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Steel-backed Cast-iron Brake Drums

17th April 1936, Page 51
17th April 1936
Page 51
Page 51, 17th April 1936 — Steel-backed Cast-iron Brake Drums
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r-IF the two materials commonly used %a/for the manufacture of brake drums —steel and cast-iron—both have disadvantages and advantages. The former metal is lighter, has greater tensile strength and can be pressed to the required shape, whilst the latter has better wearing properties, higher heat conductivity, no tendency to grooving or squeaking, and can be cast to form cooling flanges.

In the Centrit brake drum, a new product of the Sheepbridge Stokes Centrifugal Castings Co., Ltd., Sheepbridge Works, Chesterfield, a. happy combination of the two is comprised. The back is a steel pressing which includes a lipped rim of substantial depth. Extending from within this rim to the desired maximum width is the centrifugally cast iron flange. The method of construction permits the back to be lighter than would be the case in a drum formed entirely in pressed steel, whilst the flange possesses greater rigidity and heat-dissipating properties, not only intrinsically, but also by reason of the ribs which can easily be formed on its periphery. Moreover, the latter characteristic minimizes the loss , of efficiency caused by excessive expansion due to 'temperature rises, It is claimed that the union between the iron and steel is made by welding, which takes place during the casting operation, but, to afford additional strength to resist heavy torsional stresses, the edge of the back is slotted,' so that a dovetailed joint is formed between the two metals, and a positive drive provided.

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