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By W. R. Macconnell (Eds.)

ISBN-10: 0080157580

ISBN-13: 9780080157580

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G. plane discs, curved discs, re­ volving drums). g. g. lathe beds, spindle boxes). 5 44 No Yes Designation Non-rotational components Components that do not fulfil the conditions for rotational components with deviations come under non-rotational components. A rectangular prism is a better envelope for these components than a cylinder. Flat components Flat components have as an envelope a rectangular prism of dimensions such that the ratios of the three edges are: A ^ ~ A ~B " 6> ~C 45 Compo­ nent Class No Designation Yes Principal shape The principal shape describes the rough shape of the machined component.

Designation Plane, rectangular with circular Coding digit deviations Components with deviations from the rectangular shape in the form of an arc of a circle Plane, any flat shape other than positions 0 to 3 This includes plane plates of any flat shape that cannot be assigned to positions 0 to 3 Flat component, rectangular or right-angled small deviations due to casting, welding or forming with Plates whose shape is basically rectangular or right-angled, with deviations such as ribs, eyes, hinges, etc.

The function of the principal bore may be as a centre, for positioning, as a bearing guide, etc. Rotational surface machining Rotational surfaces on non-rotational components, produced by turning or boring (eg. principal bores, annular grooves) are comprised under this heading. Auxiliary holes are not coded under this heading. See coding digit 5. 50 No Pos. Yes Designation No rotational machining or bore(s) Components having no principal bore and no rota­ tional surface machining. One principal bore, smooth One bore of uniform diameter throughout its length.

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