Seagate Technology Incorporated

Ronald Thomas Albo

Norbert Steven Parsoneault

Roger Allen Addy

Michael David Kennedy

Wesley R Clark

Matt L Shumway

Alan Lydon Grantz

Alan Lyndon Grantz

Lev Mikhailovich Dvoskin

To simplify fabrication of an integral hub piece, the opening between the upper and lower female cones in this hub has sufficient width or radial dimension to allow access to both cones from one side of the hub with the cutting tool. A cutting tool is used which has a width smaller than the opening between the cones. Preferably, the tool has a width which is about equal to or smaller than an angular dimension through this opening which is defined by extending surfaces of the upper and lower female cones. If this limitation is satisfied, both cones can be created with a single machine set up operating from one side of the integrated hub.

Single piece hub with integral upper and lower female cones

Methods of machining a single piece hub with integral upper and lower female cones includes providing a single piece hub with upper and lower conical voids having respective narrow ends proximal each other and respective wide ends distal each other. Surfaces of the voids are machined using a tool provided from a single side of the hub that is dimensioned to fit through an opening defined by the interface between the narrow ends of the conical void. The tool can be moved parallel to a rotational axis for accessing conical surfaces of both voids and perpendicular to the rotational axis while contacting the surfaces so as to produce a final machined surface.

Method of forming a hub for use in a disk drive motor

Single piece hub with integral upper and lower female cones and method for making the same

The operating precision of super precise machine tools can be significantly improved over their design specifications by the combination of careful set up, testing of the specific machine tool to determine the most accurate operating parameters of accuracy-critical components, providing suitably rigid cutting tool holders, and controlling the operation of the machine tool to operate within the most accurate operating parameters. Testing includes determining optimal operating speeds to achieve the best precision, resonant frequencies to be avoided, and cutting tool feed rates that deliver the most precision. Controlling the machine tool operation includes selecting the most beneficial rotational speed, feeding the cutting tool into the work piece at the most accurate speed and depth of cut, and always feeding the cutting tool into the work piece in one direction.

Method for improving the machining accuracy of a precision machine tool

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Campbell, CA, United States of America

Ronald Thomas Albo