For high-speed uniform grinding to analytical fineness of wet and dry samples, from rocks and minerals to ceramics and cement.

Precision sample preparation for XRF and AA analysis as well as for geological/mineral assay work.
Batch grinding from 1cc to 200cc samples

Three vibration amplitude settings

Most samples ground to analytical fineness in 1 to 3 minutes

Suitable for a wide range of grinding dishes, from the most fragile to the
hardest and heaviest

Negligible contamination The British-made GYRO MILL is the perfect choice for rapid, homogeneous and reproducible grinding of samples, both wet and dry. It is widely used in geological/mineral assay work for sample preparation as well as for wet chemistry and instrumental analysis, such as XRF spectroscopy.

Materials routinely ground by this method include brick, castings, cement, ceramics, chemicals, clinker, coal, coke, concrete, ferro-alloys, fertilisers, fluxes, glass, iron, limestone, minerals, paint, pesticides, pharmaceuticals, dried plant material, ore, precious stones, rocks, metals, sand, slags, silicates, soil, steel, wood...

The GYRO MILL is particularly recommended for grinding smaller samples from 1cc to 250cc. Typically, the maximum initial particle size is approximately 12mm, depending on hardness of the material.

GRINDING INTENSITY CONTROL

The GYRO MILL has a positive advantage over many other dish and puck mills
in that the grinding intensity can be adjusted to one of three settings.

Amplitude adjustment ensures the best possible results, since it can be set to complement the special characteristics of the feed material, the fineness required, the wear rate of the dishes and the degree of contamination from the grinding dishes which can be tolerated. By selecting the optimum combination of amplitude and timer settings, precision particle size distributions can be achieved and reproduced.

HORIZONTAL GRINDING ACTION

A further advantage is that it is designed to ensure a smooth, horizontal grinding action with minimal vertical vibration. The puck and rings are larger and have greater height than those in conventional dish and puck mills. Consequently, they avoid ‘bouncing’ off the lid and base of the dish in a vertical direction, minimising excessive wear in these areas together with unnecessary sample contamination.

WORKING PRINCIPLE

The GYRO MILL uses a fixed-speed, standard motor coupled to a flexible drive shaft. Two eccentric weights mounted on the drive shaft transmit a horizontal gyratory vibration to the sealed grinding dish clamped into position on the mill. The vibration causes the puck and one or two rings in the dish to rotate freely, crushing the sample.

Grinding performance is easily controlled by a patented mechanism which adjusts the position of the eccentric weight in relation to each other, allowing three possible grinding intensity amplitudes. With maximum overlap of the weights (‘high setting’), the largest amplitude is achieved; with minimum overlap (‘low setting’), the amplitude is at its smallest


ADVANTAGES