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Title: |
1895-6 Articles-Newark Machine Tool Works, Horizontal Boring Machine |
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Source: |
Illustrations and Details of American Machine Tools-MIT 1896 pg 48 & Modern Mechanism 1895 pg 77 |
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Insert Date: |
2/17/2019 2:13:58 PM |
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A horizontal boring and drilling machine made by the Newark Machine-Tool Works is shown in Fig. 2. The work is bolted to the compound carriages which are shown directly under the boring-bar. the work being set square by the top surface and the edges of the carriage. The carriages can be moved either across or along the movable table, which is shown supported by the two large screws. The table can be lowered or raised from the side or at the end. as desired. A yoke of great strength braces the table, and serves as a bearing for the bar or boring arbor. The boring-bar is fed by a rack and pinion; and it is held by a friction-clamp, so that, by easing the clamp and taking another grip, a very long feed can be obtained. There is a quick and slow hand motion for the bar. The power-lift for the table is a feature peculiar to these machines. The lower ends of the table lifting-screws are carried by worm-gears threaded to serve as nuts. These gears take their motion from the worm-shaft, which is driven from the feed-shaft by means of the chain-gearing. In this way, the power from the driving-cone is used to lift the table, and this arrangement enables the workman to move the table without leaving his position, and, when the work is nearly set, he can throw the power-lift out of gear and make the delicate final adjustment by hand, using the slow-feed hand-wheel. The machine has self acting feeds in both directions, without reversing the directions of the motion of the cone, and a range of feed from 1/4 to 1/80 in |
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