DRILL SPINDLE UNIT
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United States of America Patent
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Issued Date -
Oct 20, 2011
app pub date -
Nov 3, 2009
filing date -
Nov 5, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A drill spindle unit includes a housing, and a rotatable and longitudinally displaceable drill spindle provided with axial keyways for cooperation with internal projections of a drill spindle surrounding rotation drive sleeve, and a screw thread for cooperation with an internal thread of a drill spindle surrounding feed drive sleeve. Bearings for radial as well as axial support of the drill spindle relative to the housing are provided. The radial support bearings are arranged to transfer radial forces only, and a thrust bearing is arranged to transfer axial forces between the housing and the drill spindle. The thrust bearing is associated with an axial load sensing device by which signals are generated in response to the axial load applied on the drill spindle.
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