About the Machine

The machine base is a sturdy Cast Iron base, which forms the machine table and is suitably supported by a sturdy steel angle frame. Ā¼ h.p. 1440 rpm single-phase 220 Volts AC-50 cycle motor to drive the grinding lap. One stepper motor to drive the work piece is included with the machine.speed of work is changed by three step pullies.

A central housing that contains the main shaft driven by the main motor, the r.p.m. of which can be adjusted with the help of step pulleys provided. The main facetor of the machine is mounted on a bearing pedestal on top of two cross slides made of sturdy cast iron. All this is mounted on a bearing housing for a separate angular movement. The master template is fixed to the back of the collet and is supported by a revolving base. Separate templates are supplied for different shapes.

The machine is fixed with the light attachment and a control panel, which contains the various electrical switches and a pilot lamp. The machine is fixed with coolant splashguards and coolant re-circulation system.


The Gemstone is fixed on to a metal (brass/iron) dopstick with the help of a two compound epoxy glue. The dopstick is heated for the glue to settle. The dop stick with the stone is then inserted into the collet in the facetor and locked. The electrical connections are so designed that as soon as the facetor is brought nearer the grinding lap, the facetor motor starts operating. The stone is then ground on the grinding lap in accordance with the shape of the template used.
The motors help in rotating the grinding laps, the work piece, the master template for the shape etc. The loading and un-loading of the stone and the angular movement are to be done manually. The cross slides – like that of a lathe machine – are used for:1. Setting the correct desired size of the stone – calibration. All stones operated on this setting will produce same size stones.2. Setting the height of the dome of the cabochon. This means that one can make cabochons of different dome heights with the same master template.3. For utilizing the grinding lap to the maximum possible.


  • This machine makes cabochons on a standard 8″ dia-grinding lap as against the expensive variations used in many other machines.
  • This machine uses a two dimensional template as against expensive 3-dimensional templates used in other machines.
  • This machine uses only one template for many different heights of domes of cabochons. Other machines need different templates for different dome heights.
  • This machine doubles as a calibration and pre-shaping machine for cut stones also.We also make Semi automatic Pre-forming Machines and calibration machines for faster and uniform production in virtually all shapes and sizes.


The grinding lap


Dopstick stands

Heater and Glue

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