US Patent: 3,540,346
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| Machine Tool Having Longitudinally Adjustable Machining Spindle Hydraulically Clamped for Operation
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Patentee:
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| Gordon H. Jones (exact or similar names) - Van Dyne, Fond Du Lac County, WI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 12, 1968 |
| Granted: |
Nov. 17, 1970 |
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Joel Havens
"Vintage Machinery" entry for Giddings & Lewis Manufacturing Co.
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Description: |
| Abstract:
A machine tool having a longitudinally adjustable machining spindle carried by a rotary spindle sleeve and securely clamped releasably within the sleeve by a clamping bushing encircling the spindle with very little maximum clearance therebetween and having an interference fit with encircling structure on the sleeve so that the clamping bushing has a high residual stress in compression even when released from the spindle for longitudinal adjustment of the latter with the consequence that high hydraulic pressure applied to predetermined areas of the external surface of the clamping bushing effects hard compressive contact with the spindle of bushing structure opposed by the hydraulic pressure and adjacent structure of the hushing unopposed by the hydraulic pressure is continuously forced into hard compressive contact with the encircling structure on the sleeve to the end that the spindle when clamped in a longitudinally adjusted working position is securely supported radially in a position precisely coaxial with the spindle sleeve. The clamping bushing is assembled with the encircling structure on the spindle sleeve with which it has a marked interference fit by forcing the bushing longitudinally into the encircling structure thus producing a high compressive stress in the bushing, which is subsequently ground internally with great precision to fit closely around the spindle with minimal clearance for longitudinal adjustment of the spindle. |
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