US Patent: 3,620,586
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| Preload Spindle Bearing for Machine Tool
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Patentee:
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| Charles R. Maastricht (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: |
Feb. 12, 1970 |
| Granted: |
Nov. 16, 1971 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract
A spindle mounting for a machine tool adapted to apply a predetermined light preload to the spindle bearings during high-speed operation and a predetermined higher preload during low-speed operation. The preload mechanism includes a pair of axially aligned hydraulically actuated pistons disposed on opposite sides of one of the outer bearing races. The pistons have a relatively narrow annular shape and do not extend radially outward substantially beyond the bearing, thereby minimizing the headstock space required. The outer periphery of each spindle bearing is formed with annular grooves through which a cooling fluid may be circulated for more efficient cooling of the bearings. Such cooling grooves also permit the bearings to be directly mounted in the headstock housing without containment in an intermediate cooling sleeve, thereby providing more accurate spindle support. |
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