You can most definitely use two endmills, but the result will not provide optimum results for a design such as that.
Two things to do with the X-Controller:
- Set $1 to 255
- Set the dip-switches inside the X-Controller to cause GRBL to provide holding torque while the steppers are not being commanded to move.
After this has been accomplished, the machine should not move during bit changes. If you still lose steps during a carve then either the feeds/speeds are too high or the potentiometers within the X-Controller need to be adjusted to provide more current (or sometimes less…if the drivers are becoming limited) to the stepper motors during carving operations.
There’s a little bit of information regarding that in the X-Controller assembly instructions…
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Brandon Parker