G-Codes for CNC
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As a complement to my post in feature request for CNC G-Codes.
Generally, the first operation before starting a cut is to make a zero on the corner of the plate/part to be cut. All CNC software have zero buttons but here we can use Macro buttons for that with a G92.M0/M1 stop/start - for tool change - or M6 for tool change (automatic ?)-
Typically, a M0 command stop the spindle, move the head to a tool change/calibration area and rise the spindle near max Z, as you need a good access to the to change the bit, and then you have to do the zero of the tool after installing it.
So, these G-code (M0 and M1) shall start macros.The zero is done either manually, moving the head till bit enter in contact with a plate, or with a contact switching when the bit touch it. Nothing really different from a Z-probe, except its is done DURING a cut session, so nothing else than the Z homing shall be done. A local command help a lot and often CNC are equipped with pendants.
If you have no local command, an automatic tool calibration is simpler to operate.M3/M5 start/stop spindle
Nothing special here, any Mosfet could be used to command a SSR or the stop/start of an inverter and also stop the chip aspiration, if this is not done when stopping the spindle. Often spindle and aspiration are just coupled.M8/M9 Coolant on/off
Simple on/off of one available MosFet
M10/M11 : Vacuum (for part maintaining) - lower priority
Simple on/off of one available MosFet
Sn : spindle speed- Frequently inverter speed is controlled with a 0-10V signal. So some circuitry is needed. A high frequency PWM with a capacitor may be ok. The 10V can be supplied by low cost buck converter.
