GEMMASTA GMP8 No.4 Grinder 6 Inch

6 Inch x 4 Wheel Grinder

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GEMMASTA GMP8 No.4 Grinder

Includes Stainless Steel Tray, Baseboard, Motor and Wheels

A must for the professionally minded cutter, offering all the benefits of processing with diamond on one comprehensive, robust machine. It includes 2 diamond grinding wheels with 2 diamond sanding wheels and 2 flattening discs.

We recommend that polishing be done separately (see GEMMASTA GSP8 Polishing unit )

The body of the machine is a heavy walled, durable aluminium casting. It has wide cast aluminium guards eliminating rust and sheet metal vibrations.

Water fittings are supplied, with independant tap control to each diamond wheel, where the water is spread across the face of the wheels and then minimized by means of a rubber flap. The machine is mounted in a heavy duty, large capacity, stainless steel tray.

A 1/3hp motor is supplied and combined with the three step machine pulley provide a variety of speeds to suit a range of uses.


2 - 6"x 1.5" nickel bonded diamond wheels of 180# and 360#

2 - 6"x 1.5" resin bonded diamond wheels of 600# and 1200#

2 - 6" machined aluminium discs  1" bore UNF thread


Originally designed and built by Roy Gaerth in Adelaide in 1972, these heavy duty lapidary grinders have long been the machine of choice for many people in the Australian Opal Industry, and in Gem and Lapidary Clubs right around Australia. Roy eventually sold the manufacturing rights to Gemmasta Lapidary Equipment in Flinders Park, South Australia and it was later aquired by Shell-Lap in Adelaide. In 2018 Shell-Lap closed when the owner retired and the manufacturing moved to Ballina in NSW.

Since then the machine has undergone several design improvements to make it even better than the original.

The Gemmasta GMP8-4 now comes with a full stainless steel tray that replaces the plastic moulded tray that was previously supplied with this model. The bearings have been replaced with fully sealed units.

The 3/4 Inch shaft has been updated to a full 1 inch stainess steel shaft. This provides additional rigidity and greater support, particularly those users that want to run heavy sintered grinding wheels.

The 1 inch shaft also means that lapidary wheels used on this machine do not reqire bushing and are less prone to vibration.

This is a machine that is built to last, made of solid cast aluminium components with a lifetime warranty against manufacturing faults.



SKU GMP8-4-6
Brand Gemmasta
Shipping Weight 45.0000kg
Shipping Width 0.740m
Shipping Height 0.380m
Shipping Length 0.450m
Shipping Cubic 0.126540000m3
Unit Of Measure ea

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