I just finished building a JGRO router with the HobbyCNC 3-Axis controller. To help justify all the time (and money) I'm investing in my new hobby, I promised my better half that I'd automate her quilting frame for her. I won't need nearly the power of the JGRO to move the sewing machine carriage around the frame and will probably buy another HobbyCNC board for that. But before I do that, I need to automate the take up roll. I designed a gear and chain setup to do this and I need to control motors to turn the roller.
I plan on putting one stepper motor on each side of the roller and turn them in synch (in opposite directions.) With the size gears I want to use, the motors will have to run somewhere around 300 RPM to move the material on the roller 2", and ideally this would happen in 1 second. I considered using DC motors, but would like the holding torque of steppers.
I'm looking for is a simple 1-Axis controller to run the two motors (Vexta PH266M-E1.2, 2-Phase, 0.9°/Step, DC: 6V, 1.2A). This won't be computer controlled, so I'm using mechanical switches to tell the motors when to run and which direction. The idea is that each time her sewing machine carriage hits a switch, the roller would either roll up or unroll 2" of material.
Any ideas on a cheap controller for this? I don't mind, and may even prefer, building my own. I'd also like some input on what size power supply I would need - I was hoping to keep it small enough to use a surplus laptop supply. Thanks.