US2600815A - Apparatus for rough and fine grinding of spherical surfaces - Google Patents

Apparatus for rough and fine grinding of spherical surfaces Download PDF

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Publication number
US2600815A
US2600815A US88624A US8862449A US2600815A US 2600815 A US2600815 A US 2600815A US 88624 A US88624 A US 88624A US 8862449 A US8862449 A US 8862449A US 2600815 A US2600815 A US 2600815A
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United States
Prior art keywords
work
ring
wheel
grinding
curvature
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Expired - Lifetime
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US88624A
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English (en)
Inventor
John R Turner
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Eastman Kodak Co
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Eastman Kodak Co
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Publication date
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Priority to US88624A priority Critical patent/US2600815A/en
Priority to FR1041560D priority patent/FR1041560A/fr
Priority to GB9739/50A priority patent/GB671766A/en
Application granted granted Critical
Publication of US2600815A publication Critical patent/US2600815A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/14—Zonally-graded wheels; Composite wheels comprising different abrasives
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
    • B24B13/023—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made for grinding several lenses simultaneously

Definitions

  • This invention relates to grinding a spherical surface on a piece of work and particularly to grinding a spherical surface on a plurality of lens blanks.
  • One object of the present invention is to provide an apparatus for rough and fine grinding a spherical surface on a piece of work which involves only a single chucking operation of the work relative to the tool, and requires but a single grinding machine and a single feeding operation of the tool, In other words, both the rough and fine grinding operations are carried out successively on a single machine with only one blocking of the work and without requiring any change of tools.
  • Another object is to provide an apparatus for rough and fine grinding a spherical surface on a plurality of lens blanks in which the two grinds are successively carried out by feeding a pair of concentrically related and rotating annular grinding surfaces. one of the coarse abrasive and the other of fine abrasive, into engagement with the surface of the work and along the axis of the grinding surfaces which is inclinedto the axis of rotation of the work as determined by the curvature of the surface to be generated.
  • a further object is to provide an apparatus for rough and fine grinding a spherical surface of the type described which is applicable to finishing both concave and convex spherical surfaces.
  • FIG. 1 is a vertical sectional view showing an apparatus for generating a spherical convex surface on a plurality of lens blanks and constructed in accordance with a preferred embodiment of the present invention
  • Fig. 2 is an enlarged sectional detail view showing the relative positions assumed by a new grinding wheel constructed in accordance with the present invention and the original surface of a piece of work to be ground;
  • Fig. 3 is a'view corresponding to Fig. 2, but showing the relative positions of the wheel surface and the work after the tool has been fed toward the work to bring its surface down to approximately the finished dimension. and showing how the outer ring of coarse abrasive fails to touch the surface when it is ground down to this radius;
  • Fig. 4 is a view corresponding to Fig. 2, but showing how only the inside edge of he fine abrasive ring on the wheel remains in engagement with the piece of work at the time its surfaceis reduced to the desired curvature;
  • Fig. 5 is an exaggerated sectional detail of a tool which has been used at least once, and showing how the surfaces of the coarse and fine abrasive rings thereof are worn to different curvatures. This tool is also shown in a position it would assume relative to the surface of a new piece of work and showing that at this time the surface of the fine abrasive ring does not contact the surface to be r
  • Fig. 6 is an enlarged sectional detail of another embodiment of grinding wheel having a. coarse abrasive ring which is much narrower than the fine abrasive ring so as to provide a wheel having a longer life;
  • Fig. 7 is a vertical sectional view showing how the present invention can be used to grind concave spherical surfaces
  • Fig. 8 is a vertical sectional view showing another embodiment of the present invention.
  • Fig. 9 is a view taken substantially on line 9--9 of Fig. 8.
  • the work to be ground is mounted on a block so as to be rotated about an axis which passes through the center of curvature of the surface or surfaces to be generated.
  • a rotating annular or cup-shaped grinding wheel having its axis of rotation inclined to the axis of rotation of the work as dictated by the curvature of the surface to be generated, is then fed along its axis into engagement with the work.
  • the invention makes use of a special form of grinding wheel employing an inner ring of bonded fine abrasive surrounded by an outer ring of bonded coarse abrasive; the diameter of the inner ring bein great enough so that its periphery embraces all of the surface to be worked.
  • the change in radius of curvature of the work is sufficient to cause such a grinding wheel to begin to grind along its outside edge and to finish grinding toward its inside edge.
  • the entire roughand finished grind of a complete block of lenses may be accomplished by a single infeed of the generating wheel and a single chucking of the block of lenses.
  • Fig. l I have shown a preferred form of apparatu for rough and fine grinding, a convex spherical surface on a plurality of lens blanks in accordance with the present invention.
  • the lens blanks II) to be worked are disposed in seats II around the convex spherical periphery of a blocking tool I2.
  • these lens blanks are initially molded, or otherwise fabricated, so that their surfaces to be generated are somewhat oversize, or are of a greater curvature than that finally desired, and they are fastened in these seats I I by pitch, with the surface to be generated extending slightly beyond the periphery of the block.
  • Fig. l I have shown a preferred form of apparatu for rough and fine grinding, a convex spherical surface on a plurality of lens blanks in accordance with the present invention.
  • the lens blanks II) to be worked are disposed in seats II around the convex spherical periphery of a blocking tool I2.
  • the generated surfaces of the blanks are shown substantially in the plane of the periphery of the block as they will be when the surfaces are finish ground to the desired curvature, and each finished curve lies on a circle whose center of curvature is at I4 in the body of the block.
  • the block of lenses is continually rotated through its spindle I5 by any suitable means, not shown, and it will be noticed that the axis of rotation of the block passes through the center of curvature I4 of the surface to be generated on the lens blanks.
  • the grinding tool is in the form of a cupshaped wheel I6 having a spindle I! which is driven by any suitable means to rotate the Wheel.
  • On the end of the grinding wheel there is fixed an outer ring I8 of bonded coarse abrasive, and an inner ring I9 of bonded fine abrasive.
  • the diameter of the wheel I6 is determined by the radius of the spherical surface to be generated, and is large enough so that the inner abrasive ring I9 will embrace the entire surface to be ground as it rotates relative to the wheel. Or, stating it another way, the diameter of the inner ring will be large enough so that its chord will include approximately half of the blocking angle of the block on which the lenses are mounted.
  • This grinding wheel is located so that its axis of rotation is inclined to the axis of rotation of the block and passes through the center of curvature I of the surface to be generated. Obviously, this angle of inclination of the grindin wheel will vary with the radius of curvature of'the particular surface to be generated. Because of their long wearing quality, rings I8 and I9 of bonded diamond dust have been found very useful in this grinding wheel. However, it will be appreciated that bonded abrasives of a character other than diamonds could be used within the spirit of the present invention.
  • any suitable means may be provided for feeding the Wheel along its axis toward the work; for example, air pressure as shown in Fig. '7 and described hereinafter.
  • the sam result could be obtained by holding the grinding wheel stationary and movin the block of lenses toward it along the wheel axis, or by moving the wheel and work toward each other at the same time, so long as their engagement is in a direction along the wheel axis. Since, at
  • the wheel spindle may have a micrometer stop arrangement associated therewith, not shown, which will automatically stop the feeding operation of the wheel when a given amount of glass has been removed to bring the fine ground spherical surface down to the desired radius of curvature. Accordingly, a block of lenses is given a combined rough and fine grind with but a single feeding operation of a grinding wheel and with but a single chucking operation of the block of lenses on a single machine. This method, therefore, cuts the time originally required to rough and fine grind a block of lens blanks approximately in half, reduces the amount of handling of the block of lenses to half, and also cuts the machine requirements.
  • Fig. 2 I have shown a new grinding wheel just contacting the original or unground surface to be generated down to a given fine ground spherical surface of lesser radius.
  • the curved surfaces 20 and 2I of both the abrasive rings I8 and I9 respectively is shown to have the same radius of curvature and both engaging the surface to be generated.
  • the ring I8 of coarse abrasive will do the major part of the grinding, since the outside edge of the ring I8 engages the work with firmer pressure and the fine abrasive ring I9 wears away faster than the coarse abrasive ring I8.
  • the reference numeral I generally indicates a new surface to be generated; the numeral 2 indicates the surface after being substantially completely rough ground, and 3 indicates the surface as substantially brought to test.
  • and the manner in which they successively contact the work as the wheel is fed inwardly, is obviously exaggerated to clearly point out the principles of operation of the present invention.
  • of the abrasive rings I8 or I9 having decidedly different radii of curvature which join in a ridge, as shown in Fig. 5, these two surfaces will, in fact, blend together so that their difference in curvature is difficult to detect by feel, or with the naked eye.
  • a grinding wheel is indicated in Fig. 6 where l8 indicates the ring of bonded coarse abrasive, and I9 indicates the ring of bonded fine abrasive. This relationship of rings I8 and I9 provides a combined rough and fine grind wheel which has a much longer life than one in which the rings of the two abrasives are of equal width.
  • This method of grinding is applicable to the generation of spherical concave surfaces, as well as spherical convex surfaces.
  • the blanks I0 would be fixedly located in sea-ts II in the spherical concave periphery of a blocking tool I 2'.
  • This block is then rotated by means of a spindle I5 about an axis which passes through point I4 which is the center of curvature of the finished surface desired on the lens blanks.
  • a grinding wheel I6 which is adapted to be rotated about its spindle axis by any suitable means, not shown, is disposed with its axis inclined to the axis of rotation of the block I2 and passing through the center of curvature I4.
  • Fixed to the end of the wheel IS in side-by-side relation are a ring I8" of bonded coarse abrasive and a ring I9 of bonded fine abrasive.
  • the ring of coarse abrasive being outside of the ring of fine abrasive.
  • " of rings I8" and I9 are convex instead of concave, as in the case for generating convex spherical surfaces.
  • the wheel I6 may be fed toward the work along its axis by any suitable means and the change in radius of curvature of the work from the beginning of rough grinding to the finish of fine grinding is sufficient to cause the ring I 8" to begin to grind along its outside edge and to finish grinding along the inside edge of ring I9", as outlined above.
  • the radius of curvature of the work will increase, rather than decrease, as the grinding proceeds, and the surfaces 20 and 2
  • the wheel-feeding means as comprising a cylinder C in which an enlarged end E on the tool spindle I'I acts as a piston. Air introduced into cylinder 0 through port P from air line A will normally force the wheel I6 against the block of work.
  • FIG. 8 and 9 One form ofapparatus fordoing is shown in Figs. 8 and 9 wherein a grinding wheel 4'0 having a ring 4 lof bonded fine abrasive is mounted in telescoping relation with a grinding wheel 42 having a ring 43 of bonded coarse abrasive.
  • a spindle 44 on the-wheel 40 has a sliding fit with a sleeve 45 on wheel 42; said sleeve,,in turn, having a sliding and rotating fit with a cylinder 46.
  • Spindle 44 is connected to sleeve 45. by keys and keyways 41 and 48, respectively, so. as to be rotated with sleeve 45 when it isdriven by :a belt 49 engaging pulley 50 fixed to thesleeve.
  • the top of, cylinder 46. is covered by a cap 52 including a portion 53 telescoping with the upper end of sleeve 45.
  • Sleeve 45 has a reduced diameter 54 roviding a circular chamber 55 between the cylinder wall and thesleeveand which is connected to the interior of the sleeve at a point above the end of the spindle 44' by a plurality of radial ports 55.
  • Thiscircular chamber 5515 connected with an inlet port 57 in the cylinder wall and to which air, under pressure, may be fed from supply line 58o-r from which air may .beexhausted under the control of rotary valve 60.
  • the block of-lenses is properly located with its axis of rotation inclined .to the rotational axis of wheels 40 and 42, as ab-ovedescribed, and when the valve 60 is rota-ted to the position shown in Fig. 8, air under pressure entering chamber 55 acts .on the top of spindle 44 to. force it downwardly toward the work along the axis. of rotation of the wheels. Because compression spring is fairly heavy, sleeve 45 will beforced downwardly with spindle 44 and wheel 4.2, and its ring 43 will be forced againstthe work.
  • the rough and fine grinding wheels are brought into successive operation with a block. of lenses by feeding the two wheels along their common axis relative to the work, and both the, rough and fine grind operations are performed on one machine with a single feeding operation of the wheels, andwith but a single chucking operation of the work, whereas in the first embodiment the successive operation of the rough and fine grind rings depends upon the change in radius of the work.
  • the successive operation of the rough and fine grind rings is under mechanical control so that the'desired successive action of the two different grades of abrasive rings can be obtained regardless of the change in curvature which the work is susceptible of during the complete generating operation.
  • An abrading tool for generating a spherical surface on a piece of work comprising a pair of telescopically arranged sleeves adapted to be rotated simultaneously about their common axis, a ring of bonded coarse abrasive fixed to the end of the outer sleeve, a ring of bonded fine abrasive fixed to the end of the inner sleeve, the exposed face of each of said rings being arcuate and having substantially the same center of curvature, and means for telescoping one sleeve relative to the other to extend and retract the face of one of said ring-s axially relative to the face of the other.
  • An abrad-ing apparatus for rough and fine grinding a spherical surface on a piece of work with one feeding stroke of a single tool and comprising in combination arota-table work spindle, means for blocking said work on said spindle in such a way that the center of curvature of the surface to be'generated will be on the axis of said spindle, a rotatable cup-shaped grinding wheel.
  • the rim of said grinding wheel comprising a ring of bonded coarse abrasive and a ring of bonded fine abrasive connected in concentric relationship with the ring of bonded fine abrasive lying within the other ring the exposed ends of said abrasive rings constituting the work-engaging faces and being arcuate about centers lying on the axis of said wheel, and means for feeding said grinding wheel into engagement with said piece of work along the axis of said wheel until the desired fine ground surface is, obtained on thepiece of work.
  • An abrading tool for generating a spherical surface on a pieceof work comprising a cupshaped wheel adapted to be fed axially toward the surface to be abraded; a ring of bonded coarse abrasive fixed to the endof the rim of said wheel, and a ring of bonded fine abrasive fixed to the end-of the rim of saidwheel within, and in adjacent concentric relation to said ring of bonded coarse abrasive, the exposed ends of said abrasive rings constituting the work-engaging faces and being arcuate about centers lying on the axis of said wheel, said inner ring having a diameter sufficiently large that its periphery will fully embrace the spherical surface to be ground when said wheel is moved into engagement with said surface alone, the wheel axis when said axis is inclined to the axis of rotation of the work and passes through the center of curvature of said spherical surface.
  • An abrading tool for generating a spherical surface on a blank of work initially having a generally spherical surface of radius of curvature different than the radius of curvature of the surface to be generated on the work, and comprising a cup-shaped wheel, a ring of bonded coarse abrasive fixed directly to the end of the rim of said wheel, and a ring of bonded fine abrasive fixed directly to the end of the rim of said wheel within, and in adjacent concentric relation to, said ring of coarse abrasive, the exposed ends of said rings constituting the work engaging surfaces and being arcuate and substantially contiguous and defining a sphere having a radius of curvature substantially equal to that of the blank of work prior to grinding.
  • An abrading tool in which the exposed arcuate end of the outer ring has a radius of curvature substantially equal to the radiusof curvature of the blank of Work prior to grinding and the arcuate end of the inner ring has a radius of curvature substantially equal to the radius of curvature of the surface to be finally generated on the blank of work.
  • An abrading apparatus characterized by the fact that the work-engaging faces of said rings of abrasive are'arcuately shaped to a different degree so that during the initial part of the grinding operation the ring of coarse abrasive engages the work and when the radius of curvature of the work approaches the desired radius, the ring of fine abrasive automatically takes over the grinding operation from the ring of coarse abrasive and continues to grind until the desired surface is generated on the work.
  • An abrading apparatus for rough and fine grinding a spherical convex surface of given radius of curvature on a piece of work initially having a spherical convex surface of larger radius of curvature than finally desired and comprising in combination a rotatable work spindle, means for blocking said work on said spindle in such a way that the center of curvature of the surface to be generated will be on the axis of said spindle, a rotatable cup-shaped grinding wheel disposed with its axis of rotation inclined to the axis of said work spindle and intersecting the center of curvature of the surface to be generated, the rim of said grinding wheel having fixed thereto a ring of bonded coarse abrasive and a ring of bonded fine abrasive, the ring of fine abrasive being disposed concentrically within, and in abutting relation with, said ring of coarse abrasive, the exposed ends of said rings having spherically concave
  • An abrading apparatus for rough and fine grinding a spherical surface on a piece of work and comprising in combination a rotatable work spindle, means for blocking said work on said spindle so that the center of curvature of the surface to be generated will coincide with the axis of said spindle, a rotatable tubular grinding tool disposed with its axis of rotation inclined to the axis of said work spindle and intersecting the center of curvature of the surface to be generated, a ring of bonded coarse abrasive fixed to the end of said tool and having an arcuate abrading face forming a part of a sphere substantially complementary in shape to the spherical surface on the work when blocked, a second rotatable grinding tool telescopically disposed within said first tool, a ring of bonded fine abrasive fixed to the end of said second tool and having an arcuate abrading face forming a part of a sphere substantially complementary in shape to the spher

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US88624A 1949-04-20 1949-04-20 Apparatus for rough and fine grinding of spherical surfaces Expired - Lifetime US2600815A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US88624A US2600815A (en) 1949-04-20 1949-04-20 Apparatus for rough and fine grinding of spherical surfaces
FR1041560D FR1041560A (fr) 1949-04-20 1950-04-20 Procédé et appareil pour le travail de surfaces sphériques
GB9739/50A GB671766A (en) 1949-04-20 1950-04-20 An improved method of, and apparatus for grinding spherical surfaces

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US88624A US2600815A (en) 1949-04-20 1949-04-20 Apparatus for rough and fine grinding of spherical surfaces

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649667A (en) * 1952-08-25 1953-08-25 American Optical Corp Abrading device
US2880555A (en) * 1955-05-31 1959-04-07 Revere Camera Co Lens grinding apparatus
US2982057A (en) * 1957-08-26 1961-05-02 Micromatic Hone Corp Spherical grinding machine and method
US2984054A (en) * 1958-05-21 1961-05-16 Dewrance & Co Lapping machines
US3004372A (en) * 1956-02-15 1961-10-17 Bozena Marie Phillips Apparatus for producing ophthalmic lenses
US3016662A (en) * 1958-09-11 1962-01-16 Micromatic Hone Corp Ball honing tool
US3079739A (en) * 1959-02-18 1963-03-05 Rank Precision Ind Ltd Method and apparatus for positioning a workpiece for polishing
US3456391A (en) * 1965-03-20 1969-07-22 Attilio Venesia Self-centering grinding system particularly suitable for the finishing and repair of large crankshafts
US3816997A (en) * 1972-03-20 1974-06-18 Itek Corp Apparatus for simultaneously performing rough and fine grinding operations
US3866358A (en) * 1973-08-02 1975-02-18 Itek Corp Method and apparatus for generating toroidal surfaces
US3882646A (en) * 1974-03-06 1975-05-13 Gleason Works Grinding wheel assembly having multiple grinding surfaces for selective engagement with a workpiece
US3885925A (en) * 1972-10-23 1975-05-27 Alexander Tatar Method for the sharpening of four faces drills and sharpening machine for carrying out this method
US3961448A (en) * 1973-09-28 1976-06-08 Akahane S Whole spherical surface polishing device
FR2573685A1 (fr) * 1984-11-28 1986-05-30 Flachglas Ag Perceuse, en particulier machine a percer le verre
US5092083A (en) * 1991-01-16 1992-03-03 Inland Diamond Products Company Fly cutter generator wheel with novel diamond grit configuration to eliminate lens fracture and back cutting
US5168661A (en) * 1990-05-30 1992-12-08 The Gleason Works Method of grinding the surfaces of cutting blades and grinding wheel therefor
US5217335A (en) * 1990-04-24 1993-06-08 National Optronics, Inc. Plastic lens generator and method
US5241794A (en) * 1990-05-30 1993-09-07 The Gleason Works Grinding wheel for cutting blades
US20040065117A1 (en) * 2002-07-25 2004-04-08 Carl Zeiss Smt Ag Method and device for producing optical elements with at least one curved surface
US20070049175A1 (en) * 2005-08-29 2007-03-01 Edge Technologies, Inc. Diamond tool blade with circular cutting edge
EP1203626B1 (fr) 2000-02-16 2007-04-11 Seiko Epson Corporation Procede de fabrication de verres de lunettes, et outil de polissage
US7303461B1 (en) * 2006-12-05 2007-12-04 Pratt & Whitney Canada Corp. Method of machining airfoils by disc tools
WO2011141500A1 (fr) * 2010-05-14 2011-11-17 Saint-Gobain Diamantwerkzeuge Gmbh & Co. Kg Meule
US20160368112A1 (en) * 2015-06-17 2016-12-22 Ntn-Snr Roulements Method for Grinding a Surface of a Rolling Element for a Roller Bearing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353303A (en) * 1964-11-13 1967-11-21 Ait Ind Inc Art of edging
CN110524414A (zh) * 2019-09-17 2019-12-03 青岛高测科技股份有限公司 一种用于晶硅粗磨精磨一体机的磨削主轴及其使用方法
CN111975596A (zh) * 2020-08-23 2020-11-24 吉林大学 一种适用于水下环境的仿形研磨装置

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DE199312C (fr) *
US1327440A (en) * 1918-02-09 1920-01-06 Carborundum Co Apparatus for smoothing and polishing stone
US1401832A (en) * 1915-11-01 1921-12-27 Taylor William Method of grinding glass
US1828663A (en) * 1928-05-15 1931-10-20 Jopp August Machine for grinding simultaneously two opposed surfaces of articles of prismatic orother shape, especially nuts
US2286361A (en) * 1939-03-27 1942-06-16 American Optical Corp Abrading machine
US2309016A (en) * 1942-02-09 1943-01-19 Norton Co Composite grinding wheel
US2451295A (en) * 1944-11-08 1948-10-12 Super Cut Abrasive wheel
US2510113A (en) * 1945-03-17 1950-06-06 Arthur J Holman Machine for grinding lenses

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE199312C (fr) *
US1401832A (en) * 1915-11-01 1921-12-27 Taylor William Method of grinding glass
US1327440A (en) * 1918-02-09 1920-01-06 Carborundum Co Apparatus for smoothing and polishing stone
US1828663A (en) * 1928-05-15 1931-10-20 Jopp August Machine for grinding simultaneously two opposed surfaces of articles of prismatic orother shape, especially nuts
US2286361A (en) * 1939-03-27 1942-06-16 American Optical Corp Abrading machine
US2309016A (en) * 1942-02-09 1943-01-19 Norton Co Composite grinding wheel
US2451295A (en) * 1944-11-08 1948-10-12 Super Cut Abrasive wheel
US2510113A (en) * 1945-03-17 1950-06-06 Arthur J Holman Machine for grinding lenses

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649667A (en) * 1952-08-25 1953-08-25 American Optical Corp Abrading device
US2880555A (en) * 1955-05-31 1959-04-07 Revere Camera Co Lens grinding apparatus
US3004372A (en) * 1956-02-15 1961-10-17 Bozena Marie Phillips Apparatus for producing ophthalmic lenses
US2982057A (en) * 1957-08-26 1961-05-02 Micromatic Hone Corp Spherical grinding machine and method
US2984054A (en) * 1958-05-21 1961-05-16 Dewrance & Co Lapping machines
US3016662A (en) * 1958-09-11 1962-01-16 Micromatic Hone Corp Ball honing tool
US3079739A (en) * 1959-02-18 1963-03-05 Rank Precision Ind Ltd Method and apparatus for positioning a workpiece for polishing
US3456391A (en) * 1965-03-20 1969-07-22 Attilio Venesia Self-centering grinding system particularly suitable for the finishing and repair of large crankshafts
US3816997A (en) * 1972-03-20 1974-06-18 Itek Corp Apparatus for simultaneously performing rough and fine grinding operations
US3885925A (en) * 1972-10-23 1975-05-27 Alexander Tatar Method for the sharpening of four faces drills and sharpening machine for carrying out this method
US3866358A (en) * 1973-08-02 1975-02-18 Itek Corp Method and apparatus for generating toroidal surfaces
US3961448A (en) * 1973-09-28 1976-06-08 Akahane S Whole spherical surface polishing device
US3882646A (en) * 1974-03-06 1975-05-13 Gleason Works Grinding wheel assembly having multiple grinding surfaces for selective engagement with a workpiece
FR2573685A1 (fr) * 1984-11-28 1986-05-30 Flachglas Ag Perceuse, en particulier machine a percer le verre
US5217335A (en) * 1990-04-24 1993-06-08 National Optronics, Inc. Plastic lens generator and method
US5241794A (en) * 1990-05-30 1993-09-07 The Gleason Works Grinding wheel for cutting blades
US5168661A (en) * 1990-05-30 1992-12-08 The Gleason Works Method of grinding the surfaces of cutting blades and grinding wheel therefor
US5092083A (en) * 1991-01-16 1992-03-03 Inland Diamond Products Company Fly cutter generator wheel with novel diamond grit configuration to eliminate lens fracture and back cutting
EP1203626B1 (fr) 2000-02-16 2007-04-11 Seiko Epson Corporation Procede de fabrication de verres de lunettes, et outil de polissage
US20040065117A1 (en) * 2002-07-25 2004-04-08 Carl Zeiss Smt Ag Method and device for producing optical elements with at least one curved surface
US20070049175A1 (en) * 2005-08-29 2007-03-01 Edge Technologies, Inc. Diamond tool blade with circular cutting edge
US20080026678A1 (en) * 2005-08-29 2008-01-31 Kim George A Diamond tool blade with circular cutting edge
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Also Published As

Publication number Publication date
FR1041560A (fr) 1953-10-26
GB671766A (en) 1952-05-07

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