How to Write Roughing Cycles on a CNC Lathe Using G71

As we continue in this CNC lathe programming series, this time Marc from G Code Tutor shows us how he writes roughing cycles using G71. If we plan on using the same profile for more than one sequence, we can utilize a subroutine and recall it later to save time from writing the same code over and over. Marc demonstrates this by creating a subroutine for the roughing operation that we can later recall when programming the finishing cycle. When we program the taper on this part, there is a dimension that the drawing does not state. Marc shows us how we can calculate points to plot with G-Code using trigonometry to fully solve the drawing so we can write our program.