I’ve been slowly using my MPCNC while I learn how to use it. One common problem I’ve had is the machine cutting too deep (maybe -5mm instead of -1mm indicated on the controller screen). I think I’ve discovered the underlying problem: if the Z-axis motor isn’t engaged, the T8 rod more or less freely drops until the bit hits the material. When I turn on the spindle (DW660), I’m guessing the vibration allows the bit to sink into the material and it falls further down into the material and affects the zero position.
If I engage the Z-axis motor (by using the menu to move the axis up/down 1mm for example) it certainly holds in place, but usually I set up a cut by squaring the axes, using the menus to move X/Y/Z to my desired origin point, and cycling the power. (Sidenote: is there a better way to do this? Is there a ‘reset origin’ in the menu that I’m missing?) When I cycle the power, I usually get at least a 1mm droop into the wood, or perhaps more if it’s a thin v-bit, etc.
Any way to combat this?