US Patent: 3,520,228
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| Spindle Orienting and Drawbolt Malfunction Sensing Machine Tool Control System
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Patentee:
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| Jack A. Wohfeil (exact or similar names) - Fond Du Lac, Fond Du Lac County, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 10, 1967 |
| Granted: |
Jul. 14, 1970 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract:
A machine tool control system with control circuits for arresting rotation of a machine tool spindle in a fixed rotary orientation position where a draw-bolt used to secure work tools in the spindle is rotatable relative to the spindle to release one work tool and grip another and control circuit for sensing any failure of the draw-bolt to properly rotate relative to the spindle. The same rotary position transducer provides signals representing draw-bolt rotary position, and, when the spindle is rotating, spindle rotary position and spindle rotary speed, and such signals are utilized in the control circuits both to delay actuation of the spindle arresting mechanism until the spindle arrives at the orientation position below a predetermined creep speed and to sense any failure of the draw-bolt to rotate properly relative to the spindle. |
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