Without the 75mm by 50mm by 1/4 inch 6061 alloy angle brackets you could flex the steel in the middle. Now, well... it is not so easy for a human to apply enough force to do it. The thread plate is only supported by 4 colonnades at the left and right side. The middle is unsupported to allow the gantry to travel 950mm along. I think the next build will be more a vertical mill style than sliding gantry to avoid these rigidity challenges.
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How much new language came into being during that time... flanging, laminating, snipping a bit off the corner (just snip it off no problems), and how many unforeseen things happen despite the best of plans, like aiming the cameras, being able to reach up and into the enclosure, inventing the swingarm and stress relief for the spindle water cooling tubes. That's some good work.
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