Mach3 vs EMC2:
I started my retrofit with the intention to use EMC2 but changed to Mach3 because of the superior support from users and forums. I haven't run into any stability problems in over a year of almost daily use. I have heard that there are some glitches in the "run from here" feature where you can restart in the middle of a program. EMC2 doesn't even have that feature (as I understand).
I wouldn't use stability as a major factor in the decision.
Stepper vs Servo:
Using Geckos and servos will work just fine but there is not much difference than using steppers. Since Geckos use the same step and direction pulses as steppers, it is a limitation of the true advantage of servos. EMC2 and servos would be the better choice if using servos since EMC2 closes the loop internally rather than depending on the motor controller.
A stepper motor system will also work very well. If you are not looking for that extra speed, you will likely never notice the difference between steppers and servos.
Resolution with a servo is determined by the encoder used. With both steppers and servos, higher resolution will increase the need for a faster processor.
Originally Posted by
Meenbombs
I wanted to run Gecko drives because I haven't seen anything bad about them but the motors draw 100% of the drives rated output. That isn't good for the drive
Why do you think this isn't good for the drive? If the drive is specified to deliver the current, it can deliver the current. Geckos are designed to have sufficient headroom as to be no problem.
Originally Posted by
Meenbombs
I am pretty sure I will be underutilizing the motors so they shouldn't be drawing the full 8 amps.
Stepper drivers are a current source. If they are set for 8 amps, they are always running at 8 amps. If you want to under utilize the motors, you can set the current for less than 8 amps. But then your previous comment doesn't apply.
Originally Posted by
Meenbombs
I am looking at the C11G available at CNC4PC for a BOB. Does anybody have feedback on that board or suggestions for a better one?
I don't have direct experience with this BOB because I made my own, but it is one that is used a lot without issue.
Good luck!
"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away." Antoine de Saint-Exupery (1900 - 1944)