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Updated: May 29, 2025
All of these experiments were made to enable us to answer correctly the two questions which face every machinist each time that he does a piece of work in a metal-cutting machine, such as a lathe, planer, drill press, or miring machine. These two questions are: In order to do the work in the quickest time, At what cutting speed shall I run my machine? and What feed shall I use?
It would give them courage. They could be more resolute. Linda Beach went back to camera-position and waited until the demonstration of the pocket metal-cutting device, by Fran, was ended. Then she signalled for her own camera and definitely put on the charm. She showed the necklace. She said it had been stolen.
By means of four quite elaborate slide-rules, which have been especially made for the purpose of determining the all-round capacity of metal-cutting machines, a careful analysis was made of every element of this machine in its relation to the work in hand.
In considering this typical case, it must also be remembered that the metal-cutting machines throughout our machine-shops have practically all been speeded by their makers by guesswork, and without the knowledge obtained through a study of the art of cutting metals.
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