Currently doing a milling job into 27mm thick birch wood. Milling bit caught on a hard inclusion, workpiece dislocated, bit got stuck - Snapmaker immediately stopped the job, no real damage done except for the workpiece lost.
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Nice save! Was it the 200w module? Is there any built in safeguard that stops it rotating if it gets stuck?
The 200W toolhead and milling job stops if the tool gets blocked.
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Yes, it was the 200W. The rotational speed is constantly monitored it seems - you can see on the touchscreen that RPM changes a bit over time, depending on the resistance the workpiece imposes to the milling bit. My assumption is that the firmware has a limit implemented, that if RPM is below X % of the target RPM, it assumes a failure and stops. Maybe indeed only if the spindle stops completely, just guessing here.
That said, Iād assume that the same safeguard applies with the 50W, but again I may be wrong.
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Iāve never pushed either the 50w or 200w CNC to their limits, but itās good to hear it has some sort of safety built in. Thanks @Hauke and @xchrisd!
My experience doesnāt fully support that. Created my GCode with FreeCad and forgot to set the RPM in the toolcontroller when adding a tool bit. As a result, the spindle (200W) was not spinning but the head moving into the material (z-direction) and then moving X/Y, which cracked my 1.0 mm FE Mill 
Certainly my fault but a rule: ānot spinning, not movingā would have saved my bit.
The rule may apply, if the spinning stops during operation as you describe.
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