US3594953A - Cooling arrangement for thread-grinding machines - Google Patents

Cooling arrangement for thread-grinding machines Download PDF

Info

Publication number
US3594953A
US3594953A US816211A US3594953DA US3594953A US 3594953 A US3594953 A US 3594953A US 816211 A US816211 A US 816211A US 3594953D A US3594953D A US 3594953DA US 3594953 A US3594953 A US 3594953A
Authority
US
United States
Prior art keywords
workpiece
coolant
thread
valve
grinding
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 - Lifetime
Application number
US816211A
Other languages
English (en)
Inventor
Gerhard Stade
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.)
Herbert Lindner GmbH
Original Assignee
Herbert Lindner GmbH
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 Herbert Lindner GmbH filed Critical Herbert Lindner GmbH
Application granted granted Critical
Publication of US3594953A publication Critical patent/US3594953A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/14—Methods or arrangements for maintaining a constant temperature in parts of machine tools
    • B23Q11/145—Methods or arrangements for maintaining a constant temperature in parts of machine tools using a jet of gas or cutting liquid
    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/022—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for helicoidal grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant

Definitions

  • a thread-grinding machine including a grinding table supporting a grinding wheel between two work centering spindles, of which a tail stock centering spindle is biased toward the other spindle, and further including a discharge nozzle, for a first coolant flow, at the grinding wheel support.
  • a workpiece cooling arrangement includes a series of second discharge nozzles for a second controllable coolant flow, arranged at the grinding table in the area between the centering spindles.
  • Valve means control the second coolant flow, and electric precision feeler means are operatively associated with the spring biased table stock centering spindle to open the valve means responsive to a predetermined axial expansion of the workpiece.
  • the valve means include a magnet valve and a motor valve.
  • a cooling unit is disposed in a reservoir for the second coolant, and is activated whenever the temperature of the workpiece continues to increase as determined by axial expansion ofthe workpiece.
  • a known cooling arrangement for a thread-grinding machine has a main coolant line which divides into two branch lines connected to nozzles, one nozzle being located below the workpiece and the other nozzlebeing located above the workpiece.
  • the two nozzles are oriented toward each other so that the discharging flows of coolant will meet at a common working point.
  • Each nozzle is adjustable independently of the other. Valves are disposed in the inlet lines of the two coolant flows, to allow the desired quantity of coolant to be supplied in a unit of time to the upper and lower nozzles.
  • Such an arrangement is shown, for example, in Swiss Pat. No. l40,2()2.
  • the two nozzles are disposed at the periphery of the grinding wheel so as to be mutually staggered, the nozzle oriented toward the grinding point being located above the grinding point, and the other nozzle being oriented toward the lower vertex of the grinding wheel.
  • An arrangement of this type is shown, for example, in German Pat. No. 701,220.
  • Thread-grinding machines using two liquid coolants are disclosed, for example, in Machinery, London, Aug. 1 l, 1949, page 207 and in Wekstattstenchnik & Machinenbau, Vol. 39 (1949), pages 368 and 369.
  • two different liquids are introduced to the grinding wheel.
  • One of the two liquids is, for instance, sulfonated or chlorinated oil impinging on the grinding wheel in a number of high velocity jets, thus forming an oil film on the peripheral surface of the wheel, and this is supposed to improve the grinding operation.
  • the second liquid is water, and is introduced in considerable quantity under low pressure to that part of the grinding wheel covered with an oil film.
  • both liquids are separated from each other again in separate tanks, or by means of centrifuges, and are then led through a heat exchanger to dissipate the heat absorbed during the grinding operation, before the liquids are returned to the grinding wheel by circulating pumps.
  • This invention relates to thread-grinding machines and, more particularly, to an improved and more efficient cooling arrangement therefor.
  • the invention is directed to the problem of improving the grinding accuracy of threadgrinding machines, especially during grinding of long spindles.
  • discharge nozzles for a second, controllable flow of coolant are disposed at the grinding table in the area between the spindles or centers receiving the workpiece, of which preferably the tailstock center is supported so as to be axially biased in a known manner.
  • the tailstock center acts upon an electric precision feeler which, in settable switching steps, actuates at least one valve in the second coolant flow and additionally activates a cooling unit.
  • the electric precision feeler opens, in a first switching position, a magnet valve having a constant flow cross section, and switches on the cooling unit, by means of a make-before-break contact in a secondswitching position, in addition to maintaining the magnet valve operated.
  • the electric precision feeler actuates a motor valve whose flow cross section can be regulated, and switches on a cooling unit at a maximum flow with acontinued increase in the length of the workpiece.
  • the electric precision feeler may function in accordance with the principle of an inductive measuring instrument, such as is known per se.
  • the electric precision feeler may, in accordance with another embodiment of the invention, actuate a magnet valve and a controllable motor valve, each associated with a respective pump which respectively pump uncooled and cooled coolant from two respective chambers of the coolant tank into a common main connected to the discharge nozzles.
  • a thermostat adjustable to a minimum temperature of the cooling unit, may serve for deactivating the cooler unit.
  • a distributor line is arranged at the grinding table, and at least partially flexible tubular lines, approximately equally spaced, branch off from this distributor line.
  • the branch lines are equipped with the discharge nozzles, which can be oriented toward the workpiece over the length of the latter.
  • An object of the invention is to provide improved cooling arrangement for a thread-grinding machine.
  • Another object of the invention is to provide such a cooling arrangement in which, in addition to a first coolant flow directed at a thread-grinding wheel, a second coolant flow is directed along substantially the entire length of the workpiece.
  • a further object of the invention is to provide such a cooling arrangement in which flow of the second coolant is controlled in accordance with a heat expansion of the workpiece during grinding.
  • Another object of the invention is to provide such a cooling arrangement in which, responsive to a continued expansion of the workpiece, a cooling unit, for cooling the second coolant, is activated.
  • a further object of the invention is to provide such an arrangement including a thermostat, adjustable to a minimum temperature, serving to deactivate the cooling unit.
  • Another object of the invention is to provide such an arrangement including a distributor line extending along the grinding table, at least partially flexible tubular lines, approxiniately equally spaced, branching off from the distributor lines, and discharge nozzles connected to the respective distributor lines and which can be oriented toward the workpiece over the entire length of the latter.
  • a further object-of the invention is to provide such a cooling arrangement in which the discharge of the individual nozzles can be adjusted independently of all other nozzles, either manually or mechanically.
  • FIG. 1 is somewhat schematic elevation view, partly in sec tion, of a thread-grinding machine provided with the cooling arrangement embodying the invention
  • FIG. 2 is an enlarged side elevation view of the machine shown in FlG.1;
  • FIG. 3 is a schematic view of a modified form oftlie cooling arrangement, in which a motor valve controls flow of the second coolant;
  • HO. 4 is a schematic view of a modified form of the cooling arrangement, involving a mixing valve arrangement.
  • the thread--grinding machine includes a bed i, a grinding table 2, a workpiece spindle box 3 having a spindle center 4, a tailstock 5 with a tailstock spindle center 6, and a grinding wheel support 7 carrying a profiled grinding wheel 8.
  • the workpiece 9 is a long threaded spindle whose thread is being ground, and which is chucked between the centers 4 and 6.
  • the workpiece receives its rotary motion through a driver and a dog, neither of which is shown as they form no part of the present invention.
  • a coolant discharge nozzle 10 which is oriented toward grinding wheel 8, and hence toward the respective grinding point when the workpiece is led past the grinding wheel due to the back and lorth motion of the grinding table.
  • This discharge nozzle which is provided for the usual coolant flow, communicates with a pump 13 through a conduit 1i having a shutoff valve 12 built thereinto. Pump 13 is operatively associated with a coolant tank 14.
  • Tailstock S has a spindle center which is supported so as to be spring biased in an axial direction toward the centering spindle 4, and tailstocks of this type are already known so therefore the tailstock has been shown schematically only.
  • the axially movable spindle sleeve is illustrated at 15, as being engaged by a compression spring id whose preloading is settable by a handwheel 17 through the medium ofa threaded spiridle 18.
  • Precision feeler 22 has contacts 25, 26 and 27, of which the central contact 27 is a make-before-break contact.
  • Control conductors 28 connect precision feeler 22 to amplifier 29, which is connected through conductors indicated at 30 to a magnet valve 31. This magnet valve, when opened, has a constant flow cross section for the second coolant flow which is pumped to magnet valve 31 through conduit line 30 by pump 32.
  • a flexible conduit 34 connects magnet valve 31 to a conduit 35 which is stationarily disposed within grinding table 2 and which, in turn, communicates with the distributor line 36 stationarily disposed on the grinding table.
  • a plurality of at least partially flexible tubular lines 37 are approximately equally spaced along distributor line 36, these tubular lines 37 branching from distributor line 36.
  • Respective discharge nozzles 38 are provided for each flexible tubular line 37, and these discharge nozzles are oriented toward workpiece 9 over the entire length of the latter.
  • Tubular lines 37 are provided with joints 39, for adjustment thereof, and with control valves 40 by means of which the flow through each nozzle 38 may be adjusted.
  • the first coolant flow illustrated in FIG. 2, is indicated at 41, and the second coolant flow at 42. Both coolant flows are caught in trough 43 of grinding table 2, from which they drain as indicated by the arrow 44. The drained coolant reaches return line 45. and is thence delivered back to coolant tank 14.
  • cooling unit 46 Located in coolant tank 14 are cooling unit 46 and a thermostat 457, which controls cooling unit 46 by means of an electric line 48.
  • An electric line 49 connects cooling unit 46 with amplifier 2).
  • Cooling unit 46 is activated, in addition to magnet valve 31, after the make-before-break contact 26 has moved to the switch position 24, and the cooling unit is dcenergized by thermostat 47 at a selected minimum temperature of the coolant in tank 14.
  • an inductive-type electric precision feeler 22a is used, and permits a continual field regulation of a motor valve 31a whose motor M is a variable speed motor.
  • cooling unit 46 is activated through a line 49 branching from amplifier 29.
  • a mixing valve arrangement in a third embodiment of the invention, shown in H0. 4, includes magnet valve 31 and adjustable motor valve 310. Through respective lines 30 and 30a, magnet valve 31 and adjustable motor valve 31a'are connected to amplifier 29. In turn, amplifier 29 is connected by lines 28 to the inductive precision feeler 22a.
  • a pump 32 connected to valve 31 through a conduit 33, and a pump 32, associated with motor valve 30a is connected to the latter through a conduit 33a.
  • the coolant tank has a built-in separating wall 50 with an overflow, this dividing the coolant tank into two chambers 14a and 14b.
  • the uncooled coolant is in chamber 140, and the coolant cooled by cooling unit 46 is in chamber 14b.
  • the mixed coolant flows through line 34, connected to the outlets of magnet valve 31 and motor valve 31a, to discharge nozzles 38 for the second coolant flow 42.
  • the coolant pump 13 in cooled chamber 14b of the coolant tank supplies the discharge nozzle 10, for the first coolant, which is oriented toward the grinding point.
  • a workpiece cooling arrangement as claimed in claim 1, in which said precision feeler-means is an electric precision feeler which has settable switching positions.
  • rangement in a thread-grinding machine, rangement, as claimed in claim 2, operable to cool the second coolant.
  • a workpiece cooling arrangement in a thread-grinding machine, including a motor operated valve having a variable flow cross section which can be adjusted; said electric precision feeler controlling said motor operated valve.
  • a workpiece cooling arrangement as claimed in claim 5, in which said precision feeler activates said cooling unit at maximum flow of said motor operated valve, with continued increase in the length of the workpiece.
  • valve means comprises a mixing valve arrangement including magnet valve and controllable motor operated valve; a coolant reservoir; means dividing said coolant reservoir into two chambers, one having said cooling unit disposed therein; a first pump means supplying coolant from the other chamber to said magnet valve; a second pump means supplying coolant from said one chamber to said motor-operated valve; and a common output conduit connecting the outlets of-said magnet valve and said motor-operated valve to said second discharge nozzles.
  • a thread-grinding machine, a workpiece cooling arrangement as claimed in claim 3, including a thermostat subjected to the second coolant and settable to a minimum temperature thereabove; said thermostat deactivating said cooling unit when the second coolant has said minimum temperature.
  • a workpiece cooling arrangement including a distributor conduit at said grinding table; a plurality of at least partially flexible tubular conduits connected to said distributor conduit at approximately equally spaced intervals; said second discharge nozzles comprising respective nozzles connected to each of said flexible conduits, said second discharge nozzles being orientable toward the workpiece over the entire length of the latter.
  • a workpiece cooling arrangement as claimed in claim 9, including respective means operable to regulate the flow through each flexible conduit independently of each other flexible conduit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
US816211A 1968-07-02 1969-04-15 Cooling arrangement for thread-grinding machines Expired - Lifetime US3594953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681752684 DE1752684B1 (de) 1968-07-02 1968-07-02 Kuehlvorrichtung an Gewindeschleifmaschinen

Publications (1)

Publication Number Publication Date
US3594953A true US3594953A (en) 1971-07-27

Family

ID=5692904

Family Applications (1)

Application Number Title Priority Date Filing Date
US816211A Expired - Lifetime US3594953A (en) 1968-07-02 1969-04-15 Cooling arrangement for thread-grinding machines

Country Status (4)

Country Link
US (1) US3594953A (enExample)
CH (1) CH482504A (enExample)
DE (1) DE1752684B1 (enExample)
GB (1) GB1238967A (enExample)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4657068A (en) * 1985-06-14 1987-04-14 Bruce Zimring Device for facilitating the circulation of fluid coolant
EP0995544A1 (fr) * 1998-10-21 2000-04-26 Service et Technique Mace Thierry Dispositif de refroidissment de l'huile de coupe d'une machine-outil
US6083084A (en) * 1998-01-26 2000-07-04 Toyota Jidosha Kabushiki Kaisha Machining apparatus and process using cold gas stream, and cold gas stream cooling device and method for centerless grinder
US6669532B1 (en) * 1997-12-24 2003-12-30 Toyota Jidosha Kabushiki Kaisha Device and method for cool air cooling type machining
US8568198B2 (en) 2010-07-16 2013-10-29 Pratt & Whitney Canada Corp. Active coolant flow control for machining processes
US20140099870A1 (en) * 2012-10-09 2014-04-10 Samsung Display Co., Ltd. Grinding apparatus for a substrate
US20180036857A1 (en) * 2016-02-17 2018-02-08 Nsk Ltd. Grinding apparatus, method of manufacturing rolling bearing, method of manufacturing vehicle and method of manufacturing machine
CN112975656A (zh) * 2021-01-29 2021-06-18 浙江伯特利科技股份有限公司 一种平板闸阀阀体加工用研磨装置及加工工艺
CN113231927A (zh) * 2021-05-19 2021-08-10 成都宏明双新科技股份有限公司 一种打磨异形零件的方法
CN113245895A (zh) * 2021-05-20 2021-08-13 张洪刚 一种多轴加工用自动防止碎屑飞溅划伤工件的智能化装置
CN114147553A (zh) * 2021-11-12 2022-03-08 安徽亚珠金刚石股份有限公司 一种用于人造金刚石制品表面精细打磨设备
CN116787275A (zh) * 2023-08-08 2023-09-22 临清市康氏轴承有限公司 一种推力滚子轴承精加工装置
CN118752328A (zh) * 2024-09-05 2024-10-11 江苏海泰光电材料科技股份有限公司 一种高纯铝平面靶材磨削加工装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9719969D0 (en) * 1997-09-20 1997-11-19 Western Atlas Uk Ltd Improved grinding process
TWI716199B (zh) * 2019-11-20 2021-01-11 寅翊智造股份有限公司 多軸工具磨床之冷卻機構

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043056A (en) * 1959-05-18 1962-07-10 Cincinnati Milling Machine Co Machine tool construction to eliminate effect of expansion in members
US3303731A (en) * 1962-12-25 1967-02-14 Zawistowski Ferdynand Temperature controlled lathe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043056A (en) * 1959-05-18 1962-07-10 Cincinnati Milling Machine Co Machine tool construction to eliminate effect of expansion in members
US3303731A (en) * 1962-12-25 1967-02-14 Zawistowski Ferdynand Temperature controlled lathe

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4657068A (en) * 1985-06-14 1987-04-14 Bruce Zimring Device for facilitating the circulation of fluid coolant
US6669532B1 (en) * 1997-12-24 2003-12-30 Toyota Jidosha Kabushiki Kaisha Device and method for cool air cooling type machining
US6083084A (en) * 1998-01-26 2000-07-04 Toyota Jidosha Kabushiki Kaisha Machining apparatus and process using cold gas stream, and cold gas stream cooling device and method for centerless grinder
EP0995544A1 (fr) * 1998-10-21 2000-04-26 Service et Technique Mace Thierry Dispositif de refroidissment de l'huile de coupe d'une machine-outil
FR2784918A1 (fr) * 1998-10-21 2000-04-28 Service Et Tech Mace Thierry Dispositif de refroidissement de l'huile de coupe d'une machine-outil
US8568198B2 (en) 2010-07-16 2013-10-29 Pratt & Whitney Canada Corp. Active coolant flow control for machining processes
US8821212B2 (en) 2010-07-16 2014-09-02 Pratt & Whitney Canada Corp. Active coolant flow control for machining processes
US20140099870A1 (en) * 2012-10-09 2014-04-10 Samsung Display Co., Ltd. Grinding apparatus for a substrate
US11298790B2 (en) 2016-02-17 2022-04-12 Nsk Ltd. Method of manufacturing rolling bearing, method of manufacturing vehicle and method of manufacturing machine
US20180036857A1 (en) * 2016-02-17 2018-02-08 Nsk Ltd. Grinding apparatus, method of manufacturing rolling bearing, method of manufacturing vehicle and method of manufacturing machine
CN108698187A (zh) * 2016-02-17 2018-10-23 日本精工株式会社 磨削装置
US11534884B2 (en) 2016-02-17 2022-12-27 Nsk Ltd. Method of manufacturing rolling bearing, method of manufacturing vehicle and method of manufacturing machine
CN112975656A (zh) * 2021-01-29 2021-06-18 浙江伯特利科技股份有限公司 一种平板闸阀阀体加工用研磨装置及加工工艺
CN112975656B (zh) * 2021-01-29 2022-06-03 浙江伯特利科技股份有限公司 一种平板闸阀阀体加工用研磨装置及加工工艺
CN113231927A (zh) * 2021-05-19 2021-08-10 成都宏明双新科技股份有限公司 一种打磨异形零件的方法
CN113245895A (zh) * 2021-05-20 2021-08-13 张洪刚 一种多轴加工用自动防止碎屑飞溅划伤工件的智能化装置
CN114147553A (zh) * 2021-11-12 2022-03-08 安徽亚珠金刚石股份有限公司 一种用于人造金刚石制品表面精细打磨设备
CN116787275A (zh) * 2023-08-08 2023-09-22 临清市康氏轴承有限公司 一种推力滚子轴承精加工装置
CN116787275B (zh) * 2023-08-08 2024-01-30 临清市康氏轴承有限公司 一种推力滚子轴承精加工装置
CN118752328A (zh) * 2024-09-05 2024-10-11 江苏海泰光电材料科技股份有限公司 一种高纯铝平面靶材磨削加工装置

Also Published As

Publication number Publication date
DE1752684B1 (de) 1971-07-15
CH482504A (de) 1969-12-15
GB1238967A (enExample) 1971-07-14

Similar Documents

Publication Publication Date Title
US3594953A (en) Cooling arrangement for thread-grinding machines
US3066578A (en) Temperature control of machine tool
US2068084A (en) Drilling and tapping machine
US3303731A (en) Temperature controlled lathe
US2759378A (en) Machine-tool
CN111113143B (zh) 冷却系统、电主轴及数控机床
US2639562A (en) Precision locating device
US2150749A (en) Feed mechanism
GB1281939A (en) Method and apparatus for positional control compensation for temperature changes in machine tool spindles
US3240541A (en) Temperature controlled hydrostatic spindle bearing
US2335356A (en) Grinding machine
US2335100A (en) Machine tool coolant temperature control
US1961849A (en) Grinding machine
US2059505A (en) Automatic pattern controlled reproducing machine
US2436406A (en) Hydraulic transmission for machine tools
US2380747A (en) Machine tool
US2597242A (en) Centerless grinding machine
GB1323893A (en) Bearing and spindle assembly
US2372426A (en) Duplicator for machine tools
US2861399A (en) Feed control mechanism
US2313479A (en) Feed mechanism
US2070811A (en) Thermally conditioned machine tool
GB1034961A (en) Cooling means for guideways of machine tools
US2008012A (en) Fluid pressure operated machine tool
JPH0335060B2 (enExample)