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Title: |
1895 Article-William Sellers & Co., Drill Grinding Machine |
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Source: |
Modern Mechanism 1895 pg 405-406 |
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Insert Date: |
6/14/2011 7:41:13 PM |
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The Sellers Drill-Grinding Machine is represented in Fig. 1, with a drill in place ready to be ground. The drill is carried in a holder which is pivoted to the top of the main upright. The adjustment of the drill to any required angle of point between 90° and 130° of included angle is effected by swinging this holder about its center. The lips of the drill are chucked by two jaws, which are opened and closed by the hand-wheel A. The back end of the drill is steadied by an adjustable center-stop B. This stop is made reversible, being provided with a male center at one end and a female center at the other, the latter to be used with the small drills having no center-holes in their ends. The grinding wheel is carried on a shaft at the top of the water-box C. The lever D, raised and lowered by the right hand of the workman, passes the face of the grinding-wheel back and forth over the lip of the drill. The hand-wheel E adjusts the face of the stone to the lip of the drill; that is, it regulates the cut by setting up the stone closer to or farther from the part to be ground. To this hand-wheel is adapted an adjustable stop, which enables an adjustment to be made separately when grinding each lip, and yet permits them both to be gauged to the same length by means of this final stop. If the final grinding of both lips is made without any adjustment of the stone, the same result is obtained without the use of this stop. The grinding-wheel is protected by a cover, except where the drill comes in contact with it. In this cover is a curved water-way, through which water is delivered by an endless-belt pump, and from which it is thrown on the face of the stone and on the end of the drill in a continuous stream. The ball-handle F, operated by the left hand of the workman, rotates the drill back and forth in front of the grinding-wheel in a way to insure the proper clearance. |
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1895 William Sellers & Co., Drill Grinding Machine
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