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Title: |
1868 Article-R. H. Barr & Co., Radial Drill |
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Source: |
Scientific American 16 Dec 1868 pg 385 |
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Insert Date: |
5/4/2012 10:52:54 PM |
Improved Radial Drill Press
There is no more indispensable machine, in metal-working establishments, than a good drill press, and much ingenuity has been shown in planning them so as to obtain the greatest possible efficiency for the least cost and weight of metal. The improved radial drill illustrated herewith has this advantage over others in ordinary use, that it adapts itself to the position of the work to be drilled, thus obviating the necessity of moving and adjusting the latter, which, in the case of heavy pieces, is often tedious and difficult.
The manner of accomplishing this will be readily understood by reference to the annexed figure, in which the spindle is shown in its proper position, over the table, for small work. The radiating arm is fitted to a neck at the top of the column, and traverses freely in all directions; in this, slides the head, carrying the drill-spindle and gearing, which is moved backwards and forwards by a rack and pinion and hand-wheels, one on each side of the machine.
It will be seen that the arm or swing is capable of being placed in any position, radiating from the column as a centre, and that the drill can hence be made to reach any point within the circle, except the part occupied by the column and the driving pulley. A large number of holes may thus be drilled in succession in the same surface, without moving the work, an advantage, which will commend itself to machinists. The difficulty of leveling up a piece to be drilled for every hole, the time thus spent, and the danger of moving it after starting the drill, are annoyances that do not attach to this machine. When once the work is judiciously and firmly placed, a series of holes may be drilled, each of which will be perfectly parallel with the others. We have seen the machine at work in a number of shops, and consider it an excellent tool. It is especially useful in fitting up such work as steam engine cylinders, steam chests, bed plates, etc. All work which cannot be conveniently handled may be drilled by once setting it, instead of frequent changes of its position, thus saving a vast amount of labor and inconvenience
They have been adopted by many of the best shops in the country. They are manufactured and sold by R. H. Barr & Co., Wilmington, De. |
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1868 R. H. Barr & Co., Radial Drill
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