In My Shop

In this video I make a mate to the Concave piece I turned, but designed such that the cut surfaces are only parallel when they are separated by 0.030 inches. With this, a 30-thou thick piece of sheet metal can be evenly pressed on both sides. Some math to help is given at the end,

Using the Curve approximation features in my DRO to cut a concave surface on my manual lathe. Some setup and math are in here, as well as chips being made.

Parametric CNC programs are written in Gcode and use variables to set things like line length or circle radius, and calculate cuts based on those input values. This allows work to be moved or scaled by changing a value in the program instead of reworking all the moves, or remaking the program in Fusion or another CAM program.