Simple flat pattern generator for truncated cones

As I get to cut out lots of sheetmetal truncated cone patterns I have used this method to produce pattern for many years. You can produce these patterns using sheetmetal lofts with most 3D modeling products but this way can be done with calculator 2D cad and is quick. Also produces patterns made from arcs and not short line segments as often the case with lofts. Plasma cutting machines moving heavy torches fast on thin sheets are better off as with short lines is constantly trying to start accelerate then slow down on each line segment. Just open up the function & variable table and alter values to suit