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Title: |
1911 Article-Nutter & Barnes Co., Automatic Saw Sharpener |
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Source: |
Machinery Magazine, V17, Jun 1911, pg. 838 |
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Insert Date: |
12/8/2018 10:00:46 PM |
The Nutter & Barnes Co., Boston, Mass, has brought out an automatic saw sharpener that is adapted to the forming of Brown & Sharpe patent, relieved teeth for cutting soft metals, or for plain saw gumming. The special feature of this machine is that it will sharpen, hacked, and form a relieved tooth at one setting, and in the same time as required for plain gumming. The four different operations necessary to form one relieved tooth are performed by means of cams and gears at each advance of the main gumming-wheel, and from 40 to 50 saw teeth can be formed per minute, the number depending on the diameter of the saw.
The saw is indexed by a disk, 12 inches in diameter, having the same number of teeth as the saw being sharpened. The function of the gumming-wheel is to gum, sharpen the face, back-off, and regulate the two lengths of saw teeth, the narrow alternating teeth being 1/64 inch longer than the full width teeth. The two 4-inch narrow grinding wheels shown, bevel and form the clearance of the alternating bevel teeth on the beveled part. As the wheels are gradually withdrawn and the saw starts to revolve, the proper clearance is given to the bevel. In the same way, the full-width as well as narrow teeth, receive their regular backing off from the corner of the beveled wheel; that is, while the teeth are revolving past it.
The different numbers of teeth in saws, and the variations required in backing them off, are obtained from an adjustable feed cam in which holes are located in the proper position to receive an index pin carried in an arm on the cam shaft, each hole being marked for the different numbers of teeth in saws of various diameters. This machine will also sharpen the face and form the gullet of a plain straight saw-tooth, and in this case the indexing is also regulated by a plate having the same number of teeth as the saw being sharpened. These machines are built in two sizes—for saws ranging from 12 to 20 inches in diameter and from 12 to 36 inches, respectively. |
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1911 Nutter & Barnes Co., Automatic Saw Sharpener
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