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Title: |
1895 Article-Pratt & Whitney Co., Lapping Machine |
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Source: |
Modern Mechanism 1895 pg 407-408 |
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Insert Date: |
6/14/2011 9:09:24 PM |
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Lapping-Machine.—This is a grinding device consisting of a lead or other soft metal surface, on which emery or oil is used. The machine shown in Fig. 3 is made by the Pratt & Whitney Co., for grinding thin, flat pieces that can not well be clamped for milling without retaining their winding irregularities. With this machine it is claimed that an unskilled workman can grind a true surface at much less expense than milling would cost. The diameter of lap is 18 in.; weight of machine, 1,100 lbs.; speed of lap, 1,500 revolutions per min. |
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1895 Pratt & Whitney Co., Lapping Machine
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