The G71 Roughing cycle on a CNC lathe explained!

I write a program for a CNC Lathe using a G71 roughing cycle with a subroutine using G Code.
This is one lesson from a 2-hour course available at gcodetutor.com
Look over my shoulder as I write the program and explain everything I do to machine a profile on a Lathe.
Each part of the roughing cycle explained,
How to use subroutines to speed up the process,
best working practices.
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