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HARTNESs SCREW THREAD COMPARATOR
Figure 18 shows the form of cradles usually preferred for
bolt work. The thread of the bolt rests in one of the cradles and
the shank in the other.
The thread form of the cradles is cleared at crest and root SO
that it takes bearing on the sides of the thread of the screw, SO
that it locates the screw in relation to the flanks of the thread which
after all are the only essential working parts.
32
Document source description
This is a publication about a comparator machine for the inspection of screw threads, with illustrations by Russell W. Porter.
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"ocrText": "HARTNESs SCREW THREAD COMPARATOR\nFigure 18 shows the form of cradles usually preferred for\nbolt work. The thread of the bolt rests in one of the cradles and\nthe shank in the other.\nThe thread form of the cradles is cleared at crest and root SO\nthat it takes bearing on the sides of the thread of the screw, SO\nthat it locates the screw in relation to the flanks of the thread which\nafter all are the only essential working parts.\n32"
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