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`5600,0.,
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`Kerr
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`Page 1 of 3
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`Page 2 of 3
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`28 UNIT
`Machining Processes II
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`NECKS AND IlNDERCIl'I'S
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`Necking, or undercutting or grooving a it is sometimes called, is the process of cutting a recess in a diameter. Node
`are often cut at the ends of threads or where a shaft changes diameter. The neck undercuts the shaft so that a mat-
`ing part will seat against the shoulder.
`Necks are usually dimensioned with a leader and a note. The width and depth of the recess is provided, Figure
`28.1. Another common practice is to call out the neck width and the diameter of the shaft at the bottom of the neck,
`Figure 28.2.
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`Kuununc
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`Knurling is the process of imprssing a straight or diamond-shaped pattern into a cylindriml piece using special
`knurling tools. The knurl is formed by forcing the hardened knurling rollers on the knurling tool into the surface
`of a revolving cylindrical part. The pressure of the knurling tool creates a pattern of straight or diamond groom as
`material is forced outward against the knurling rollers, Figure 28.3.
`In addition to creating a pattern on the surface of the cylindriml workpiece, the displacement of metal during
`the knurling process tends to increase the diameter of the knurled part.
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`NECK .06 WIDE .03 DEEP
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`
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`FIGURE 28.l l Dimensioning a neck by width and depth
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`NECK .12 WIDE x 0 .38
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`FIGURE 28.2 I Dimensioning a neck by width and diameter
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`Page 3 0f 3
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`Page 3 of 3
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