The ideal way to cut the “F” holes in a carved top is to use
a pin router which, of course, I don’t have. So, let’s make one! I’ve had a drill-stand knocking about for years which was made redundant when I got a pillar
drill, so I that’s a good start.
I wanted to mount my Dremel in the drill stand and fortunately
found a chap in Germany who makes just the thing- an adaptor for CNC routers with a 43mm outer diameter and the
correct thread for taking the Dremel.
This is a brief explanation of the process, as in reality it
took many hours of thought, design and plain old trial and error to get
a perfectly clean cut hole.
Eventually, I arrived at this final set-up.
You’ll see that
the cutter is aligned with a pin. This pin is a guide for a template which has
the exact shape that’s required cut out. The soundboard is mounted on the
template and the sound holes cut out.
And here we have the finished soundholes, as you'll see, not quiet "F"holes. Note that the holes are bound with black veneer; not easy to do!
Labels: Nava Archtop Mandolin