THREE:A set of lathe tools should consist of all that are required for every variety of work performed, so that no time will be lost by waiting to prepare tools after they are wanted. An ordinary engine lathe, operating on common work not exceeding [126] twenty inches of diameter, will require from twenty-five to thirty-five tools, which will serve for every purpose if they are kept in order and in place. A workman may get along with ten tools or even less, but not to his own satisfaction, nor in a speedy way. Each tool should be properly tempered and ground, ready for use 'when put away;' if a tool is broken, it should at once be repaired, no matter when it is likely to be again used. A workman who has pride in his tools will always be supplied with as many as he requires, because it takes no computation to prove that fifty pounds of extra cast steel tools, as an investment, is but a small matter compared to the gain in manipulation by having them at hand.
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TWO:(1.) Why cannot the parts of machinery be made to accurate dimensions by forging or casting?(2.) What is the difference between hand tool and machine tool operation as to truth?(3.) Why cannot hand-work be employed in duplicating the parts of machinery?(4.) What is the difference between standard and special machine tools?Hetty returned to her room, but not to sleep. The vague shadow of some coming trouble lay upon her. She was young and healthy, and she was engaged to one of the best men on earth. And they were going to be married soon. She ought to have been superlatively happy.
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