GB840751A - Improvements in means for supporting members by liquid films, applicable to machine tools - Google Patents

Improvements in means for supporting members by liquid films, applicable to machine tools

Info

Publication number
GB840751A
GB840751A GB25664/57A GB2566457A GB840751A GB 840751 A GB840751 A GB 840751A GB 25664/57 A GB25664/57 A GB 25664/57A GB 2566457 A GB2566457 A GB 2566457A GB 840751 A GB840751 A GB 840751A
Authority
GB
United Kingdom
Prior art keywords
orifice
pump
orifices
base
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB25664/57A
Inventor
John Arthur Stokes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB25664/57A priority Critical patent/GB840751A/en
Publication of GB840751A publication Critical patent/GB840751A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
    • B23Q1/385—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports in which the thickness of the fluid-layer is adjustable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/02—Sliding-contact bearings
    • F16C29/025—Hydrostatic or aerostatic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/39—General buildup of machine tools, e.g. spindles, slides, actuators

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

840,751. Machine-tool details. BRITISH THOMSON-HOUSTON CO. Ltd. Aug. 11, 1958 [Aug. 14, 1957], No. 25664/57. Class 83 (3). [Also in Groups XXIX and XXXV] A member 1 such as the table of a machinetool, is maintained in a given plane at a given distance from a base or bed 2 by supplying oil under pressure from a pump 7 to at least three non-aligned orifices 3 (only one of which is shown), and controlling the oil pressure to each orifice in response to deviation of the corresponding part of the member 1 from the required spacing relative to the base 2. Upstream of each orifice 3 is a fixed replica orifice 6, to the same or different scale, so that a predetermined part of the total pressure drop between the pump and an annular discharge passage 4 surrounding the orifice 3, takes place across the orifice 6 when the member 1 is at the desired spacing from the base 2. The pressures before the orifice 6 and in the discharge passage 4 are fed to a computer 9, which produces an hydraulic or electrical &c. signal proportional to the sum of the two pressures, divided by an amount dependent upon the scale relationship between the orifices, so that the signal is proportional to an intermediate pressure between the two orifices when the member 1 and base 2 are at the desired spacing. The signal and the intermediate pressure are compared in a servo unit 10, which makes any necessary correction by action on the pump 7 when a separate pump for each orifice 3 is provided, or by action on the flow path between the pump and the orifice concerned when a single pump supplies all of the orifices.
GB25664/57A 1957-08-14 1957-08-14 Improvements in means for supporting members by liquid films, applicable to machine tools Expired GB840751A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB25664/57A GB840751A (en) 1957-08-14 1957-08-14 Improvements in means for supporting members by liquid films, applicable to machine tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25664/57A GB840751A (en) 1957-08-14 1957-08-14 Improvements in means for supporting members by liquid films, applicable to machine tools

Publications (1)

Publication Number Publication Date
GB840751A true GB840751A (en) 1960-07-13

Family

ID=10231313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25664/57A Expired GB840751A (en) 1957-08-14 1957-08-14 Improvements in means for supporting members by liquid films, applicable to machine tools

Country Status (1)

Country Link
GB (1) GB840751A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3260162A (en) * 1963-03-16 1966-07-12 Asquith Ltd William Slide bearings for machine tools
US3271086A (en) * 1962-10-26 1966-09-06 Mecanorga S A Device for maintaining constant the distance between adjacent surfaces of a reference body and a movable body subject to a variable external force
US3736818A (en) * 1970-07-10 1973-06-05 Asquith Ltd William Hydrostatic bearings
US4569562A (en) * 1982-10-27 1986-02-11 Canon Kabushiki Kaisha Method of and apparatus for controlling a fluid bearing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3271086A (en) * 1962-10-26 1966-09-06 Mecanorga S A Device for maintaining constant the distance between adjacent surfaces of a reference body and a movable body subject to a variable external force
US3260162A (en) * 1963-03-16 1966-07-12 Asquith Ltd William Slide bearings for machine tools
US3736818A (en) * 1970-07-10 1973-06-05 Asquith Ltd William Hydrostatic bearings
US4569562A (en) * 1982-10-27 1986-02-11 Canon Kabushiki Kaisha Method of and apparatus for controlling a fluid bearing

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