I’m part-way through the build of a Hemingway die filer kit, and I’m wondering about how to interpret the drawings and fixture the castings in order to machine some radial slots.

If I’m reading these right, the radii are measured from the “extended” dimension that I’ve ringed in red?

Then I’m wondering about the best way to fixture this for milling, because the larger of the two castings is too big to swing on my SC4.

I’ve got a rotary table, but it’s too small to easily clamp the castings down – so I was thinking of mounting the part to my lathe faceplate and bolting the faceplate to the rotary table.

The casting would have to be offset so that the “virtual” centre dimension is aligned with the rotary table centre, then the entire stack would need to be clamped to the mill table and offset so that the cutter would sweep the arc as the rotary table was turned.

Does this sound feasible (or advisable), or is there a more straightforward option I’ve overlooked?