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Originally Posted by sanddrag
Man, I don't even know what to say to that. I'm not saying I've never crashed a machine. But I know the one time I did, I never wanted to again. I was very embarrassed that I made such a careless mistake, and I was very concerned about the "health" of the machine. I usually try to learn by watching someone who knows what they are doing; not buy toying around with something I should have no business messing with. When you work at JPL, and you drive the Mars rover off the table by mistake because you weren't sure which button to press. They aren't going to say "oh well, at least he learned something" when you just cost them a few million dollars and multiple months of hard work. When you open up a computer monitor to repair it, and you accidentally grab a hold of the CRT, you might not even get to learn anything from that experience because you might be dead.
While making mistakes is a method of learning, it is certainly not the only method and I don't think it is a great method of learning.
If I had the luxury of owning a HAAS CNC, I'd take care of it like it was my child.
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The first time i crashed a CNC was in the 6th grade. Our team was showing me how to work a CNC at basic commands. The veteran mentor was right next to me and i scrolled the z axis down to much with out switching the nob to a smaller amount. I smashed right into the part. At that time i was really really scared i couldnt believe i did that and the members of the team were going crazy trying to look for another bit. It ended up ok when they found the tool. I proudly put the part on my desk and the part is still there right now. We treat our machines better than royalty but it doesnt mean we never screw up once in a while. And when we do after we make sure everything is ok we can just joke about it.