Check me out … I am the noob rolling with Fusion 360 and trying to cut some fret slots for a guitar. I have had a good model of the fretboard for weeks but struggled a lot with CAD and CAM interaction. Much of my consternation was related to the geometry of the fret slots in the model and Fusions apparent refusal to cut a .023" slot with a .023" tool.
Last night I finally executed the proper process to project a line onto a curved surface without it being an extrusion. I used the trace action in the CAM to program the cutting of the slots. Each line being projected is measured from the nut (end of the fret board), so I would not suspect some sort of cumulative error as I go up the neck but only the 4th fret slot appears to be dead on. The first 3 are a little short and 5-20 are all a little long.
Anybody else have trouble with cutting that requires precision down to thousandths of an inch? Anything I need to calibrate on the Longmill? The X axis is most suspect in this process.
On a positive note, my inlay testing went flawlessly.