The above methods by Widgit and Geoff are good to use. I usually will clamp outside the contour if possible then cut through the profile all around except in two or three stratigically placed areas where I will leave a very thin tab to hold the part to the stock. After the profile is complete, pop it out of the skeleton either with a mallet or a pair if snips (or a chisel, or?) and the small tabs left on the part are removed with a beltsander, file, snips - whatever. Adjust the size and thickness of the tabs to suit your needs. I usually leave around 3MM wide tabs that are maybe .15mm thick for aluminum parts - for steel you will have to be a bit thicker and maybe slightly larger. I position them in an area that is easy to get to with the beltsander - like on an outside corner. The position of the tabs is dependent on the shape of the part, your starting point and your tool path but their placement is fairly intuitive.
Scott
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