This is a good analogy from my perspective. Bill was really arguing that Thomas was the initiator and pioneer of using 4 axis CNC to create what he called 4th axis work, and I was arguing that 4-axis and 5-axis machining has been around for longer and is common , and that -using 4-axes ought to be okay to call it 4-axis machining. Bill then asked me how long I"ve been making 4-axis cues or something like that!!!! We weren't talking the same language nor from aligned points of view.Part of what I took from their conversation is that different industries may recognize terminology a little differently, what Fred and Bill call 4 axis machining may slightly vary.
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I honestly don't know if Bill knew anything about 4-axis machining beyond cues. Maybe he did, but it didn't seem like he did, given his question. It's pretty common in my industry, so it didn't hurt me one iota if some other cue builder was saying he was doing 4-axis work. But I'm not Bill or Thomas. I get why they would be upset. Thomas is the pioneer, innovator, invento, etc. of what he calls 4th axis, which has specific implications to the cue making world and little to do with the 4-axis machining world outside of cues.