. American engineer and railroad journal . plain spindle is that the shaftcarrying the back gear protrudes through the headstock andnecessitates that the face plate should be carried further awayfrom the headstock. The eccentric is by far the quickest tooperate, and if well made is. in my opinion, quite equal to tieother.—A Large User of Machine Tools. 244 AMERICAN ENGINEER AND RAILROAD JOURNAL MOTOR DRIVEN MACHINE TOOLS. Examples of Individual Drives Aitlied to Boring Mills. An important feature of the development of railroad macliineshop practice is the greatly increasing use of the boring m
. American engineer and railroad journal . plain spindle is that the shaftcarrying the back gear protrudes through the headstock andnecessitates that the face plate should be carried further awayfrom the headstock. The eccentric is by far the quickest tooperate, and if well made is. in my opinion, quite equal to tieother.—A Large User of Machine Tools. 244 AMERICAN ENGINEER AND RAILROAD JOURNAL MOTOR DRIVEN MACHINE TOOLS. Examples of Individual Drives Aitlied to Boring Mills. An important feature of the development of railroad macliineshop practice is the greatly increasing use of the boring large number of machining operations in railroad repairwork that can be handled on the boring mill to far better ad-vantage than upon the lathe is the factor that has been effectivein bringing it into very extensive use in railroad shops. Inthe locomotive machine shop alone of the CoUinwood shops * CHAIN DRIVE IlON A llOIUNi; UAITSH .MACHINE TOOL CONTROL VARIABLE-SPEED MOTOR.—GENERAL ELECTRIC five boring mills have been installed, of the following sizes:two 84-in., one 54-in. and two 37-in., all of which are equippedfor individual driving by electric motors. Accompanying this development has arisen the question asto the best method of driving. In all applications to railroadmachine shop work they have been installed in sizes suffi-ciently large to warrant the application of individual motordrives. Also the individual drive furnishing variable speedsis particularly applicable to the boring mill on account of thewidely varying classes of work to which it is adapted. Theresult is that a large number of excellent and very interestingmotor drives have been installed upon tools of this type, withvery satisfactory results. Below are presented some repre-sentative examples of such motor drives whi<h will indicatethe trend of progress in this direction. The two engravings at the left illustrate an excellentarrangement of mounting a motor
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
