Every shop has it’s own strengths and weaknesses. Do what you do best and leave the rest is usually good advice. You may really want to learn something like horizontal milling, but does it make sense to sacrifice your limited time and energy?
It is surprising how much time you can waste pursuing pet projects that suck up your time and energy. I know a guy who was bent on having his EDM dept. set up to use pallets. He wasted thousands of dollars and a lot of time until he came to the realization that it is a great idea but just would never work in his case.
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