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A Guide to Ball Bearing Materials
they are an older technology, steel ball bearings are a trusted solution for many design engineers. Typically these types of bearings are comprised of all-steel parts, but are available with different types of steel races and balls, or with a phenolic cage. Steel ball bearings are ideal for robust
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More metal parts go to composites
reinforcement and matrix resin selection. Modulus values range from low 23,000 to ultrahigh 46,000 kpsi. The choice of matrix resin (polyimide, phenolic, or epoxy) is also a metric that lets designers tweak composite temperature and chemical resistance. Working temperatures for the various epoxy
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Lowering The Toll On The Highway To Space
money by using ablative cooling in which the silica-phenolic composite combustion chamber simply chars and burns away. This means the chamber must be replaced after each flight, but it eliminates hundreds of feet of meticulously welded tubing. At first, engines will cost $1.2 million apiece about
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Proper Use Of Plastic Gears (.pdf)
. 1.25. 8. Phenolic. (molded). 0.45. .007. ·7,000. 340,000. .29. 270. 3.75. 1.42. * These are average values for comparison purpose only. Source: Clifford E. Adams, Plastic Gearing, Marcel Dekker Inc., N.Y. 1986. Reference 1. Table 18-3 Physical Properties of DELRIN Acetal Resin and ZYTEL Nylon Resin
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Design of Plastic Gears (.pdf)
. Phenolic. (molded). 0.45. .007. ·7,000. 340,000. .29. 270. 3.75. 1.42. * These are average values for comparison purpose only. Source: Clifford E. Adams, Plastic Gearing, Marcel Dekker Inc., N.Y. 1986. Reference 1. Table 18-3 Physical Properties of DELRIN Acetal Resin and ZYTEL Nylon Resin