I need to cut a .25" deep slot that is tapered down (1* per side) to .041" wide at the bottom.
Should I use a .040" mill with a tiny left for the finish pass, or a .031" using HSM toolpaths? My spindle only goes 5k rpm, so I know it won't be truly high speed, but I am more thinking of the shape of the toolpath, tool rigidity, and chip clearing.
Any other thoughts would be appreciated. I have not spent much time below 1/16", especially at this large depth:width ratio.
Thanks.