Dorry Ab Testing Machine

 For testing the aggtregates for resistance to abrasion in accordance with the standard procedure laid doen in BS : 812. The apparatus consists of a metal disc which revolves in a horizontal plane on a vertical shaft. A suitable attachment for holding the specimen with is axis vertical and its lower end pressed with a prescribed pressure against the surface of the disc (the distance from the centre of specimen to the centre of shaft being 25 cm) is provided. A convenient funnel for feeding sand continuosly upon the rotating disc is also provided. The machine is fitted with a ¼ h.p. electric motor, driven through a reduction gear to give 28-30 revolution of the disc per minute. Suitable for operation from 220/230 volts single phase, A.C. supply.