![]() ![]() DIN 7154, H7 Metric Bore and DIN 6885,Js9 Square Keyway Tolerances.AGMA 9002 - A86 Inch Bore and ANSI B17.1 Square Keyway Tolerances.Standard Timing Belt Pulley Face Width Tolerances.Standard Timing Belt Pulley Face Width Tolerances Standard Timing Belt Pulley Length of Bore Tolerances. ![]() Standard Timing Belt Pulley Length of Bore Tolerances Standard Timing Belt Pulley Tolerances (General).Standard Timing Belt Pulley Tolerances (General) The following charts and tables contain the standard tolerances used by Pfeifer Industries to aid in the design, manufacturing and inspection of the timing belt pulleys that Pfeifer Industries produces. A different timing belt tooth profile overlay is necessary for each number of toothed pulleys. These overlays are often proprietary information of the timing belt companies and are only given to licensed manufacturers such as Pfeifer Industries. The timing belt tooth profile must conform to an overlay provided by the timing belt manufacturer for a given number of timing pulley teeth. The inspection process of the timing belt tooth profile (groove) is made on an optical comparator. Pfeifer Industries employs gear hobbing to reproduce the timing belt tooth profiles. In order to manufacture a quality timing belt pulley, the correct timing belt tooth profile needs to be duplicated. Whenever possible, Pfeifer Industries adheres to those quality control standards which are more stringent. ISO 5294:1989 Synchronous belt drives - pulleys.ISO 13050:1999 Curvilinear toothed synchronous belt drive systems.ISO 5288:2001 Synchronous belt drives – vocabulary.International Organization for Standardization (ISO).IP-27 Curvilinear Toothed Synchronous Belts (H3M, R3M, S3M, H5M, S5M, H8M, R8M, S8M, H14M, R14M, S14M, H20M, AND R20M Belt Pitches.IP-24 Synchronous Belts (MXL, XL, L, H, XH, and XXH Belt Sections).Mechanical Power Transmission Association (MPTA).Pfeifer Industries follows the manufacturing quality control standards for timing belt pulleys dictated by the leading timing belt manufacturers:Īnd the standards of the following timing belt/timing belt pulley related associations. The overall performance and longevity of the timing belt is directly related to the accuracy of the timing belt pulleys’ manufacturing. In order to be made correctly, close tolerances have to be maintained throughout production. Both a gear and a timing belt pulley go through many of the same manufacturing steps to be produced. The manufacturing of a timing belt pulley is no different. ![]() ![]() Most people would agree that a gear is a precise, quality demanding CNC machined part that requires a certain degree of skill to manufacture. Pfeifer Industries’ timing belt pulleys are precisely made to exacting tolerances ensuring that the timing belt and timing belt pulleys perform as intended.
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