Keyseat cutter from Harvey Tools on the SO3

I was running this one in aluminum: https://www.harveytool.com/products/tool-details-970395

My machine is a Shapeoko 3 standard with HDZ. I ran it at 15,000rpm, 48ipm/0.0008ipt, with a 0.016in stepover for the roughing passes and a .005in stepover for the finishing pass.

I had issues with it pushing away from the part, the first one I made was out of spec and didn’t cut the slot deep enough. I ended up forcing it into the cut with my hand guiding the router. Not the greatest solution, but it worked well enough.