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Title: |
1895 Article-Thomas Shanks & Co., Drilling Machine for Boiler Stay-Holes |
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Source: |
Modern Mechanism 1895 pgs 186-187 |
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Insert Date: |
6/8/2011 8:00:50 PM |
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Drilling-Machine for Boiler Stay-holes.—Fig. 7 represents a drilling-machine built by Thomas Shanks & Co., Johnstone, Scotland, for drilling and tapping the holes for screwed stays in boiler shells and backs. There are two drills carried by separate standards, each having a traverse of 20 ft. The vertical range is 10 ft. The spindle may be set at an angle of 25°. The bed is 4 ft. 6 in. wide. In the driving head-stock are four speed-cones and two purchases of gearing for light or heavy work, instantly interchangeable by levers. The standard is moved by a grooved driving-shaft with fast and loose pulleys, and the reversing motion is by bevel-gear and clutches worked by hand. The vertical driving-shaft has strong bevel gear and clutches to stand the tear and wear of reversing, and connects by the driving-gear to a spindle 3½ in. in diameter. Two bevel-wheels—one fine and the other coarse pitch—are keyed on the revolving tube carrying the spindle. Quick motion is obtained through direct gear and slow motion by spur-wheel and pinion. The drill-carriage is balanced and its level is alterable at will. There is a second standard in tho machine, with a horizontal driving shaft in the bed parallel to the other. Revolving cradles are placed in front of the machine, and these are not only adjustable for different diameters and lengths of boilers, but also in such a manner as to support a boiler with either its back or its side toward the drills, as may be required. When used for the latter purpose, the cradles can be revolved by power, so as to bring a new part of the shell within range of the machine. (See Engineering, Oct. 24, 1890.) |
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1895 Thomas Shanks & Co., Drilling Machine for Boiler Stay-Holes
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