Browse Prior Art Database

Force Transducer for Disk-Wear Testing

IP.com Disclosure Number: IPCOM000041996D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Pontius, DJ: AUTHOR

Abstract

The present method of wear testing uses a flexible head suspension and a gram gage to apply a load to the head (Fig 1.). The fixed end of the suspension is fastened to a multi-component strain gage transducer (Fig 2.). The transducer is in turn mounted to a slide which enables the user to position the head relative to the disk. The disadvantages of the present system are: a) The actual load on the head depends on critical placement of the gram gage stylus, which is performed manually. Loading the head unevenly could result in scoring of the disk surface rather than simulating actual wear. b) The physical relationship between the head and the disk is also dependent on accurate placement of the load. c) "Rigid" mounting of the load-applying member independent of the force transducer can greatly influence the forces measured.

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Force Transducer for Disk-Wear Testing

The present method of wear testing uses a flexible head suspension and a gram gage to apply a load to the head (Fig 1.). The fixed end of the suspension is fastened to a multi-component strain gage transducer (Fig 2.). The transducer is in turn mounted to a slide which enables the user to position the head relative to the disk. The disadvantages of the present system are: a) The actual load on the head depends on critical placement of the gram gage stylus, which is performed manually. Loading the head unevenly could result in scoring of the disk surface rather than simulating actual wear. b) The physical relationship between the head and the disk is also dependent on accurate placement of the load. c) "Rigid" mounting of the load-applying member independent of the force transducer can greatly influence the forces measured. For example, the stylus could apply a side load as well as a load in the normal direction, independent of disk rotation. The improved force transducer for wear testing would overcome the prior method's disadvantages by incorporating the following features: a) A parallelogram design to maintain an accurate relationship between the head and disk (Fig 3). b) Strain gage bridges positioned on the beams of the parallelogram so that both a frictional component and a normal force component can be monitored. c) Optional flexible suspension to compensate for the lack of precision in head positioning of a particular...