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Title: |
1918 Article - AMTEW Engine Lathe |
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Source: |
"Machinery," Vol. 24, No. 3, Nov. 1918, Pg. 259-260. |
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Insert Date: |
6/4/2020 2:49:11 PM |
The American Machine Tool Engineering Works, 4854-4858 W. Kinzie St., Chicago, Ill., are now building the “Amtew” 14-inch high-power engine lathe illustrated and described herewith. One of the important features of this lathe is that in the apron there are four changes of cross- and longitudinal-feed, any of which can be obtained by simply moving the feed-change lever to one of four positions, which constitutes a quick and ef?cient means of making changes of feed. A back-gear shifting lever makes it possible to change the speed of the machine from the lowest range to the intermediate range of speeds without loss of time. The feed-rod is driven direct from within the headstock by a train of gears and an overload friction, no feed belt being employed. Overloading the feed by accident simply causes the friction to slip, thus preventing damage to the mechanism.
The headstock is of the bowl type, and the spindle is made of 60-point carbon crucible steel. The front spindle bearing is 2-7/16 inches in diameter by 4 inches long, and the spindle is bored to hold a bushing bored for No. 3 Morse taper. The spindle bearings are lined with bronze and accurately scraped to ?t the spindle. All gears subjected to severe service are made of steel and the idlers are hushed with bronze. The tail stock spindle is made of exceptional length, which gives ample rigidity as well as provision for drilling unusually deep holes with a twist drill without having to move the tailstock. The tailstock spindle is 1%, inch in diameter and has a maximum travel of over 8 inches. The carriage has a bearing 23 inches long on the ways, and the carriage bridge is 7-1/4 inches wide. The apron, including its bearings, is cast in one piece, and a safety device makes it impossible to throw in the half-nuts when either feed is connected. Mention has already been made of the fact that the feed change is located in the apron. The principal dimensions of this lathe are as follows: swing over ways, 14-5/8 inches; swing over carriage, 7 inches; distance between centers for six-foot bed, 36 inches; taper of centers, No. 3 Morse; diameter of hole through spindle, 1 5/16 inch; range for thread cutting, 1 to 48 threads per inch; cone pulley diameters, 51/2, 61/4 and 8 inches; width of belt, 2-1/2 inches; ratio of double back-gears, 3 to 1 and 8 to 1; number of spindle speeds, 18; range of spindle speeds, 30 to 655 R.P.M.; and weight of machine with six-foot bed, 1600 pounds. |
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