Hello everybody,
I own a chinese Mini CNC engraver 3040 and I want to enter the grave granite engraving business. (I emphasis on Granite not marble, Granite is way harder than marble)
Actually the spindle is about 300w, I know that with this amount of power engraving on a granite is not possible.
My questions are:
in case I go for an upgrade; changing the spindle with a more powerful one + using a diamong bit, would it be possible to do the job?
If yes how much power is needed and what bit do you suggest?

I hope to get an answer as soon as possible.