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Title: |
1880 Article-Brainard Milling Machine Co., #7 Plain Milling Machine |
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Source: |
American Machinist, 10 Apr 1880, pg. 3 |
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Insert Date: |
7/7/2015 8:04:45 PM |
New Milling Machine
The milling machine, herewith illustrated, is a recent production of the Brainard Milling Machine Co., Boston, and is intended to meet the requirements of gun and sewing machine manufacturers and all other parties using plain milling machines. The depth of bed is remarkable, and it is supported on substantial, wide reaching legs. The head is cast solid with the bed, and is heavily braced, not only above, but below the top of bed. The spindle is mounted on a heavy, square plate, having two tenons on its back, which move in guides on the head, to which it is rigidly held by four ¾-inch bolts. It is adjusted by a single screw, and has stop screw under spindle carrier.
This arrangement secures an exactness hardly possible in the old style of "plain" machines, where accuracy depends on the equal movement and wear of two screws and two gear wheels. The spindle-gear is 16 inches in diameter, connected by a small pinion and a 3-pulley cone for 2½ inch belt. The driving gears are connected by a link, and are undisturbed by any changes in position of the spindle. The spindle is large, and is from dense hard steel, made expressly for the purpose. The feed-worm is of steel, and is kept constantly oiled by the device shown in cut. The automatic drop motion is an original device, positive in action and simple in design.
There are four changes of feed. A back-stand, with elevating screw and carrying a back-center to support outer end of mill arbor, is bolted to the bed.
The machine weighs about 1400 lbs. The automatic screw-feed is 13 inches; table 26 inches long; highest elevation of center from table, 8 inches. The distance between head and foot stand is 14½ inches. The speed of countershaft should be about 100 revolutions per minute. |
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1880 Brainard Milling Machine Co., #7 Plain Milling Machine
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