When your on the path, one must know how far they have come and how far they have to go.. And so it is with machining. From blue prints to planing the job, you have to have the means for establishing how much you have cut and how much more you have to cut..
Military Manuals Army Machinist Course -1988- Part Six of Seven- Measuring Instruments 2015-05-17
The Army course on Machining and machine metal work. Part Six of Seven, Measuring Instruments