Help needed for a 3d part gcode for mach3

[magicniner]

Getting back to the OP's original request and stepping away from the Tangents this topic has spawned I've had a fiddle in BobCad Cam V25 Build 996
Before posting code I'll wait for preferred tooling size, advance per flute and spindle speed from the OP, but here's how you could get there -

1. import and reposition (translate) the model
2. Create a new layer and select it as active, then used Extract Edges From Solid to create a wireframe in the new layer, which can then be viewed satndalone by turning off the original layer (with the model in it).
3. Use Profile for the flat edge, select the line where the flat meets the vertical for geometry.
4. Use Profile to take the curved edge down to the upper vertex of the curved suface where it meets the vertical, select the line where the curved surface meets the vertical for geometry.
5 Use Pocket with outside edge lines set as dotted lines (allows the tool to pass the edge of the work) to make the operation Open Pocket for the two middle slots.

Now you're into the curved surface, you'll probably use a function requiring a Boundary and selection of the surface in the solid model layer to be selected as the geometry.

To make your boundary create another new layer, set it as active and use CAD Line drawing based on Extracted Edges to construct a Boundary for the operation, usually 1/2 the tool diameter smaller than the surface to machine.

When you Compute paths you'll get something like this -



CAM is a lot more in depth than I ever imagined before diving into CNC, I've missed out all the detail of selecting tooling options, top & bottom of work where required and multiple other options within the functions, hopefully the above shows why it's rarely the case that a request for G-Code from a solid model is met. There can be quite a lot of work for what looks like a simple job and it's rarely simply a case of feeding a model to the software and getting G-Code out,
Best Regards,
Nick