Enhancement Request: Don't start operation for a tool if it will hit soft limits

[R-Ronald]

I've run several jobs now where I've hit the soft limit for ZMIN during gcode execution. The tool is moving down (typically plunging or drilling), but soft limits for X stop it before it reaches the programmed height. So, the operation stops. Nothing wrong with this behavior.

However, it would be preferable if ioSender checked the operation was possible prior to starting it. Fusion 360 puts ZMIN values in its gcode header, so the gcode would not even need to be line-by-line parsed for a comparison against the results from the measured tool length (adjusted by the TLO and workspace zero).

IMHO, much better to find out you can't complete the cut before spinning up the spindle and starting it.

I removed the skateboard bearing on my PrintNC today and gained about 10mm more negative Z travel, so I plan to never again need this feature for myself. But, I think it would be useful for other people with limited ZMIN travel and short drill bits.