Grooving Coil Formers
ROOVING ribbed or skeleton coil formers makes it easier to place on spaced windings without risk of the turns slipping. If the grooves are cut with a saw, it is difficult to space them evenly. A good tool with which to perform this operation can be made easily with a small-toothed wheel taken from a clock or similar mechanism. The wheel is mounted in a holder, and is warmed before running it along the ebonite. If a fairly strong pressure is applied, the teeth will make evenlyspaced indentations, thus enabling the constructor to wind his coils with a minimum of difficulty. am
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291011.2.54
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Radio Record, Volume III, Issue 13, 11 October 1929, Page 25
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105Grooving Coil Formers Radio Record, Volume III, Issue 13, 11 October 1929, Page 25
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