IE840686L - Cutting of spherical faceted gems - Google Patents

Cutting of spherical faceted gems

Info

Publication number
IE840686L
IE840686L IE840686A IE68684A IE840686L IE 840686 L IE840686 L IE 840686L IE 840686 A IE840686 A IE 840686A IE 68684 A IE68684 A IE 68684A IE 840686 L IE840686 L IE 840686L
Authority
IE
Ireland
Prior art keywords
gem
faceter
abrasive surface
spherical
cutting
Prior art date
Application number
IE840686A
Other versions
IE55064B1 (en
Original Assignee
Colliva Giovanni
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Colliva Giovanni filed Critical Colliva Giovanni
Publication of IE840686L publication Critical patent/IE840686L/en
Publication of IE55064B1 publication Critical patent/IE55064B1/en

Links

Classifications

    • 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
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/16—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of diamonds; of jewels or the like; Diamond grinders' dops; Dop holders or tongs
    • B24B9/168—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of diamonds; of jewels or the like; Diamond grinders' dops; Dop holders or tongs grinding peripheral, e.g. conical or cylindrical, surfaces

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Adornments (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

Apparatus for gem lapidation comprises a curved abrasive surface (S2) and a faceter (A-C). The abrasive surface (S2) is rotatable relatively to the faceter. The faceter is mounted at two points (A, B) on another spherical surface (S1) such that in use when a gem is held by a gem- carrying terminal (C) of the faceter against the abrasive surface (S2) subsequent movement of the faceter relatively to the abrasive surface causes the gem to move along a path having substantially the same radius of curvature as the abrasive surface whereby a constant angle is maintained between the gem carrying terminal and the normal at the point of contact of the gem with the abrasive surface (52). Gemstones having at least some spherical facets (convex or concave) may be so made. <IMAGE> [GB2144622A]
IE686/84A 1983-08-03 1984-03-20 Gemstones and apparatus for their lapidation IE55064B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT22408/83A IT1168707B (en) 1983-08-03 1983-08-03 EQUIPMENT FOR CUTTING GEMS WITH SPHERICAL FACETS AND GEMS SO OBTAINED

Publications (2)

Publication Number Publication Date
IE840686L true IE840686L (en) 1985-02-03
IE55064B1 IE55064B1 (en) 1990-05-09

Family

ID=11195907

Family Applications (1)

Application Number Title Priority Date Filing Date
IE686/84A IE55064B1 (en) 1983-08-03 1984-03-20 Gemstones and apparatus for their lapidation

Country Status (4)

Country Link
GB (1) GB2144622B (en)
IE (1) IE55064B1 (en)
IN (1) IN160559B (en)
IT (1) IT1168707B (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB581619A (en) * 1943-09-21 1946-10-18 Linde Air Prod Co Improvements in synthetic gem bodies and their manufacture
GB697804A (en) * 1949-12-21 1953-09-30 Union Carbide & Carbon Corp Improvements in and relating to the manufacture of synthetic corundum containing titanium
FR1564878A (en) * 1968-03-13 1969-04-25
IL39936A (en) * 1971-07-30 1975-04-25 De Beers Ind Diamond A diamond particle particularly for use in heat sinks
BE793007A (en) * 1971-12-20 1973-06-19 Union Carbide Corp PROCESS FOR MODIFYING THE APPEARANCE OF CORUNDUM CRYSTALS AND CRYSTALS THUS OBTAINED
US3742731A (en) * 1972-06-08 1973-07-03 Queensbury Opal Co Ltd Gem having light piping fibres with cores of high refractve index and clad layers of lower refractive index
IL58834A (en) * 1978-12-06 1982-12-31 Clarke Roger Maxwell Gemstone and method and device for cutting it

Also Published As

Publication number Publication date
IN160559B (en) 1987-07-18
IT8322408A0 (en) 1983-08-03
IT8322408A1 (en) 1985-02-03
IT1168707B (en) 1987-05-20
GB2144622A (en) 1985-03-13
GB2144622B (en) 1987-01-14
GB8407316D0 (en) 1984-04-26
IE55064B1 (en) 1990-05-09

Similar Documents

Publication Publication Date Title
US4738240A (en) Process for cutting a diamond to provide an invisible mounting
JPS6464915A (en) Belt cleaner
EP0180310A3 (en) Clamping means for a strap
CA2130136A1 (en) Abrasive article and method of making same
EP0743761A3 (en) Holder for a paging receiver
SE9301790D0 (en) RUNDSKAER
CA2153380A1 (en) Antenna Positioning Apparatus
PL315026A1 (en) Edge grinding machine for rounding sharp edges of workpieces
JPS6416358A (en) Method and device for forming faucet onto surface on reverse side terminated at end section of cutting instrument
CA2023121A1 (en) Apparatus for sharpening the blade of a skate
IE883230L (en) Laser profiling of lenses
IE840686L (en) Cutting of spherical faceted gems
DE69011306D1 (en) Watch case with a rotating bezel.
ATE85203T1 (en) DEVICE FOR EXAMINING CONTACT LENSES.
DK584189A (en) TERMINALS CUTTER
ES276594U (en) Sliding hook device for clasping pearl or glass bead necklaces that have a free hanging end
AU568048B2 (en) Grinding a transverse element for a driving belt
EP0345631A3 (en) Blocking shim and method for prescription-laboratory processing of aspheric progressive-addition lenses
JPS6464702A (en) Monocrystal cutting tool
GB1480431A (en) Method of polishing diamonds
CH648450GA3 (en)
EP0213686A3 (en) Lens and pattern holder
GB2067386A (en) Mirror on watchband
IT1253660B (en) Blade for cutting blocks of hard stone material, such as granite or the like
USD287517S (en) Boomerang