wanted was a brake to bend small brackets. The drawing could be enlarged to most any scale to suit the individual needs. The basic form could be lengthened ...
AC Spark Plug's . . . "Tip Of The Month Contest" By Grover A. Chaplin, EAA 5507 4748 W. 162nd St., Lawndale, Calif.
OR A LONG time I have read with interest various F the boys have described their ways of bending sheet metal
articles in SPORT AVIATION on the different ways
parts. As I work with sheet metal in the aircraft industry I got to thinking how much simpler it would be if a small sheet metal brake was designed that could be cheaply and easily built and eliminate form blocks, hammering on
material, heating to bend, etc. The brake I have designed is rather small in its present form, but this was a matter of choice as all I wanted was a brake to bend small brackets. The drawing could be enlarged to most any scale to suit the individual needs. The basic form could be lengthened or widened to suit. The brake in its present form will bend .062 chrome moly with a Vs in. radius with a nice clean brake and will form "U" brackets with an inside dimension of 9/16 in., l/z in. with a little forming on the second flange.
The simplest method I have found on a "U" bracket is to bend the first flange and then use a spacer from the inside edge of the bent up flange to the hold down shoe to set your dimension. This spacer should be the size you want the inside dimension to be. The only other point I would like to bring up is that the center of the hinge pin most be on the exact center of the bottom plate in both planes; failure to do so will result in either a very sloppy bend or a brake that will not bend a full 90 deg. bend as it will jam if it is too low. The brake now will bend up to 5 in. long pieces. Rather than design a complex hold-down for the shoe, I have found that the simplest way to get the pressure is to clamp the brake in the vise. One more thing to bring to mind, if the brake is to be lengthened I would advise that the metal thickness be increased in proportion to the increase in length.
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These parts were made with the brake. SPORT AVIATION
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