US2930169A - Device for balancing grinding wheels during their rotation - Google Patents

Device for balancing grinding wheels during their rotation Download PDF

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Publication number
US2930169A
US2930169A US731817A US73181758A US2930169A US 2930169 A US2930169 A US 2930169A US 731817 A US731817 A US 731817A US 73181758 A US73181758 A US 73181758A US 2930169 A US2930169 A US 2930169A
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United States
Prior art keywords
spindle
axis
gravity
center
balancing
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Expired - Lifetime
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US731817A
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English (en)
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Mohrenstein Alexander
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Individual
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/30—Compensating imbalance
    • G01M1/36—Compensating imbalance by adjusting position of masses built-in the body to be tested
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/042—Balancing mechanisms
    • 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/02—Details of balancing machines or devices
    • G01M1/04—Adaptation of bearing support assemblies for receiving the body to be tested

Definitions

  • a balance weight is arranged within the hollow spindlewith its centre of gravity lying in the axis of the spindle-and is adapted to move in two directions perpendicular to each other and to the spindle axis, and furthermore, outside the spindle, two fixed adjusting members are provided, lying in the direction of the spindle axis and axially adjustable, and said adjusting members are connected independently of each other, by means of intermediate members which rotate with the spindle, to
  • Figure 2 is the longitudinal section through the lefthand end of said grinding spindle
  • Figure 6 is a resonator for measuring'the degree of balance, partly in section,
  • Figure 7 a longitudinal section through a grinding spindle with grinding wheel and balancing device in another construction.
  • the grinding wheel shown in Figure 1 consists of a grinding ring 2 carried by the two discs 1.
  • This grinding-wheel is mounted on a grinding spindle 3, which is made hollow for receiving a balancing device.
  • a balance weight 4 Arranged within this spindle is a balance weight 4, which consists for-example of hard lead and normally lies with its centre of gravity S in the spindle axis.
  • This balance weight 4 is furthermore adapted to move in two directions perpendicular to each other and to the spindle axis.
  • a bearing disc 6 fixed in the hollow spindle by means of screws 5 is a bearing disc 6, on the central bearing position 7 of which is supported a swivel ball 8.
  • This swivel ball is mounted on a shaft 9, which is secured to the balance weight 4 by means of a nut 10. Furthermore, slidably -.mounted in the bearing disc 6 and offset at a right-angle to each other are two thrust pins 11 and 12 lying parallel 2 to the spindle axis. These thrust pins 11 and 12 engage at the right-hand end radial slots 13 of the balance weight 4 and bear against the latter. Furthermore, diametrically opposite the thrust pins Hand 12 are pressure springs 14 and 15 arranged between bearing disc 6 and balance weight 4. The pressure springs 14 and 15, formed for example as plate springs, are each mounted on a shaft 16.
  • the plate springs which, on the one hand bear via a ring a 17 against the balance weight 4, press on the other hand the shaft 16 against a ball 18 arranged in a bore inthe bearing disc 6.
  • the pressure springs 14 and 15 respectively, thus constantly press the balance weight 4, which can swivel about the ball joint 8, against the thrust pin 11 or 12.
  • the adjusting members are provided in the form of concentric adjusting screws 19 and 20, adapted to be screwed by means of the discs 21 and 22 independently of each other in a stationary housing part 23.
  • the hollow adjusting screw 20 presses on a tubular intermediate member 24, whilst the pin 25 of thescrew 19 projecting through the hollow screwZll moves a rod-formed intermediate member 26.
  • Said intermediate members 24and26 bear with the interposition of axial bearings, preferably shoulder ball bearing 27 and27', against a thrust sleeve 29 and a thrust cylinder 28, re spectively, the latter being surrounded by the sleeve 29.
  • the two parts 23 and 29 rotate with the spindle 3 and are axially slidable in the latter.
  • the thrust cylinder 28 and thrust sleeve 29 bear with their right-hand end faces respectively against the thrust pins 12 and 11.
  • the axial movement of the adjusting screws 19 and 20, which are preferably provided with fine screwthreads is trans-. mitted to the balance weight 4.
  • the thrust pin 11 will be shifted in the same direction, and hence the balance weight 4 will be swung'down in the plane of the drawing about the ball joint 8, the centre of gravity will therefore be displaced downward somewhat.
  • the thrust pin 12 will be moved in the same direction, and hence the balance weight 4 will be moved about the joint Sin a plane perpendicular to the plane of the drawing.
  • the balancing device described in the foregoing thus enables in a very simple manner complete static balancing of a grinding wheel to be efiected during its rotation.
  • a resonator is used, which is mounted on the grinding machine in very close proximity to the grinding wheel, and the frequency of which corresponds to the spindle speed.
  • the balancing device according to the invention can if desired also be constructed in accordance with Figure 7.
  • the balance weight 4 is in one piece, according to Figure 7, the balance weight may be divided into two cylindrical parts 39 and 40, adapted to slide radially in two radial bores 41 and 42 of the grinding wheel spindle 43, said bores being oifset relatively to each other at a right angle.
  • each adjusting member 44 and 45 is connected via intermediate members with only one cylinder part 40 and 39, respectively.
  • a bell crank 47 is pivoted at 46 in each balance weight 39 and 40 respectively, one arm of which bell crank is supported by means of a ball joint 48 in a transverse bore 49 of the spindle 43, whilst an axially slidable thrust sleeve 51 acts upon the other arm 50 of the bell crank.
  • the adjusting nut 45 mounted stationary or screwable in the housing part 52 acts on the thrust sleeve 51 via an axial ball bearing 53.
  • the other balance weight 40 is shifted radially in its bore 42, by means of the adjusting screw 44 adapted to be screwed in a stationary bearing bracket 54.
  • Said adjusting screw 44 acts through the medium of a hard steel block 55, slidable in the nut 45, on the tip of a steel pin 56, axially slidable in the sleeve 51, which pin bears against the lever arm 50 of the bell crank 47 pivoted in the cylinder part 40.
  • 2 denotes the grinding wheel and 57 and 58 the grinding wheel guard.
  • the grinding wheel 1, 2 is prevented from rotating relaouter side 61 of which is cylindrical and the inner side 62 is spherical.
  • Axially slidable on the tapered spindle end 3a are the thrust segments 59, which internally at 63 are correspondingly tapered and externally at 64 are correspondingly spherical.
  • a nut 65 adapted to be screwed on the spindle end 3a is provided and engages by means of a collar 66 in a corresponding annular groove 67 in the thrust segments 59.
  • This nut 65 thus permits axial displacement of the thrust segments 59 in both directions.
  • the thrust segments 59 are prevented from rotating on the spindle 3 by means of keys 68.
  • the segments 59, 60 are prevented from mutual rotation by means of pins 69.
  • the nut 65 is slackened so that the then rotating grinding wheel can adjust itself (wobble) freely on the spherical segments 59, 60. Its unbalance moment with respect to the plane V--V in Figure 1, which passes through the spherical centre S, will then be equal to zero.
  • the nut 65 is then slowly tightened with the spindle running, this being best done by lightly tapping the edge of nut 65 with a rubber hammer. After stopping of the spindle, the nut 65 can be tightened fast with a spanner.
  • Device for balancing a grinding wheel during rotation comprising a frame, a hollow spindle rotatably mounted in the frame and serving for the support of a grinding wheel, a balance weight arranged within the hollow spindle and mounted for movement, from a central position in which the center of gravity of the weight lies in the spindle axis, in two directions perpendicular to each other and to the spindle axis, two adjusting members mounted on the frame and operatively connected to the balance weight by intermediate members mounted within the spindle for rotation therewith, each of said adjusting members being independently adjustable axially of the spindle to move the balance weight only in a seperate one of the two said directions; a bearing disc fixed in the hollow spindle and having a central bearing; a swivel ball rigidly connected to the balance weight and supported on said central bearing; two slidable thrust pins mounted in the bearing disc, offset at a right angle to each other and parallel to the spindle axis, the said balance weight having radi
  • Device for balancing a grinding wheel during rotation comprising a frame; a hollow spindle rotatably mounted in the frame and serving for the support of a grinding wheel; a balance weight arranged within the hollow spindle and mounted for movement from a central position in which the center of gravity of the weight lies in the spindle axis in two directions perpendicular to each other and to the spindle axis; two adjusting members mounted on the frame and operatively connected to the balance weight by intermediate mem bers mounted within the spindle for rotation therewith, each of said adjusting members being independently adjustable axially of the spindle to move the balance weight only in a separate one of the two said directions; spherical thrust segments mounted on said grinding spindle and secured against rotation relatively to said grinding spindle, said grinding wheel being mounted to swivel freely on said spherical thrust segments about the center of the grinding wheel; and an expanding and clamping device which during rotation of the grinding wheel permits radial outward pressing of the thrust segments and
  • a device for balancing a machine tool during rotation thereof comprising, in combination, a support; a hollow spindle mounted on said support for carrying said machine tool and rotatable about an axis; balancing weight means movably mounted in said spindle and having a center of gravity; first moving means for moving said weight means relative to said spindle between a position in which said center of gravity is located in a d of said spind e and a position in which said center of gravity is radially spaced from said axis in a predetermined direction; and ⁇ second movin'g means for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis and a position in which said center of gravity is radially spaced from said axis in a direction substantially perpendicular to said predetermined direction.
  • a device for balancing a machine tool during rotation thereof comprising, in combination, a support; a hollow spindle mounted on said support for carrying said machine tool and rotatable about an axis; balancing weight means movably mounted in said spindle and having a center of gravity; first moving means for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis of said spindle and a position in which said center of gravity is radially spaced from said axis in a predetermined direction; second moving means for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis and a position in which said center of gravity is radially spaced from said axis in a direct or substantially perpendicular to said predetermined direction; and actuating means mounted on said support and movable relative to said spindle for actuating said moving means.
  • a device for balancing a machine tool during rotation thereof comprising, in combination, a support; a hollow spindle mounted on said support for carrying said machine tool and rotatable about an axis; balancing weight means movably mounted in said spindle and having a center of gravity; first moving means for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis of said spindle and a position in which said center of gravity is radially spaced from said axis in a predetermined direction; second moving means for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis and a position in which said center of gravity is radially spaced from said axis in a directon substantially perpendicular to said predetermined direction; and actuating means mounted on said support substantially coaxial with said spindle and movable relative to said spindle for actuating said moving means.
  • a device for balancing a machine tool during rotation thereof comprising, in combination, a hollow spindle mounted on said support for carrying said ma chine tool and rotatable about an axis; balancing Weight means movably mounted in said spindle and having a center of gravity; first moving means mounted on said spindle and secured against rotation relative thereto for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis of said spindle and a position in which said center of gravity is radially spaced from said axis in a predetermined direction; and second moving means for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis and a position in which said center of gravity is radially spaced from said axis in a direction substantially perpendicular to said predetermined direction.
  • balancing weight means movably mounted in said spindle and having a center of gravity; first moving means mounted on said spindle and secured against rotation relative thereto for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis of said spindle and a position in which said center of gravity is radially spaced from said axis in a predetermined direction; second moving means for moving said weight means relative to sa'id spindle be;- tween a position in which said center of gravity isl located in said axis and a position in which said center of gravity is radially spaced from said axis in a direction substantially perpendicularto said predetermined direction; actuating means mounted on said support and movable relative to said spindle for actuating said moving means; and thrust bearing means havingtwo members rotatable relative to each other,one of said members being secured to said actuating
  • a device for balancing a machine tool during rota tion thereof comprising, in combination, a support; a hollow spindle mounted on said support for carrying said machine tool and rotatable about an axis; balancing weight means movably mounted in said spindle and having a center of gravity; first moving means for moving said weight means relative to said spindle between a position in which the center of gravity is located in said axis of said spindle and a position in which said center of gravity is radially spaced from said axis in a predetermined direction; second moving means for moving said weight means relative to said spindle between a position in which said center of gravity is located in said axis and a position in which said center of gravity is radially spaced from said axis in a direction substantially perpendicular to said predetermined direction; and actuating means mounted on said support and axially movable relative to said spindle for actuating said moving means.
  • second moving means for mov-' ing said weight means relative to said spindle between a position in which said center of gravity is located in said axis and a position in which said center of gravity is radially spaced from said axis in a direction substantially perpendicular to said predetermined direction; and actuating means threadedly mounted on. said support and axially movable relative to said spindle for actuating said moving means.
  • said spindle which said center of gravity is radially spaced from being formed with two radial bores ofiset at right ansaid axis in a predetermined direction; and second movgles to each other, and said balancing weights being reing means for moving the other one of said weights relspectively slidable in said bores.
  • said spindle which said center of gravity is radially spaced from being formed with two radial bores ofiset at right ansaid axis in a predetermined direction; and second movgles to each other, and said balancing weights being reing means for moving the other one of said weights relspectively slidable in said bores.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US731817A 1957-10-08 1958-04-29 Device for balancing grinding wheels during their rotation Expired - Lifetime US2930169A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM35556A DE1049264B (de) 1957-10-08 1957-10-08 Auswuchtvorrichtung fuer insbesondere mit einem Resonator ausgeruestete Schleifmaschinen

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US2930169A true US2930169A (en) 1960-03-29

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US731817A Expired - Lifetime US2930169A (en) 1957-10-08 1958-04-29 Device for balancing grinding wheels during their rotation

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US (1) US2930169A (fr)
CH (1) CH365625A (fr)
DE (1) DE1049264B (fr)
FR (1) FR1205933A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172303A (en) * 1959-10-17 1965-03-09 Fortuna Werke Spezialmaschinen Balancing apparatus
US3407545A (en) * 1964-12-11 1968-10-29 Schumag Schumacher Metallwerke Assembly for statically balancing rotary articles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1296990B (de) * 1964-12-11 1969-06-04 Schumag Schumacher Metallwerke Vorrichtung zum statischen Auswuchten von Schleifscheiben an Schleifmaschinen waehrend des Umlaufs

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2164900A (en) * 1937-08-12 1939-07-04 Cincinnati Grinders Inc Dynamic balancer for machine tools

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1332896A (en) * 1915-07-17 1920-03-09 Pittsburgh Plate Glass Co Polishing-block
FR492133A (fr) * 1917-09-27 1919-06-28 Norton Co Perfectionnements aux dispositifs de meulage
US1580129A (en) * 1923-06-16 1926-04-13 Pittsburgh Plate Glass Co Polishing runner
US1679201A (en) * 1923-11-16 1928-07-31 American Optical Corp Universal stone mounting
GB438854A (en) * 1935-05-09 1935-11-25 Booth Walters Improvements in or relating to grinding or abrading machines
US2142021A (en) * 1937-09-03 1938-12-27 Cincinnati Grinders Inc Automatic dynamic balancer for machine tools
US2574025A (en) * 1947-05-27 1951-11-06 John R Rule Angularly adjustable circular saw mounting
US2781617A (en) * 1955-05-27 1957-02-19 Jerry J Lines Swivel sander

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2164900A (en) * 1937-08-12 1939-07-04 Cincinnati Grinders Inc Dynamic balancer for machine tools

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172303A (en) * 1959-10-17 1965-03-09 Fortuna Werke Spezialmaschinen Balancing apparatus
US3407545A (en) * 1964-12-11 1968-10-29 Schumag Schumacher Metallwerke Assembly for statically balancing rotary articles

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Publication number Publication date
DE1049264B (de) 1959-01-22
CH365625A (de) 1962-11-15
FR1205933A (fr) 1960-02-05

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