need to flip a piece of work
If you’re looking for advice on 2 side machining I would advise the following.
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design in locator holes. These go all the way through your stock and match up with holes in your waste board. You can then line things up with a dowel or golf tee. When you flip the work the holes again line up as you machine the other side of the project.
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be careful how you flip the work piece. Some designs are designed to flip top to bottom, others left to right. Be sure you flip the right way.
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with two sided machining, the stock thickness is critical. It must match what the design software is set to use.
When I do two sided machining, I use Vectric V-Carve desktop. I start with an .STL file (the type used by 3D printers) and then I make Vectric create the tool paths. I often 3D print the design first to make sure that the .STL file makes what I want.
I’d make my part with a centerline down the middle and set up some fences on either sides and the ends to contain it. I’d make my X0 and Y0 on one end of the centerline.