Boss end operations

Fnaaaar. Nothing to do with the old todger. The bottom side is complete, so now to focus on the side that interfaces with the quill.

There's a (horizontal) cylindrical boss that mates with a locating counterbore on the quill and a (vertical) cylindrical face that sits against the external face of said quill. Then there is a rectangular section that reaches through the long slot in the head casting and connects the main yoke / bracket body to the quill. I need to finish off those features which are currently only roughed out.

1. Drill pilot hole 7mm through centre of boss.
2. Drill 9.5mm using 3/8" carbide end mill (don't have a drill that size that's fit to use).
3. 2D Circular with 3mm (actually 1/8") ball end mill to form the clearance channel around the boss. Had to change the channel in the CAD model from circular section to square to fit the toolpath.
4. 2D Contour to machine the 2 steps and fillet radii. I've got round to adding the fillets on the top end of the rectangular island (see below).

These are the 4 paths, ready to go:

Now need to set up the 3 tools:

• Tool 5: 1/8" ball end mill in ER16 collet chuck, 60mm gauge length.
• Tool 13: 3/8" carbide end mill in ER40 collet chuck, 70mm gauge length
• Tool 14: 7mm HSSCo drill in ER16 collet chuck, 60mm gauge length

Got them set up in the Acorn tool library:

Now, set up tool length offsets....