Lately I encountered two projects where I needed rounded forms. And then, I got grounded. Where in woodworking flat, straight and square has numerous problems and solutions, round has its own needs.
James Krenov's coopered doors.
Flattening (rounding) the exterior can be done with any plane. The interior is another problem. Krenov says he uses a number of rounded planes of his own made. If I have round profile planes, I have nothing close to a number 300 needed to do the job. I looked to Robert Wearing for an alternative and in his tool list I found:
- A firmer gouge, it has the rounding similar to a normal round profile plane, there is no gain here if both are available.
- Half round rasps and files, presented in his book without handle. With some creativity about handles set on the flat side, this could be a solution.
- Abrasive papers. Most probably this is closest to a solution, it is easy to make rounded form and fix sandpaper on it.
My starting idea was to follow the Krenov approach with dedicated round planes. I could take a cheap wooden plane and round it and sharpen the blade with an appropriate curve. Or as an alternative take my cheapest n°3 plane, glue a strip of hardwood on the sole and round it as well as the blade.
All this written, I think I drop the n°3 modification and give sandpaper a try. For me the Krenov project is already innovative, adding plane making to it doubles the load.
Looking at my other gRounded project is for another time. It's making a sector based on a description of Jim Tolpin in Measure twice, cut once. I thought I had 'improved' his design, and created some new problems in the process.