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There are several versions of the CNC shark that have been developed over the years. You need to look at your controller and see if it has an output for the spindle to turn it on and off. https://3d-model-shop.com/product/3d-stl-model-1205-3d-cnc-files-stl-models-for-cnc-router - Many of the newer models like the MAKO have this feature. If you do, then you are in luck! The spindle control uses a relay to switch the power on and off to the spindle. This relay is controlled by a DC voltage signal. This is the signal we need to turn on and off the laser..