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Title: |
1918 Article - Master Engine Lathes |
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Source: |
"Machinery," Vol. 24, No. 3, Nov. 1918, Pg. 258-259. |
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Insert Date: |
6/4/2020 8:09:58 AM |
MASTER ENGINE LATHES
The Master Machine Tool Co., 110-112 W. 40th St., New York City, has added to its line the two lathes illustrated and described herewith. It will be apparent that the design of these machines is essentially the same except that the lathe illustrated in Fig. 1 is provided with a geared head, while the machine shown in Fig. 2 has a cone head; also, the geared-head machine is furnished with an oil-pan and cabinet legs. With the exception of the features to which particular reference has been made, the following description will apply to both machines.
These lathes are intended for use in tool-rooms and on manufacturing work where accurate machining is required. The bed is designed with two wide-spread vees and two flat bearing surfaces, and is supported by cross braces to reduce vibration to a minimum. The splined lead screw is set immediately below the guides to obtain a steady motion for the carriage. The spindle is made of special carbon steel, accurately ground to size, and it has a hole through the entire length of ample size to take draw-in attachments and collets. The spindle runs in phosphor-bronze bearings, the large end being threaded to receive chucks and faceplates. There are two adjusting collars for taking up wear. Special means are provided for carrying the end thrust, so that smooth operation is insured under heavy cuts.
The apron is simply designed, with a detachable back plate that allows the removal of all parts for repair or inspection. The lead-screw is splined for driving the worm which operates the automatic longitudinal- and cross~feeds through a friction clutch. It is impossible for both feeds to be in operation at the same time, as a safety lever prevents engaging the split nut while either feed is in use, thus making the lathe practically fool-proof. The accurately milled thread of the lead-screw is only used for screw-cutting operations, so that the life of the screw is prolonged. The four-change feed-box has steel gears and provides for instantaneously obtaining the usual changes of feed, as, for instance, where it is desired to change from roughing to finishing. Threads are cut through the feed box as indicated on the gear plate. Regular equipment furnished with the machines consists of a countershaft, large and small faceplates, follow-rests and fixed steady rests, change-gears, and the necessary wrenches for making all adjustments.
On the geared-head lathe shown in Fig. i the headstock is equipped with all steel gears, which provide six changes of spindle speed ranging from 28 to 418 revolutions per minute. Drive is through a positive clutch. The headstock is secured to the bed by two 3/4-inch bolts. Changes of spindle speed may be easily and rapidly obtained by means of a lever and a hand wheel conveniently located on the head stock. The changes are so arranged that no two speeds can be engaged at the same time. All gears are completely enclosed and run in oil. On the cone-driven lathe illustrated in Fig. 2, the headstock is secured to the bed by three staybolts. This headstock is of the back-geared type, and the three-step cone pulley carries a belt two inches in width. |
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