[remipch]

> Taking a computer out of the loop is the best way to guarantee speed and reliability.

As suggested by pjc50 in another comment [0], a passive safety would be good for this application.

The main drawback being the space required to protect the entire danger zone.

> Bon travail et bonne chance!

Merci beaucoup

[0] https://news.ycombinator.com/item?id=41390704

[contingencies]

Well short of an enclosure, the standard for power tools is to project some form of laser mark. Only when the operator verifies the mark is in the correct position should they activate the system. This would be a viable approach for a CNC-shaped array of curves and would not require a complete enclosure, which has various downsides (windage, size, weight, potential for damage, suitability for rough terrain, etc.)