US2528621A - Grinding wheel truing apparatus - Google Patents

Grinding wheel truing apparatus Download PDF

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Publication number
US2528621A
US2528621A US760366A US76036647A US2528621A US 2528621 A US2528621 A US 2528621A US 760366 A US760366 A US 760366A US 76036647 A US76036647 A US 76036647A US 2528621 A US2528621 A US 2528621A
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United States
Prior art keywords
wheel
truing
grinding wheel
spindle
diamond
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
US760366A
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English (en)
Inventor
Chauncey E Sweetser
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.)
Saint Gobain Abrasives Inc
Original Assignee
Norton Co
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Filing date
Publication date
Priority to FR963809D priority Critical patent/FR963809A/fr
Application filed by Norton Co filed Critical Norton Co
Priority to US760366A priority patent/US2528621A/en
Application granted granted Critical
Publication of US2528621A publication Critical patent/US2528621A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/12—Dressing tools; Holders therefor
    • B24B53/14—Dressing tools equipped with rotary rollers or cutters; Holders therefor

Definitions

  • the invention relates to apparatus for truing grinding wheels, especially for truing diamond grinding wheels and of these especially for truing diamond grinding wheels bonded with the harder bonds such as with metal bond or vitrified ceramic bond.
  • One object of the invention is to provide a simple and dependable apparatus which can be used on a wide variety of grinders for truing the grinding wheel thereof. Another object is to provide a truing tool for diamond grinding wheels which will shape them accurately. I Another object is to provide a tocl of the character indicated which is capable of truing the hardest of grinding Wheels. Another object of the invention is to provide a truing tool of the character indicated whose wearable part is relatively inexpensive and easily replaced. Another object of the invention is to provide a rotary truing tool with an effective control to enable it to perform a. truing operation on very hard grinding wheels accurately. Another object of the invention is to provide a truing tool to true grinding wheels, especially diamond grinding wheels, which is resistant to wear.
  • Figure 1 is an end elevation of truing apparatus constructed in accordance with the invention
  • Figure 2 is a plan View of the apparatus of Figure 1
  • Figure 3 is a view, partly in side elevation and partly in axial section, of the apparatus
  • Figure 4 is a cross-sectional view taken on the line 4-4 of Figure 3.
  • the apparatus has a, base II] which is shown as a fiat piece of metal, rectangular in plan, and which has slots II, one on each side, whereby the base II] can be clamped to the table or other part of the grinder, as by means of bolts not shown.
  • the base I is integral with an upstanding housing l2 which has at one end a flange I3.
  • the base I0;-the housing I2 and the flange I3 may be one piece of metal, for example a piece of cast iron.
  • the housing I2 is bored all the way through to form a series of coaxial bores the axis of which 2 is parallel to the bottom of the base I0; As shown in Figure 3 and working from left to right there is first an integral inwardly extending flange I4, then along bore I5 next internal screw threads l6, then a bore I! of larger diameter than that of the bore I5 and finally a bore IB of larger diameter than the bore II.
  • the flange I4 In'contactwith the flange I4 is the outer race I9 of a ball bearing 20 which race is pressed against the flange I4 by a sleeve 2
  • a spring 23 which at the left hand end engages a washer 24 in contact with the ring nut 22 and which spring 23 at the right hand end engages a sleeve 25 inthe bore I8, the right hand end of the sleeve 25 being cut away to receive the outer race26 of a ball bearing 21.
  • the sleeve 25 is slidable in the bore I8 but is prevented from turning therein by means of a pin 28 through the housing I2 which pin 28 engages a slot 29 in the sleeve 25.
  • the ball bearing 20 has an inner race 30 which nicely fits a long cylindrical portion 3
  • the left hand side of the race 30 is in engagement with a flange 33 of the spindle 32, while the right hand side ofthe race 30 is engaged by a long sleeve 34 fitting the cylindrical portion 3
  • and engaging the right hand end of the long sleeve 34 is the inner race 35 of the ball bearingf21.
  • a nut 36 screwed onto a threaded'portion 3'! of the spindle 32 engages the inner race 35 and by tightening the nut 36 the two races 30 and 35are held tightly on the spindle 32 in fixed spaced relationship.
  • an oiling plug 38 screwed into the housing l2 and extending into the bore IT.
  • the washer 24 slightly clears the sleeve 34 to allow the oil to work to the left while the clearance between the sleeve 25 and the sleeve 34 will allow the grease to work to the right.
  • a felt washer, or the like, 39 is located between the flange l4 and the flange 33 to keep the oil from coming out of the bore in the housing I2.
  • a larger flange 49 Adjacent the flange 33 on the spindle 32 is a larger flange 49 which serves to hold the Washer 39 in place and also positions a grinding wheel 4
  • the left hand end of the spindle 32 has a screw threaded portion 44 on which may be mounted'a nut 45 engaging a washer 46 to clamp the grinding wheel 4
  • the spindle 32 has a tapered portion50 on which fits a cylindrical metal member 5 having a tapered hole 52 to fit the tapered portion 50.
  • the cylindrical member 5! is rigidly held on'the spindle 32 by means of. a nut 53 onthe threaded end portion 54 of the spindle 32, the'nut 53 en--' gaging a washer 55 which is-in engagement with the side of the cylindricalmetal member 5
  • a plurality of. threaded bores 56' are formed in the cylindrical member 5
  • In the cut-outs 58 are shoes 59 whose. exterior surfaces are cylindrical segments forming a continuation of the cylindrical exterior surface of the member 5
  • the shoes 59 have cylindrical-extensionsfifl which fit in the bores 51.
  • Countersunk in the shoes 59 and inthe cylindrical extensions 30 are cylindrical holes 6
  • When. the grinding wheel 4
  • the shoes 59 which are preferably made of metal, have. a certain mass and preferably they'all have the same mass. Centrifugal force actsradially outward on the shoes- 59 slightly, whereupon the spring tension will automatically increase...
  • I provide a cylindrical internalv brake surface- B5 which. may be the interior of a cap 66 fitting over the cylindrical end 61 of the housing. 2 and. resting against the flange 3 and being secured in place by screws 68.
  • Increase of angular velocity after the shoes 59 have started to move will finally bring them into contact with the surface 65- which. will apply a 4 friction to the apparatus to prevent further increase of angular velocity.
  • the apparatus in the cap 66 is a speed governor operating on the centrifugal force-friction principle. This particular governor will control the angular velocity of the grinding wheel 4
  • the apparatus of the present invention can be used on practically any kind of grinder, such'as surface grinders, tool and cutter grinders, chip; breaker grinders, carbide toolgrinders, cylindrical grinders, centerless grinders, internal grind ers and stone cutting machinery. It issufli'cient to secure the base IE to the'appropriate part of the machine and then, using'the' precision feed; usually a cross. feed; of the machine, feed the grinding wheel of the machine into the grinding wheel 4! of this apparatus. As aforesaid it is convenient to use a magnetic chuck, if suchis' available, to hold the base l0 in position. Otherwise bolts or clamps can be used. For different kinds and sizes of machines the base lll'ma-y assume many different shapes in order to fit particular machines properly.
  • Speeds of grinding wheels are usually stated in terms of peripheral velocity rather than angular velocity, because it is the peripheral or surface velocity which determines the cutting rate.
  • for'best results shouldbe a wheel made of silicon carbide abrasive bonded. with vitrified bond.
  • other abrasives .could be used to make the wheel 4 l Ibelieve however that silicon car- 5. bide will give the best results on all kinds of diamond grinding wheels.
  • is determined by the grit size of the diamond abrasive in the wheel to be trued for the best results.
  • metal bonded and vitrified bonded diamond grinding wheels having diamonds of 220 grit size and finer I prefer to use 80 grit size silicon carbide.
  • the apparatus of the invention is useful for truing all types of metal bonded and vitrified bonded diamond grinding wheels of which I have knowledge and it is useful for truing resinoid bonded diamond grinding wheels up to 220 grit size.
  • I prefer medium structure and in most cases the grade hardness should be medium but this is dependent upon the extent of contact between the diamond wheel and the wheel 4
  • a so-called straight diamond wheel that is to say comprising a cylindrical disc grinding on the periphery, of dimensions 8" in diameter by thick, having 100 grit size diamonds bonded with vitrified bond with 25 volume per cent of diamonds, grade N, a silicon carbide wheel 4
  • a cutting-01f wheel consisting of a disc 12" in diameter and of an inch thick comprising 12 volume per cent of 80 grit size diamonds bonded with grade N metal bond
  • is traversed across the face of the grinding wheel to be trued.
  • and the diamond wheel is thus like the relative motion between a truing diamond and an ordinary grinding wheel. Since there are so many different kinds of grinders the foregoing will be made clear by reference to a surface grinder having a flat table and a grinding wheel spindle above the table parallel to it. If it is desired to true a straight cylindrical diamond wheel which grinds on the periphery on such a machine, the diamond wheel is secured to the spindle of the machine and the apparatus of this invention is secured to the table of the surface grinder with its spindle 32 parallel to and underneath the spindle which holds the diamond wheel. The down feed of the surface grinder is used to cause the wheels to approach. This is the infeed for wheel 4
  • the down feed is adjusted so that the two wheels will just make contact and then the cross feed is used'to traverse. After one or two passes the down feed may be used to cause a further infeed between thewh'eels. In using this apparatus an infeed of one thousandth of an inch is a good infeed. Lesser infeeds can be used but in most cases the infeed between successive passes should not be much greater than a thousandth of an inch.
  • the washer 39 servesto some extent to keep the abrasive dust from getting inside of the housing I2.
  • '2 can be provided.
  • Most of the operations performed so far have been done dry partly because of danger of getting lubricant loaded with 'abra-' sive into the bearings. Good results have been obtained in dry operations. However in certain cases it may be desired to use a grinding lubricant such as a soluble oil water mixture in performing the truing operation.
  • Truing apparatus for grinding wheels comprising a spindle having a portion upon which a truing grinding wheel can be mounted, a truing grinding wheel secured on said portion, said truing grinding wheel comprising crystalline abrasive in a vitrified bond, a housing, hearings in said housing journalling said spindle, a member connected to and on said spindle and mounted for rotation, brake shoes mounted on said member, springs operating against said brake shoes, and a brake drum surrounding said brake shoes 60 whereby when said truing grinding wheel is rotated by a grinding wheel to be trued the truing grinding Wheel will rotate at a predetermined rate.
  • Truing apparatus for grinding wheels comprising a spindle having a portion upon which a truing grinding wheel can be mounted, a truing grinding wheel secured on said portion, said truing grinding wheel comprising crystalline abrasive in a vitrified bond, a housing, bearings in said housing journalling said spindle, a member connected to and on said spindle and mounted for rotation, brake shoes mounted on said member, springs operating against said brake shoes, screws bearing against said springs to adjust the pressure of said springs against said brake; shoes, and a; brake drum surroundin said brake shoesv whereby: when said truinggrinding wheeltisrotated bya grinding wheel to be trued the truing grinding wheel will rotate. at a predetermined rate. a 1

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
US760366A 1947-07-11 1947-07-11 Grinding wheel truing apparatus Expired - Lifetime US2528621A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR963809D FR963809A (de) 1947-07-11
US760366A US2528621A (en) 1947-07-11 1947-07-11 Grinding wheel truing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US760366A US2528621A (en) 1947-07-11 1947-07-11 Grinding wheel truing apparatus

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US2528621A true US2528621A (en) 1950-11-07

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2664681A (en) * 1948-07-19 1954-01-05 Robert J Hood Method of dressing diamond wheels
US2735240A (en) * 1956-02-21 Grinding wheel mounting
US2775078A (en) * 1955-06-17 1956-12-25 Ncr Co Method and apparatus for forming grinding wheels
US3067732A (en) * 1958-10-29 1962-12-11 Landis Tool Co Roller-type dressers for grinding wheels
US3491741A (en) * 1967-12-26 1970-01-27 Litton Industries Inc Profile dressing mechanism for grinding wheels
US3584616A (en) * 1968-08-08 1971-06-15 Landis Tool Co Truing mechanism for grinding wheels
US4475321A (en) * 1980-09-20 1984-10-09 Ernst Winter & Sohn Gmbh & Co. Method of trueing of grinding disks
US4535571A (en) * 1981-03-30 1985-08-20 Energy-Adaptive Grinding, Inc. Grinding control methods and apparatus
EP0255267A2 (de) * 1986-08-01 1988-02-03 Unicorn Industries Plc Abrichten von Schleifscheiben
US4811721A (en) * 1987-06-22 1989-03-14 Altfather Walter R Wheel dresser
US4920945A (en) * 1987-12-23 1990-05-01 Wedeniwski Horst J Method for dressing grinding wheels

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE198363C (de) *
US574209A (en) * 1896-12-29 Governor for power-shafts
GB189825216A (en) * 1898-11-29 1899-03-04 Hermann Laucks Improved Means for Trueing-up Emery or other Grinding and Polishing Stones.
US1075227A (en) * 1910-06-30 1913-10-07 Durham Duplex Razor Company Machine for truing honing-wheels.
US1395394A (en) * 1920-10-07 1921-11-01 Prec Truing Machine And Tool C Mechanism for truing and dressing grinding-wheels
US1777607A (en) * 1929-04-09 1930-10-07 Ekholm Carl Gustav Machine for grinding bodies of revolution
US1811933A (en) * 1929-06-20 1931-06-30 Ferdinand J Hohnhorst Mechanism for truing and dressing grinding wheels
US1967447A (en) * 1932-08-25 1934-07-24 Nelson Alfred Edward Adjustable disk and tool grinder

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE198363C (de) *
US574209A (en) * 1896-12-29 Governor for power-shafts
GB189825216A (en) * 1898-11-29 1899-03-04 Hermann Laucks Improved Means for Trueing-up Emery or other Grinding and Polishing Stones.
US1075227A (en) * 1910-06-30 1913-10-07 Durham Duplex Razor Company Machine for truing honing-wheels.
US1395394A (en) * 1920-10-07 1921-11-01 Prec Truing Machine And Tool C Mechanism for truing and dressing grinding-wheels
US1777607A (en) * 1929-04-09 1930-10-07 Ekholm Carl Gustav Machine for grinding bodies of revolution
US1811933A (en) * 1929-06-20 1931-06-30 Ferdinand J Hohnhorst Mechanism for truing and dressing grinding wheels
US1967447A (en) * 1932-08-25 1934-07-24 Nelson Alfred Edward Adjustable disk and tool grinder

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735240A (en) * 1956-02-21 Grinding wheel mounting
US2664681A (en) * 1948-07-19 1954-01-05 Robert J Hood Method of dressing diamond wheels
US2775078A (en) * 1955-06-17 1956-12-25 Ncr Co Method and apparatus for forming grinding wheels
US3067732A (en) * 1958-10-29 1962-12-11 Landis Tool Co Roller-type dressers for grinding wheels
US3491741A (en) * 1967-12-26 1970-01-27 Litton Industries Inc Profile dressing mechanism for grinding wheels
US3584616A (en) * 1968-08-08 1971-06-15 Landis Tool Co Truing mechanism for grinding wheels
US4475321A (en) * 1980-09-20 1984-10-09 Ernst Winter & Sohn Gmbh & Co. Method of trueing of grinding disks
US4535571A (en) * 1981-03-30 1985-08-20 Energy-Adaptive Grinding, Inc. Grinding control methods and apparatus
EP0255267A2 (de) * 1986-08-01 1988-02-03 Unicorn Industries Plc Abrichten von Schleifscheiben
EP0255267A3 (de) * 1986-08-01 1989-03-08 Unicorn Industries Plc Abrichten von Schleifscheiben
US4811721A (en) * 1987-06-22 1989-03-14 Altfather Walter R Wheel dresser
US4920945A (en) * 1987-12-23 1990-05-01 Wedeniwski Horst J Method for dressing grinding wheels

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Publication number Publication date
FR963809A (de) 1950-07-21

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