Contributor Mark Grizotsky has developed another timely insight: “When tool-designers develop roughing hobs for milling roughing straight-side spline shifts, they must remember this about the wear of ...

Figure 1 shows a spline shaft and teeth together. The teeth of a hob form a trapezia with two lines from sides under angle @. See Figure 1, which shows a spline shaft and teeth, pictured together. If ...

Quick, what’s 360 divided by 23? It’s easy enough to get the answer, of course, but if you need to machine a feature every 15.652 degrees around a shaft, how exactly would you accomplish that? There ...