I’m trying to make an outdoor sign. The outside circle about 1" should stay at the top. The anchor and letters also. I want to pocket the rest of the inside down to maybe half the thickness. I’m having difficulty with that part.
0.5" of thickness is quite a bit to remove, and isn’t really necessary for a sign which will be well illuminated.
The design has quite a few intricate details which would require a very small tool, which would be almost impossibly delicate at a length suited to cutting to this depth.
On option would be to simple do an Advanced V carving — this is quite straight-forward and easily done and achieves a good representation of the detail — this isn’t quite able to reach the requested depth unless one purchases a large tool such as the Amana RC-1148 in:
Using that we select all but the outermost circle:
Cutting out the circle will want a tool which has a cutting flute length of 1" or greater (usually sold as a “long reach” endmill), and for one to add offset geometry at the endmill diameter plus 10% or so:
One would then offset the outside geometry as noted above and assign toolpaths as noted at:
assuming of course, that one can source ball-nosed tooling suited to making this cut — cutting this using square tooling has similar difficulties — it’s just much, much easier to cut as a V carving and be done with it.