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HARTNESS S CREW THREAD COMPARATOR
Fig. 16. Sketch shows bad lead error in a screw having the
smallest allowable pitch diameter. This screw would be barely
acceptable if it had a true lead.
The foregoing sketches have been used for illus-
tration because they are free from the surface irregu-
larity found in the photos of work.
It simplifies our approach to the problem if we
see the effect of the shifting of the shadow on the
tolerance chart under the effect of variation in diam-
eter and lead.
The reciprocal effect of lead and diameter is shown
at a glance.
28
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 S CREW THREAD COMPARATOR\nFig. 16. Sketch shows bad lead error in a screw having the\nsmallest allowable pitch diameter. This screw would be barely\nacceptable if it had a true lead.\nThe foregoing sketches have been used for illus-\ntration because they are free from the surface irregu-\nlarity found in the photos of work.\nIt simplifies our approach to the problem if we\nsee the effect of the shifting of the shadow on the\ntolerance chart under the effect of variation in diam-\neter and lead.\nThe reciprocal effect of lead and diameter is shown\nat a glance.\n28"
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