If you are machining one of those triangular shaped pockets through the sprocket it will take longer to do it than it will to machine to a depth. Looking at the machining pattern inside each of the recesses they are using a small cutter and taking small cuts at a high speed and feed, to go right through would take a different approach where you would need to leave a membrane that would need snapped out and then deburred.
eddie_lejeune's post in Jitsie Sprockets Rip Off? was marked as the answer