Hello,
I am working on assembling a CNC foam cutter. There will be 2 stepper motors for both the x and y axis. I also plan on messing around with building my own controller. How can I ensure that both motors start at the right step when powering up the controller IC? If I build my own discrete control system using a uC or FPGA and I am microstepping can I just apply the same current pattern to both drives and they will both start from the same position?
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07-24-2006, 10:16 PM #1
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Stepper Motor Control Upon Startup
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07-25-2006, 12:56 AM #2
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When you turn off the machine, you will not know the exact microstep state of the steppers. When you turn on the machine, the state will be the Reset state; whatever you or the chip manufacture has decided it will be. Therefore you could be off several microsteps. It is usually not a problem. A step is 1/200 of a revolution. You then have to combine this with the tpi of the screw to transform it into a movement. For foam, I would think it inconsequential.
You could always just use home switches and return to them after/before every operation.
Steve
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