Hello, I'm new here and just a novice with understanding of the basics. I have 8 u-joint cups that I need to machine on my lathe, to fit my lawn tractor. In the attached picture, the blue arrow is showing a groove that I need to widen 0.040" to fit my driveshaft yoke. The material is quite hard, but my carbide cutter does seem to cut it when I tested one. I'm looking for any tips or feedback on how best to do this. So far, the only idea I came up with was to move the cutter in X to the depth of the existing groove. Then back out and slide Z slightly to make another X cut. I would repeat this process until 0.040" has been removed in Z.