The machine comprises of a hollow cylinder, which is horizontally mounted on a strong frame on ball bearings. The cylinder has an opening, which can be closed with a dust tight cover to promote charging and discharging the cylinder with the material under test. It consists of a detachable extension that extends throughout the interior of the cylinder and prevents it from falling on the cover. The cylinder is rotated by an electric motor through a heavy reduction gear. A revolution counter is attached to the frame and provided with tray for collection of materials at the end of the test. The machine is supplied with abrasive charges consisting of a set of 12 hardened steel balls having approximately 48 mm diameter.

The machine comprises of a hollow cylinder, which is horizontally mounted on a strong frame on ball bearings. The cylinder has an opening, which can be closed with a dust tight cover to promote charging and discharging the cylinder with the material under test. It consists of a detachable extension that extends throughout the interior of the cylinder and prevents it from falling on the cover. The cylinder is rotated by an electric motor through a heavy reduction gear. A revolution counter is attached to the frame and provided with tray for collection of materials at the end of the test. The machine is supplied with abrasive charges consisting of a set of 12 hardened steel balls having approximately 48 mm diameter.