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Article: Faceting machine

Faceting machine

Faceting Machines and Components

  • Ultra-Tec, Facetron, Graves, and Poly-Metric are common non-commercial faceting machine brands.
  • Prices for these machines range from $1,800 to over $5,500.
  • Additional equipment and supplies are needed.
  • Two major components: mast/head assembly and grinding wheel/lap.
  • Mast assembly is the heart of a faceting machine.
  • Other components include arbor, arbor nut, motor, drip tank, and controls.
  • Arbor holds the lap and runs perfectly flat.
  • Motor is velocity-variable and can be reversed.
  • Drip tank serves to control heat and capture grinding particles.
  • Mast is a vertical pole mounted into the machine's base.
  • It must be machined carefully for proper perpendicularity to the lap.
  • Dop is a rod used to attach rough gemstone to the assembly.
  • Quill holds the dop and is lowered to place a facet.
  • Index wheel allows rotation of the quill for accurate facet cutting.

Angle Adjustment and Goniometer

  • Faceting machines have mechanisms for setting facet angles.
  • The quill lowers to the desired angle and indicates arrival.
  • Height adjustment determines the depth of a facet.
  • First adjustment sets the rough just touching the lap.
  • Fine adjustments can be made for desired depth.

Faceting Process

  • Rough stone is glued to the dop and inserted into the quill.
  • Index is set to determine the number of facets.
  • The first angle is set, and the quill is lowered to check.
  • Height adjustment ensures the rough touches the lap.
  • The lap spins, water is added, and grinding begins.
  • The quill is lifted and the facet is inspected.
  • Adequate depth is determined by reaching the midline of the stone.
  • The index is turned to number 8.
  • A second facet is ground to 45 degrees.
  • Six more facets are placed, resulting in an eight-sided pyramidal shape.

Rectangular Stone Faceting

  • Two facets are ground at 0 and 32 on the index.
  • The head is raised or lowered for placing facets at different levels.
  • Two facets are placed at 16 and 48.
  • The basic shape of the pavilion is created.
  • More facets at different angles can be placed.

Diamond Faceting and Gemcutter Specialization

  • Diamond is the hardest known substance on earth.
  • Finding a material to cut diamonds presents a challenge.
  • Diamond hardness varies along different crystal axes.
  • The rough diamond needs to be extensively studied for optimal cutting.
  • Diamond cutting machines require durability and different features.
  • Diamond cutting is more involved and expensive than cutting other gemstones.
  • Diamond cutting hobbyists are rare compared to other gemstone cutters.
  • A gemcutter who can cut professional-quality diamonds is called a diamantaire.
  • Diamantaire is a specialized term for a skilled diamond cutter.
  • Diamond cutting machines have unique requirements.

Faceting machine Data Sources

Reference URL
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