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Centerline alignment issue for flange holes in arc-shaped plates

2018-01-18View Original

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The CAD drawings and actual plasma cutting images are as follows: The radius of the two edge lines of the flange is R5590, while the radii of the center line are R5650 and R5540. Why is this? My understanding is that the two outer lines and the two center lines should all be positioned around the same center. Since the radius of the outer lines is R5590, the radii of the other three lines should decrease sequentially; then why is the radius value for the inner center line R5650? I have no idea at all about this problem; I really don’t know why it is the case, nor do I know what knowledge I’m lacking. I hope the expert can offer some guidance. Thank you!

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