Tool Engineering Volume 1; Jigs and Fixtures - Softcover

Inhaltsangabe

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...vertical slide, so arranged that it can be moved up or down by means of the lever C, to which a weight D is often attached in order to provide a gravity feed. The table E has a cross movement operated by a lever. An over-arm F is arranged so that the arbor can be given an outboard support when desired. Another type of hand milling machine has a spindle mounted in a fixed head, the table being arranged so that it can be fed up and down by one lever and crosswise by another. This type is not shown in the diagram, but its construction will be readily understood. The class of work to which these machines are most suited consists of key-way cutting, slotting, light-facing or forming cuts, light straddle milling operations, or any other light work of a similar character. The machine, not being equipped with back gears, is not suited for any kind of heavy cutting nor is it adaptable to long surface cuts on account of its being a hand feed machine. For work on brass or aluminum parts, which require high surface speeds, this type of machine is a wonderful producer, rapid in operation and economical in upkeep. It is frequently utilized for light facing cuts by using an end mill. Plain Milling Machines.--The diagram at G shows a plain milling machine which is made in a number of sizes suitable for both light and heavy work. The smaller sizes are sometimes made without back gears while the larger machines are heavily geared and suitable for very heavy cutting. The same general type of machine, when adapted to very heavy cutting, is variously termed a "manufacturing milling machine" or a "heavy duty milling machine," according to the manufacturer's fancy. In this type of machine the spindle H is tapered at the end Fig. 121. Hand and Plain Milling Mac...

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