Thielenhaus Technologies GmbH

Germany

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Date
2024 November 1
2024 1
2023 1
2020 1
Before 2020 16
IPC Class
B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency 9
B24B 21/02 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces 5
B24B 21/16 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape 3
B24B 27/00 - Other grinding machines or devices 3
B23Q 39/04 - Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation the sub-assemblies being arranged to operate simultaneously at different stations, e.g. with an annular work-table moved in steps 2
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NICE Class
07 - Machines and machine tools 5
40 - Treatment of materials; recycling, air and water treatment, 1
Status
Pending 2
Registered / In Force 17

1.

PowerGrind

      
Application Number 019105177
Status Pending
Filing Date 2024-11-13
Owner Thielenhaus Technologies GmbH (Germany)
NICE Classes  ?
  • 07 - Machines and machine tools
  • 40 - Treatment of materials; recycling, air and water treatment,

Goods & Services

Maschinen und Werkzeugmaschinen für Materialbearbeitung und Produktion, Schneide-, Bohr-, Schleif-, Schärf- und Oberflächenbehandlungsmaschinen und -apparate, insbesondere Honmaschinen für gewerbliche Zwecke, Honmaschinen für die Metallbearbeitung, Schleifmaschinen zum Bearbeiten von Bremsscheiben, Schleifscheiben für Schleifmaschinen, sowie Teile und Ersatzteile für die vorgenannten Waren. Materialbearbeitung und -umwandlung, Oberflächenbearbeitung insbesondere von Metallgegenständen, Oberflächenbearbeitung von Bremsscheiben.

2.

METHOD AND DEVICE FOR PROCESSING A HARD-COATED WORKPIECE SURFACE OF A ROTATIONALLY SYMMETRICAL WORKPIECE

      
Application Number 17944126
Status Pending
Filing Date 2022-09-13
First Publication Date 2023-03-16
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor
  • Goeke, Sebastian
  • Schumann, Sebastian
  • Lupp, Martin
  • Schmitz, Thomas

Abstract

The present invention relates to a method and a device for processing a hard-coated workpiece surface of a rotationally symmetrical workpiece (1) with at least one grinding wheel, wherein the method comprises the following steps: driving the workpiece (1) into a rotational motion around a workpiece axis of rotation (1.1), driving a grinding wheel (2a) into a rotational motion around a grinding wheel axis of rotation (2a.1), angulating the grinding wheel axis of rotation (2a.1) and the workpiece axis of rotation (1.1) to each other so that the grinding wheel axis of rotation (2a.1) and the workpiece axis of rotation (1.1) are not parallel, processing the workpiece surface with the grinding wheel (2a), wherein the grinding wheel (2a) is in contact with the workpiece surface.

IPC Classes  ?

  • B24B 5/01 - Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor for combined grinding of surfaces of revolution and of adjacent plane surfaces on work
  • B24B 27/00 - Other grinding machines or devices

3.

MACHINE TOOL HAVING A LOADING DEVICE

      
Application Number EP2020052008
Publication Number 2020/157047
Status In Force
Filing Date 2020-01-28
Publication Date 2020-08-06
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Schwär, Rudolf

Abstract

The present invention relates to a machine tool for machining surfaces of in particular rotation-symmetrical workpieces (7), comprising at least one machining station (1, 2), at least one loading station (3) and/or unloading station (4) for the workpieces to be machined and/or for the machined workpieces and a loading device (6) for transferring the workpieces (7) from one station (1, 2, 3, 4) to an adjacent station (1, 2, 3, 4), characterized in that the loading device (6) comprises a rotatably driven pushing device (8), a drive (9) for the pushing device (8) and a rotatably mounted and braked guide device (10), wherein, by driving the pushing device (8), a workpiece (7) is first pushed by the pushing device (8) against the guide device (10) and then the workpiece (7), in contact with the pushing device (8) and in contact with the braked guide device (10), which is moved indirectly by the pushing device (8), is transferred on a circular arc track from one station (1, 2, 3, 4) to an adjacent station (1, 2, 3, 4).

IPC Classes  ?

  • B23Q 7/02 - Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of drums or rotating tables or discs
  • B23Q 7/04 - Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of grippers
  • B65G 47/86 - Star-shaped wheels or devices having endless travelling belts or chains, the wheels or devices being equipped with article-engaging elements the article-engaging elements being grippers

4.

PRESSING-ON SHOE

      
Application Number EP2018083723
Publication Number 2019/115323
Status In Force
Filing Date 2018-12-06
Publication Date 2019-06-20
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor
  • Schmitz, Thomas
  • Laubl, Dieter

Abstract

The present invention relates to a pressing-on shoe (1) for pressing a finishing belt onto surfaces of a rotating workpiece, comprising - a carrier (2), - a radial pressing-on face (3) for pressing a finishing belt onto a circumferential face of the workpiece, and - axial pressing-on faces (4) for pressing the finishing belt onto axially oriented cheek faces of the workpiece that delimit the circumferential face, wherein at least one axial pressing-on face (4) is formed by at least one axial pressing-on element (5), and the at least one axial pressing-on element (5) is movable at least in certain portions relative to the carrier (2) at least in the axial direction (9).

IPC Classes  ?

  • B24B 21/02 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
  • B24B 5/42 - Single-purpose machines or devices for grinding crankshafts or crankpins

5.

DEVICE FOR FINISHING A WORKPIECE USING A FINISHING BELT, AND METHOD FOR OPERATING A CORRESPONDING DEVICE

      
Application Number EP2018074750
Publication Number 2019/053128
Status In Force
Filing Date 2018-09-13
Publication Date 2019-03-21
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Gössl, Thomas

Abstract

The invention relates to a device (1) for machining a workpiece using a belt (2), comprising a belt reel holder (4) for holding a reel (3) through which the belt (2) is supplied, a housing (5) which delimits a machining chamber (10), a workpiece holder disposed in the machining chamber (10), and a pressing arrangement (6) disposed in said machining chamber (10) for pressing the belt (2) onto the workpiece, characterised in that the belt reel holder (4) is located outside the housing (5) that delimits the machining chamber (10).

IPC Classes  ?

  • B24B 21/02 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
  • B24B 21/16 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape
  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
  • B24B 19/12 - Single purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
  • B24B 49/12 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means

6.

CYCLE DISK FOR A MACHINE TOOL AND MACHINE TOOL

      
Application Number EP2018068473
Publication Number 2019/016005
Status In Force
Filing Date 2018-07-09
Publication Date 2019-01-24
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Hesse, Siegfried

Abstract

The invention relates to a machine tool (1) for machining workpieces (5), comprising a loading station (12) and/or an unloading station (13), at least one machining station (14), and a cycle disk (1) for feeding the workpieces (5) to the stations (12, 13, 14), wherein the cycle disk (1) has a transport disk (3) having at least two cut-outs (4) for one workpiece (5) each, the machine tool being characterized in that each cut-out (4) is assigned at least two centering shoes (6), which are fastened to the transport disk (3) at an offset to each other in the peripheral direction of the cut-out and which protrude radially inward beyond an outer contour (7) of the cut-out (4) in order to support the workpiece (5).

IPC Classes  ?

  • B23Q 3/06 - Work-clamping means
  • B23Q 7/02 - Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of drums or rotating tables or discs
  • B23Q 39/04 - Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation the sub-assemblies being arranged to operate simultaneously at different stations, e.g. with an annular work-table moved in steps

7.

Device for producing a curved surface

      
Application Number 15261568
Grant Number 10040162
Status In Force
Filing Date 2016-09-09
First Publication Date 2018-03-15
Grant Date 2018-08-07
Owner Thielenhaus Technologies GmbH (Germany)
Inventor
  • Thielenhaus, Johann Peter
  • Dinardi, Pete
  • Fink, Klaus-Peter

Abstract

A device for producing a curved surface (2) of a work piece (1) includes a tool (3) and a tool holder for receiving the tool (3), the tool holder being drivable for rotation about a tool axis (4). At least one work piece holder accommodates a work piece (1). The work piece holder is drivable for rotation about a work piece axis (5). The tool axis (4) and the work piece axis (5) are positionable at an angle relative to one another. The tool axis (4) and the work piece axis (5) are positionable at an angle relative to one another. A work piece holder support (6) receives a plurality of work piece holders, the work piece holders being rotatably drivable relative to the work piece holder support (6). The work piece holder support (6) is rotatably drivable about a work piece holder support axis (7), so that based on superposed rotations of work piece holders and work piece holder support (6) and the rotating tool, the surface (2) of each work piece (1) is curved after end machining, depending on an inclination angle.

IPC Classes  ?

  • B24B 19/26 - Single purpose machines or devices for particular grinding operations not covered by any other main group for grinding workpieces with arcuate surfaces, e.g. parts of car bodies, bumpers or magnetic recording heads
  • B24B 27/00 - Other grinding machines or devices

8.

MACHINE HAVING A CLEANING DEVICE AN OPTICAL MEASURING DEVICE

      
Application Number EP2017072350
Publication Number 2018/046543
Status In Force
Filing Date 2017-09-06
Publication Date 2018-03-15
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Schmitz, Thomas

Abstract

The present invention relates to a machine for processing workpieces, having at least three stations and having a movably mounted table (1), wherein at least one clamping apparatus (2), which, in particular, is driveable in a rotating fashion on the table, is arranged for clamping a workpiece and the clamped workpieces are transportable into the working regions of the stations by a movement of the table, wherein a first station (3) is configured as a processing station for processing a surface of the workpiece, in which a workpiece holder (4) that holds the workpiece for processing purposes is arranged, in particular in a manner that is driveable in a rotating fashion, wherein the workpiece holder (4) is deliverable to the workpiece by means of a delivery unit (5) and alignably mounted in relation to the workpiece holder by means of an alignment unit (6), characterized in that a second station (7) has a cleaning device (8) for removing coolant and/or lubricant remains from the processed surface and in that a third station (9) has a measuring device (10) for optically determining at least one surface property of the finished and cleaned surface of the workpiece, wherein the measuring device (10) is connected to an evaluation unit which evaluates the optically determined surface property and, on the basis of the evaluation, determines the measure by which the alignment of the workpiece holder (4) must be readjusted by means of the alignment unit (6) so that tolerance targets are observed.

IPC Classes  ?

  • B24B 27/00 - Other grinding machines or devices
  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
  • B24B 49/12 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means
  • B23Q 39/04 - Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation the sub-assemblies being arranged to operate simultaneously at different stations, e.g. with an annular work-table moved in steps
  • B23Q 11/00 - 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
  • B24B 33/06 - Honing machines or devices; Accessories therefor with controlling or gauging equipment
  • B24B 49/02 - Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
  • B24B 51/00 - Arrangements for automatic control of a series of individual steps in grinding a workpiece
  • B23Q 17/22 - Arrangements for indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work

9.

Pressing device having a toothed belt

      
Application Number 15312625
Grant Number 10252394
Status In Force
Filing Date 2015-05-20
First Publication Date 2017-03-30
Grant Date 2019-04-09
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Steinwender, Holger

Abstract

A pressing device (1) for pressing finishing tape against circumferential surfaces (2) of substantially cylindrical work piece sections (3) in a finishing process includes at least one elastically bendable pressing element (5) that is substantially inelastic in the longitudinal direction. A support element (6) has two bearings (7), which are arranged at a distance from each other. The pressing element (5) is fastened to the two bearings, and the two bearings are arranged in such a manner that finishing tape is pressed against a circumferential surface (2) by the pressing element (5) across a contact angle (4) using a pressing force. The pressing device (1) is adjustable in order to process work piece sections (3) of different diameters. The pressing element may be a toothed belt (5) having tooth-like ribs (8), and the toothed belt (5) is interlockingly mounted in the support element (6) using the tooth-like ribs (8).

IPC Classes  ?

  • B24B 21/02 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
  • B24B 21/16 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape
  • B24B 21/20 - Accessories for controlling or adjusting the tracking or the tension of the grinding belt
  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

10.

PRESSURE SHOE COMPRISING AN EXPANSION CHAMBER

      
Application Number EP2016066123
Publication Number 2017/009169
Status In Force
Filing Date 2016-07-07
Publication Date 2017-01-19
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Steinwender, Holger

Abstract

The present invention relates to a pressure shoe (1) comprising a pressure surface (2) for directly pressing finishing tapes onto a radial circumferential surface (3) of a rotating workpiece section (4) during a finishing process, wherein multiple expansion elements (5) are formed in the pressure shoe (1), characterized in that the multiple expansion elements (5) are each radially expandable - individually and independently from one another - via deformation of the pressure surface (2) in the direction of the circumferential surface (3) of the workpiece section (4), such that, during the finishing process, the shape of the circumferential surface (3) of the workpiece section can be influenced in a targeted way by different expansions of the expansion elements (5) distributed over the pressure surface (2).

IPC Classes  ?

  • B24B 21/02 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
  • B24B 21/16 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape
  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

11.

Method for producing grooves on a camshaft

      
Application Number 14946102
Grant Number 09862069
Status In Force
Filing Date 2015-11-19
First Publication Date 2016-06-02
Grant Date 2018-01-09
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Schmitz, Thomas

Abstract

In a method for end processing a surface of a shaft-like workpiece, the following steps are performed in the following series, and the workpiece rotates about an axis of rotation: a) finishing the surface with a first finishing tool, c) machining the surface with the first finishing tool or a second finishing tool.

IPC Classes  ?

  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
  • B24B 19/12 - Single purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or camshafts
  • B24B 21/00 - Machines or devices using grinding or polishing belts; Accessories therefor

12.

PRESSING DEVICE HAVING A TOOTHED BELT

      
Application Number EP2015061148
Publication Number 2015/177230
Status In Force
Filing Date 2015-05-20
Publication Date 2015-11-26
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor Steinwender, Holger

Abstract

The invention relates to a pressing device (1) for pressing finishing tapes against circumferential surfaces (2) of substantially cylindrical work piece sections (3) in a finishing process, said pressing device (1) comprising at least one flexurally elastic pressing element (5) which is substantially inelastic in the longitudinal direction, and which is attached to two bearings (7) of a support element (6) arranged at a distance to one another, said pressing element being attached in such a way that the finishing tape is pressed against a circumferential surface (2) by the pressing element (5) at a pressure angle (4), using a pressing force, and the pressing device (1) can be adjusted in order to process work piece sections (3) of different diameters, characterised in that the pressing element is a toothed belt (5) which has tooth-like ribs (8), and which is interlockingly mounted in the support element (6) using the tooth-like ribs (8).

IPC Classes  ?

  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

13.

METHOD FOR OPERATING A DEVICE FOR THE MECHANICAL FINISHING OF CIRCUMFERENTIAL SURFACES ON WORKPIECES

      
Application Number EP2014069630
Publication Number 2015/036594
Status In Force
Filing Date 2014-09-15
Publication Date 2015-03-19
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor
  • Hesse, Siegfried
  • Schmitz, Thomas
  • Mores, Sascha Boris

Abstract

The invention relates to a method for operating a device (1) for the mechanical finishing of circumferential surfaces (2) on workpieces (3), comprising at least the following steps: - driving the workpiece (3) in a rotary movement, - placing a tool (7) having a geometrically undefined cutting edge on the circumferential surface (2) to be machined of the workpiece (3), - driving the tool (7) such that the tool (7) executes an oscillating movement (10) transversely to the rotary movement on the circumferential surface (2), said oscillating movement (10) serving to remove material, characterized in that the oscillating movement (10) is generated by superposition of a low-frequency double stroke (11) and a high-frequency double stroke (12) and the high-frequency double stroke (12) has a frequency of at least 45 Hz.

IPC Classes  ?

  • B24B 19/06 - 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 grinding races, e.g. roller races
  • B24B 21/02 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency

14.

Hyperfinish

      
Application Number 1236624
Status Registered
Filing Date 2014-12-18
Registration Date 2014-12-18
Owner Thielenhaus Technologies GmbH (Germany)
NICE Classes  ? 07 - Machines and machine tools

Goods & Services

Machine tools, in particular grinding machines.

15.

HYPERFINISH

      
Serial Number 79160830
Status Registered
Filing Date 2014-12-18
Registration Date 2015-07-28
Owner Thielenhaus Technologies GmbH (Germany)
NICE Classes  ? 07 - Machines and machine tools

Goods & Services

Machine tools, in particular grinding machines

16.

Hypermotion

      
Application Number 013040911
Status Registered
Filing Date 2014-06-30
Registration Date 2014-11-20
Owner Thielenhaus Technologies GmbH (Germany)
NICE Classes  ? 07 - Machines and machine tools

Goods & Services

Machine tools, In particular grinding machines.

17.

Hyperfinish

      
Application Number 013041256
Status Registered
Filing Date 2014-06-30
Registration Date 2014-11-20
Owner Thielenhaus Technologies GmbH (Germany)
NICE Classes  ? 07 - Machines and machine tools

Goods & Services

Machine tools, In particular grinding machines.

18.

METHOD AND DEVICE FOR THE MICROFINISH MACHINING OF ROTATIONALLY SYMMETRICAL WORKPIECES IN A CONTINUOUS THROUGH-FLOW METHOD

      
Application Number EP2013051419
Publication Number 2013/110746
Status In Force
Filing Date 2013-01-25
Publication Date 2013-08-01
Owner THIELENHAUS TECHNOLOGIES GMBH (Germany)
Inventor
  • Schmitz, Thomas
  • Hesse, Siegfried

Abstract

The invention relates to a method for carrying out microfinish machining of at least one end side (26) of rotationally symmetrical workpieces (25) in a continuous flow of the workpieces (25) through a machining station (10), wherein the individual workpieces (25) are acted upon in the machining station (10) on opposite sides of their circumference by two conveying means (11, 12) that are moved in opposite directions to one another, and are set in rotation with respect to one another by the relative speed of the conveying means (11, 12) and are also, during the rotation, moved in the through-flow direction (arrow 13) through the machining station (10) by drivers (28) that are fitted on one of the conveying means and surround the workpieces (25) individually, wherein the end sides (26) of the rotating workpieces (25), as they flow through, slide along against a material web (18) that is brought into abutment with the end sides (26) and serves for microfinish machining.

IPC Classes  ?

  • B24B 21/00 - Machines or devices using grinding or polishing belts; Accessories therefor
  • B24B 21/12 - Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
  • B24B 41/00 - Component parts of grinding machines or devices, such as frames, beds, carriages or headstocks
  • B24B 7/16 - Single-purpose machines or devices for grinding end faces, e.g. of gauges, rollers, nuts or piston rings
  • B24B 7/17 - Single-purpose machines or devices for grinding end faces, e.g. of gauges, rollers, nuts or piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

19.

Method and apparatus for finish machining ball tracks in a nut of a ball drive

      
Application Number 13109117
Grant Number 08647175
Status In Force
Filing Date 2011-05-17
First Publication Date 2011-11-24
Grant Date 2014-02-11
Owner Thielenhaus Technologies GmbH (Germany)
Inventor
  • Schmitz, Thomas
  • Hesse, Siegfried
  • Koerner, Hans-Joachim

Abstract

A radially inwardly open raceway formed in a nut centered on a nut axis is machined by of oscillating the nut about the nut axis while pressing a tool secured in a holder radially outwardly into the raceway of the nut. The holder is moved parallel to the nut axis and oscillated about a tool axis perpendicular to the nut axis synchronously with the oscillation of the nut about the nut axis. Springs brace the tool against the holder parallel to the nut axis such that the tool can move limitedly in the holder against spring bias parallel to the tool axis.

IPC Classes  ?

  • B24B 35/00 - Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
  • B24B 19/06 - 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 grinding races, e.g. roller races