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Web Thinning Methods

Usual method of thinning the point of a drill when the web has become too thick because of repeated re-pointing. Undercut Thinned Point - Another common method of web thinning. If properly done, this type of thinning will produce a fine curled chip.

Diameter of Drill, Inches 1/8 1/4 1/2 1 Over 1
Web-Thickness Expressed as a Percentage of Drill Diameter Variable 20 17 14 12 11
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