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Title: |
1907 Article - An Automatic Slot-milling Machine |
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Source: |
"American Machinist," Vol. 30, No. 52, Dec. 27, 1907, Pg. 994. |
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Insert Date: |
5/24/2020 8:33:48 PM |
An Automatic Slot-milling Machine
The work done by this machine and shown in Fig. 2 is for use in knitting machinery, and the advantage of doing this automatically on a small machine, instead of tying up a regular milling machine, is obvious to any mechanic.
The work is held by an expanding-ring washer which is controlled by the nut in the center. This is on a plunger which is controlled by a heavy spiral spring that takes the strain from the index lock and is held down until the work is completed, When it is released by a lever at the bottom so that a new blank can be inserted.
The machine as shown is ready to start on a cut, feeding out from the center under control of the face cam at the back end of the ram or slide which carries the saw head. The edge cam this side of the face cam controls the vertical movement of the saw, which in this case makes a straight cut across the face of the ring and then is forced down so as to make a square cut at the outer edge of the ring. These movements can be easily traced from the cams which give positive control to both movements. The depth of cut is regulated by the micrometer adjustment on top of the depth stud shown over the saw.
The indexing mechanism is beneath the table and is so constructed that any number of teeth from one to fifteen can be taken at each step. In addition to this there is a positive lock on the index so that after the ratchet has carried the wheel the desired number of teeth, the index and work are held firmly while the cut is being taken.
The work shown is a bronze ring, 8 inches in diameter with 140 slots, which were cut in 45 minutes, including the time required to change the work for another piece, and it is also arranged to slot screw heads of all sizes and styles by using a hopper feed. In either case the machine is fully automatic.
The machine requires bench space of about 16 inches in width by 30 inches in length and, together with countershaft, weighs about 225 pounds. The cutter runs about 2000 revolutions per minute and work can be handled from 3 to 8 inches in diameter.
It is made by the Standard Manufacturing Company, Bridgeport, Conn. |
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