As you know, model airplanes and much hard work the most boring work is making ribs. Most often they are cut from plywood or veneer with a fret-saw or sharp knife, and then push the workpiece through the skins. Meanwhile, this is not too interesting and hard work it is possible to rationalize. Just need to make some simple devices that will dramatically reduce time costs.
The most productive operation in the industry is considered cutting. Punches can be used in the modeling. You need to do first to make the master rib is preferably made of aluminum. Then on a lathe is cut out of carbon steel ring — the length of its inner circle should be the same as the perimeter of the arch profile of the reference rib. To accurately determine this value, you need to take a strip of masking tape Scotch tape and stick it around the perimeter of the rib. The ends of the strips are trimmed so that they fit without a gap and overlap, after which the strip takes place and it is measured a ring.
Its working edge is sharpened, the workpiece is accurately bent in accordance with the form of the reference rib and quenched. Felling is best done in a conventional bench vise, as shown in the figure.