm building a CNC mill based on Patrick Hood-Daniel's machines
I'm also playing with Arduinos, and I'm beginning to wonder if I have this right:
I have 5v 1A steppers.
I'll be using EMC2 (Linux-based CNC) to run the whole thing and I had intended to feed the output from the Ubuntu box that's running EMC2 into an Arduino that then splits the data and sends it to three stepper drivers, probably built with sn754410ne h-bridges.
I had thought of possibly building the controllers with an ATtiny2313 per motor.
Is this overkill? Is the Arduino even required or can I feed the h-bridges directly from the EMC2 output?
My main worries are that the Arduino won't be able to control three motors concurrently, although there is a new library available: http://www.open.com.au/mikem/arduino/AccelStepper/ that purports to achieve this, and also that I won't be able to get half-stepping (or finer) with this setup.