Using the rotary axis as Z for depth etching on a galvo?

Is it possible to use the stepper output from the rotary stepper to control the Z depth passes on a galvo setup?

Thankyou for your time.

Possible with the probability of success pretty small.
If I understand your question correctly you want to lower the laser the amount of material removed so laser stays in focus? Or is it for 3D engraving? Just curious.

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