It all comes down to what you want to do and how serious you are about this as a career. Sure, it'd be great to have a Bridgeport to play around with. But classes and that apprenticeship are the way to go. Learning basic machine shop practices from a teacher or mentor will keep you from picking up lots of bad habits. You have to know the basic X, Y and Z axis moves to do anything. But you can learn how to move an axis to drill a .250" hole at X +2.500" and Y +1.125" in about 10 minutes. But you have to know speeds & feeds: aluminum will machine differently than cold roll steel. Cold roll will machine differently than S7. S7 <- D2. D2 <- titanium, etc., etc. And climb milling will give you a different finish than conventional milling. So practicing with plastic (regular end mills don't like wood) is possible, but only if you're going to be machining plastic in the future. You can get scraps of steel from machine shops in your area for nothing. An entire bar of cold roll isn't that expensive.
But once you learn how to build jigs, you certainly can do a lot of the same things that can be done on a CNC mill. A CNC just allows one person to be working on something else while the machine runs... which is why even small shops have CNC knee mills these days. Here's a guy who converted an old Bridgeport to run G-code programs:
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I'd had my MBA for years. But my *** was prouder of me when I went back and got an associates in Machine Technology several years ago. I found out I had enough credits for the degree because I'd taken so many classes just for shits & giggles. They'd only let me play with the machines and robots if I signed up for classes. It was like geek/gearhead porn... I loved it. My company even paid for the cost. What a bargain! :nanner: I want to go back and take Latin somewhere now. But I doubt I can con my new employer into paying for that. To me, it's all in fun. But for a career, I'd want to be a master with a lathe (the most basic piece of shop equipment) and a mill. And take all the math you can take. CAD/CAM programs will do the heavy lifting for you. If you don't have access to that though, you'll have to trig things out on your own.