I'm going to curve the back section to get rid of the right angled edge. I've written this g-code routine already for the top watch section so I'll use it again. Strictly speaking the back section is not supposed to be an ellipse shape, but if I tweak the parameters then it becomes a very shallow ellipse and will be fine for this initial design.
As before the g-code routine is depicted in the diagram, above, showing the tool paths. The programme itself is the same as before, only with different parameter values.
I run the routine and, as before, stand alert and ready to intervene in-case the routine goes astray
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After running the routine, and polishing, the ring looks like this
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Then I cut the back section to fit inside the middle section
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As before, I cut a gasket groove into the edge to give a water resistant seal
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The next thing I did was to add some curvature to the lugs. I put the middle watch section into the vice,
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and filing some curvature into the lugs
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I'm trying to be consistent with both set of lugs, I think this is something that will improve with practice. It's really a case of doing it by eye and making them look right. After my initial work on the lugs they look like this:
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which fine for now. Once they're polished I'll take a fine look at them an make sure they are all consistent and perhaps do some more adjustments.