Pencil Toolpaths

Notice in Figure 9.8 that Scallop tool paths may also leave areas that require further finishing, though not as much as, say, a Parallel path.

Pencil Trace tool paths are a type of remaining stock machining (Rest Milling) that works by tracing a tool along the seams between surfaces that form an inside angle. Figure 9.10 shows a pencil tool path between along the inside fillet. This clears any remaining scallops in this area, leaving a perfect seam.

Like with REST machining, use a tool smaller than the radius when possible for Pencil tool paths.

Figure 9.10: Pencil Trace Tool Path