The weight and drag of the flexible drive shaft on standard model planers, as well as vibration and "bucking" if the shaft is bent at much of an angle, have annoyed users of this equipment. These drawbacks were previously overcome only by having an assistant hold up the flexible shaft to keep it relatively straight and weightless, immobilizing a nurse for as long as the planer was in use. Some new model planers incorporate a spring support holding up the shaft. A similar flexible spring support with 18-in. total projection is made to clamp on ironing boards to hold up the cord of a standard home electric hand iron. Thirty seconds' work with a pliers bends the end of one of these cord holders into a rough (about 1 in. diameter) circle to hold and guide the larger diameter flexible drive shaft of the planer. This is satisfactory, clamped
ZIMMERMAN MC. Spring Supports for the Drive Shaft of Planing Machines. AMA Arch Derm. 1959;79(3):354. doi:10.1001/archderm.1959.01560150096016
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