I assume you are talking about just CNC part programming?
If you already have a feel for G code programming, It pays not to rely entirely on CAD programs but to be able to compose the fundamentals at least by hand, also the next step would be to learn macro programming which makes G code that much more powerfull.
I believe there are some web sites where Macro instruction can be had.
If you want to practice and test results, free simulators like MicroTech Simulator are usefull.
Al.


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