Is there a way to draw a part, then use cam on it and remove material for each setup or do you need to draw the part in stages?
One way to do this is with configurations.
First config is with first machining step.
Second and furthermore with continuing machining steps as needed.
I'll say you model the part in stages or as finished.
CAM use the model to program.
I wish I can sent programming a blank and they can give me a finish program.
I don't know about SW CAM but many CAM programs allow you to output the "Machined" part as an STL or some other format. You then use that STL as the "Material" for the next operation.
So you place the part in the file, create your stock and cut your first operation. You then use the "Cut material" as the material for the next operation and so on. You never use the part model for anything other than CAM paths.
I just looked at SW cam and it has a stock manager and it does have STL as well as part. I have no idea whether not SW CAM allows you to export the "Machined Part" as an STL or part though.
I would say make the part with a few of features as possible. Any cam software should be able to help you work down to that part from a starting material.
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