The PRECISION's, TI 05T Tumbler Tester for iron oxide lump cores, sinters, and pellets consists of a cylindrical drum constructed of mild steel plate. The two circular sides of the drum have two stub axles attached through two circular flanges. The axles are held in two double-row self-aligning ball bearings with the common axis of the axles located in a horizontal plane. The drum is rotated about its axis at the specified speed with the help of an electric motor, worm reduction gearbox, and Vbelt / pulley arrangement. A pre-set type digital counter is provided to record the number of rotations of the drum and toautomatically stop the motor after a set number of rotations. The bearings on which the drum is pivoted are supported on a heavy-duty fabricated metal frame made from mild steel sections. The motor and worm reduction gearbox are also mounted on the same frame to give a single composite unit. A sheet metal hop- per is provided below the drum to collect the material coming out when the drum is rotated with the door removed. The hopper has a square opening to enable the collected material to be removed. A removable stainless steel tray is provided to collect the material from the drum.
The Tumbler Index is a relative measure of the resistance of the material to breakage or degradation by impact. (ii) Abrasion Index: It is a relative measure the degradation of iron ore by abrasion. The Tumbler Index and Aibrasion Index are determined in a tumbler test apparatus as per the Bureau of Indian Standard No. IS:6495 .