Heavy-duty live centers

Turning – Severing or cut-off – Interrelated means for tool infeed and circumrotation

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Details

76101R, 82 30, B23B 2304

Patent

active

039876934

ABSTRACT:
This invention pertains to the construction and method of construction of heavy-duty live centers having a workpiece carrying capacity of from 35 to 250 tons. A quill-type outer member is employed with heavy-duty roller bearings in one portion of this center. Minimum capacity of this type of center is more than a 10 ton workpiece. The rotating spindle in this quill is designed to be supported by heavy-duty bearings which are so mounted in the bore in the quill housing that the spindle is allowed to bow to a determined extent, this bowing occurs when the spindle is loaded with a heavy workpiece. A heavy-duty self-aligning angular radial bearing assembly is carried in the front end of the bore of this live center. An angular roller thrust bearing having a determined outer race is fitted into a bore which is a determined amount oversized and enables the bearing to move into misalignment of the theoretical center line so that the actual center of the bearing and the center of the live spindle, when bowed with the load of the workpiece, is in coincidence. The amount of bowing of the spindle because of the loading of the workpiece is a function of the load in accordance with the diameter of the spindle.

REFERENCES:
patent: 1984718 (1934-12-01), Wistrand
patent: 2142639 (1939-01-01), Fish
patent: 2798396 (1957-07-01), Lee

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