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Title: |
1921 Article-Pratt & Whitney Co., Bench Hand Milling Machine |
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Source: |
Machinery, V28, Oct 1921, pg. 155 |
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Insert Date: |
6/24/2016 9:49:44 PM |
An addition to the line of machine tools built by the Pratt & Whitney Co., Hartford, Conn., is the No. 3 bench hand milling machine here illustrated. The spindle and draw-back on this machine is identical to that provided on the No. 3 bench lathe manufactured by the same concern and therefore all the spindle attachments of the bench lathe interchange on the milling machine. The table of the latter is of a design suitable for mounting of attachments and it accommodates the headstock and tailstock of the bench lathe. All screws on the machine are equipped with micrometer dials graduated to 0.001 inch.
The spindle is made of tool steel, is hardened and ground, and has a conical front end. The front spindle bearing has a double taper, and is also made of tool steel and hardened and ground. A "Non-Gran" bronze bearing is provided at the rear of the spindle. Both bearings are adjustable for wear. The spindle is driven through a three-step cone pulley, which provides speeds ranging from 153 to 1510 revolutions per minute. The special equipment which can be furnished for this machine includes a swivel vise graduated in degrees, an index quill center, a tailstock, arbors for saws, a right-angle adapter, and a vertical milling attachment. The latter is mounted over the spindle nose and is driven by a plug placed in a draw-in collet. |
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1921 Pratt & Whitney Co., Bench Hand Milling Machine
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