Machinery's Handbook, 31st Edition
2350 Involute Splines d) To supplement inspection by gages where each individual variation must be restrained from assuming too great a portion of the tolerance between the minimum material actual and the maximum material effective dimensions. Inspection with Gages.— A variety of gages is used in the inspection of involute splines. Types of Gages: A composite spline gage has a full complement of teeth. A sector spline gage has two diametrically opposite groups of teeth. A sector plug gage with only two teeth per sector is also known as a “paddle gage.” A sector ring gage with only two teeth per sector is also known as a “snap ring gage.” A progressive gage is a gage consisting of two or more adjacent sections with different inspection functions. Progressive GO gages are physical combinations of GO gage members that check consecutively first one feature or one group of features, then their relationship to other features. GO and NOT GO gages may also be combined physically to form a progressive gage.
Max Actual Circular Space Width
Max Effective Circular Tooth Thickness
Not Go Sector Plug Gage or Measurement between Pins Not Go Composite Plug Gage Go Composite Plug Gage Reference Dimension (Measurement between Pins)
Not Go Sector Ring Gage or Measurement over Pins Not Go Composite Ring Gage Go Composite Ring Gage Reference Dimension (Measurement over Pins)
Max Effective Min Actual Min Effective
Max Actual Min Effective Min Actual
Pitch Circle
Pitch Circle
Internal
External
Fig. 5. Space Width and Tooth-Thickness Inspection GO and NOT GO Gages: GO gages are used to inspect maximum material conditions (maximum external, minimum internal dimensions). They may be used to inspect an indi vidual dimension or the relationship between two or more functional dimensions. They control the minimum looseness or maximum interference. NOT GO gages are used to inspect minimum material conditions (minimum external, maximum internal dimensions), thereby controlling the maximum looseness or minimum interference. Unless otherwise agreed upon, a product is acceptable only if the NOT GO gage does not enter or go on the part. A NOT GO gage can be used to inspect only one dimension. An attempt at simultaneous NOT GO inspection of more than one dimension could result in failure of such a gage to enter or go on (acceptance of part), even though all but one of the dimensions were outside product limits. In the event all dimensions are out side the limits, their relationship could be such as to allow acceptance. Effective and Actual Dimensions: The effective space width and tooth thickness are inspected by means of an accurate mating member in the form of a composite spline gage. The actual space width and tooth thickness are inspected with sector plug and ring gages, or by measurements with pins. Measurements with Pins.— The actual space width of internal splines, and the actual tooth thickness of external splines, may be measured with pins. These measurements do not determine the fit between mating parts, but may be used as part of the analytic inspection of splines to evaluate the effective space width or effective tooth thickness by approximation. Formulas for 2-Pin Measurement Between Pins: For measurement between pins of internal splines using the symbols given on page 2335 : 1) Find involute of pressure angle at pin center: D s D d inv inv i d b i φ φ = + −
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