So sorry - my bad.Still can't see the image (need permission).
Maybe now? Google and I seem to be arguing.Still can't see the image (need permission).
I screwed the stock, at 4 corners, to some scrap plywood and attached that to my surfaced waste board. Since it was apparent the plywood wasn't flat, and all cuts were through, I just increased the depth to compensate. I left 0.5mm holding tabs at the cardinal points of each larger circle.View attachment 357856
looks like you've got it sorted.
It also looks like you milled down through the plywood?
What are you'd doing for work holding?
I screwed the stock, at 4 corners, to some scrap plywood and attached that to my surfaced waste board. Since it was apparent the plywood wasn't flat, and all cuts were through, I just increased the depth to compensate. I left 0.5mm holding tabs at the cardinal points of each larger circle.
Got it. The ring looks good. Are you doing the CAM in Fusion 360?
I have a pile of supplementary/sacrificial spoil boards like that -- with cut lines from going through the stock. I got one of these
https://www.whitesiderouterbits.com/collections/cnc-spoilboard-surfacing/products/6210
to face off the spoil boards. Still getting the occasional blow-through, but only when I screw up the z-height zero (or when the stock isn't flat).
I've had good success using a variation of this technique
for work holding with aluminum stock up to 6 mm thick (you can see the tape in post 19017). No tabs to cut and file.
EDIT: Just noticed that you wrote "my surfaced waste board" not "surface of my wasteboard" -- so you probably know all this stuff already.
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