Hi Mike,
I am not sure if I am visualizing it correctly as I have no perspective view and not sure about dimension or depth requirements.
Is the part not symetrical? The lip does not extend to the right the same as the left side. Will the ribs go up the sides only or will they go accross the part also? How thick will the lip be? Do you want a fillet in the corner where the lips meet the side?
I think if you can use a flat end mill to do the milling down towards the top of the lip for the full width of the confour and then step over and leave enough material to machine a fillet radius with a ball nose. Then change to a ball nose and finish the fillet with that just for the toolpath along the profile where the lip meets the side. It may take 3 different toolpaths to complete and can either be done with a toolchange in the program or several different programs.
If no fillet is needed then you can mill it like you mentioned down and leave enough material to machine between the ribs etc. and have the ribs say 1/16 high. Probably 2 toolpaths could do it.
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Regards,
Wes |