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CHAPTER XLI. WORKSHOP EXPERIENCE.
No human hand touched the switch that ran that door down!
Another principle to be noticed in connection with hammers and forging processes is that of the inertia of the piece operated upona matter of no little importance in the heavier kinds of work.
Drilling, more than any other operation in metal cutting, requires the sense of feeling, and is farther from such conditions as admit of power feeding. The speed at which a drill may cut without heating or breaking is dependent upon the manner in which it is ground and the nature of the material drilled, the working conditions may change at any moment as the drilling progresses; so that hand feed is most suitable. Drilling machines arranged with power feed for boring should have some means of permanently disengaging the feeding mechanism to prevent its use in ordinary drilling.
"If you please."