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Turbine Drill Spindle

IP.com Disclosure Number: IPCOM000076603D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Arnold, WA: AUTHOR [+3]

Abstract

A turbine-driven drill spindle is supported for axial motion in gas bearings and reciprocated by a ball-and-socket joint to ease alignment criteria and enable reduction in overall size.

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Turbine Drill Spindle

A turbine-driven drill spindle is supported for axial motion in gas bearings and reciprocated by a ball-and-socket joint to ease alignment criteria and enable reduction in overall size.

In Fig. 1, spindle 1 reciprocates vertically in gas bearing sleeve 2 supported in stationary block 3. The spindle is rotated by an attached turbine 4 supported in thrust block 5 on thrust gas bearings 6. The thrust block is reciprocated by rod 7 through coupling 8 connected to hollow shaft 9. Shaft 9 is connected to housing 10 with a ball-and-socket joint 11 to overcome minor misalignment between the shaft and sleeve 2.

Pressurized bearing gas is directed to sleeve 2 through channels 12 in the sleeve. Thrust bearing gas is supplied via duct 13 to an upper annular recess 14, which in turn supplies gas to a plurality of ducts 15 above turbine 4. Some of the gas is also directed through channel 16 to a lower annular recess 17 to supply a plurality of ducts 18 at the lower face of the turbine.

Turbine gas is supplied through duct 19, hollow shaft 9, and ball joint 11 to the turbine reservoir 20. In Fig. 2, a large reservoir is provided to reduce flow resistance to convergent nozzles 21, which improves turbine reaction. Vents 22 allow escape of spent turbine gas.

This drill mechanism places less stringent alignment requirements on the moving and stationary parts and reduces the space formerly required for spindle guidance.

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