US Patent: 2,615,372
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| Milling Machine Spindle Axial Shift Control
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Patentee:
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| Edward E. Coffin (exact or similar names) - Providence, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 02, 1948 |
| Granted: |
Oct. 28, 1952 |
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Joel Havens
"Vintage Machinery" entry for Brown & Sharpe Mfg. Co.
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Description: |
| Maxwell Fish - patent attorney
The present invention relates to improvements in machine tools, and more particularly to a control device adapted for controlling the position axially of a milling cutter spindle and its axially shiftable supporting sleeve. The invention is herein disclosed in a preferred form as embodied in a horizontal-type milling machine which may be similar to that illustrated in U. S. Letters Patent to Bennett and Krause No. 2,068,840, dated January 26, 1937, for; Improvements in Milling Machines. The machine referred to, is provided with a longitudinally moving work table, a spindle support, and a milling cutter spindle disposed to rotate on a horizontal axis transverse to the direction of table movement within a spindle sleeve which is mounted on the spindle support to permit a limited axial adjustment of the sleeve and spindle relative to the table. For effecting such axial adjustment, there is provided a manually operable racking control and a manually operable clamping device which serves to rigidly clamp the spindle sleeve in its adjusted position. In the machine referred to, adjustment of the spindle axially and the clamping of the spindle in adjusted position are effected by separate rotatable control knobs located at one side of the spindle head. An axial adjustment of the spindle when made by manipulation of the manual controls referred to, would normally be maintained during the entire operation upon one or more work pieces as, for example, during the continuance of an automatic operation in which the table and work supported thereon are fed at a feed rate past the milling cutter for the performance of a milling cut thereon, and are then returned at a rapid traverse rate in the reverse direction to the starting position for the removal of the work and the substitution of a new work piece in operating position on the table. In the performance of face milling operations in which a face milling cutter is moved at a predetermined depth across the face of the work piece and is then returned at a rapid traverse rate in the reverse direction to the starting position in brushing contact with the previously milled surface of the work piece, it has been found, particularly where high speed cutters having hardened edges of cemented carbide are employed, that there is a tendency for the cutting surface to be chipped or otherwise marred by the light frictional contact with the work which takes place during the return movement.
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