dge, or aS many as rately grinding lathe and plan- of by the short cutting edges and the angle gage, which ing tools. It is not a universal there may be, are then ground in is necessary when hand grinding is resorted to. Then there is no fear of the two sides of a thread having the same way.… … tested with a protractor so as to simple and handy, but accu- be exactly 60 deg., the form of rate guide. the thread as seen in an axial It is a simple device, consist- section would be just over 60 deg. In most ‘cases the exactly as described would suffer from the defect that ing, as will he seen…
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