FG1A - Coborn Engineering

FG1A - Form Grinding Machine for Single Crystal Diamond

Designed to meet the needs of the toolmaker supplying the jewellery and horological industries.


Designed to meet the needs of the toolmaker supplying the jewellery and horological industries, the FG1A Form Grinder has a number of features which make it ideal for natural diamond form (Posalux) tooling.

· Individual front / side clearance setting
· Variable speed main spindle
· Programmable Traverse stroke
· Programmable Traverse Speed
· Programmable Traverse Jog function (ideal for lining type tools)
· Multi-position adjustable toolholder
· On-machine optics (microscope, projector or VS5-G vision system)
· Touch screen control
· DXF import (VS5-G vision system only)

The FG1A comes mounted on a Strong tubular steel frame, the control panel and touch screen can be mounted for either right or left handed control and operation. Embedded PC for quick easy programming, can be connected to the internet for remote diagnostics and programming help.


Form Grinding diamond tool production machine FG1A

Dimensions (w x d x h) – 530 x 680 x 864 mm, Total machine weight   – 150kg

Machine Control
Machine control via – Control box and touch screen, Lateral Control (Oscillation) – CNC, Infeed and Pivot, – Control box and touch screen, Storage – Embedded PC

Wheel Spindle
Spindle Power – 0.75kW, Spindle Speed range (via inverter drive) – 0-3000 rpm, Spindle design – 4 bearing high precision electrical spindle, Wheel Dimensions – 125mm Dia x 40mm bore

Load application – Via dead weight, Weights provided – 0.5kg – 3kg (0.5kg steps), In-feed table travel length – 25mm, In-feed travel resolution – 1 micron via micrometer head

Toolholder Fixture
Type – multi-adjustable tool fixture, Maximum Front Grinding Clearance – +/- 20o, Maximum Side Clearance – +/- 20o, Height adjustment – +/- 10mm

Pivot Details
Movement (‘C’ axis) – 60 degrees (+/- 30o), Pivot motion – Manual

Options available (not included) – Microscope, Projector or VS5-G Vision system, Projection light source (on/off) – Yes, Optics mount movement (X / Y) – 12 / 12mm, Magnification (microscope and projector) – x30 or x50, Magnification (VS5-G vision system) – Zoom x60 – x600

Electrical Requirements – single phase and earth, 220 volts supply

FG1a Handbook


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