(ii) Frames: The rollers are supported at their journals on two set of frames at two ends. The frames heavy tie rods to make a composite frame structure suitable for are connected by grouting the conveyor frame on its foundation. For a heavy duty conveyor, the framework is usually from cast steel, and for a lighter duty conveyor, the frames may be fabri made cated from rolled steel plates and sections. Design of the frames largely depend on the drive system employed (iii) Drive arrangement: Major classification of powered roller conveyor is based on the type of drive arrangement employed When one motor drives more than one or all the driven rollers, it is called Group or Multiple drive. In drive, generally only one motor with suitable transmission arrangement is group used to drive all the driven rollers. For a long conveyor, or from other considerations, more than one motor may be used, each driving a group of rollers in different sections of the conveyor. The transmission of power from the motor to the rollers vary widely depending on use. In a heavy duty non-reversing conveyor, bevel gear transmission arrangement may be used. The motor, through a gear box drives a shaft placed along the length of the drive side of the conveyor. Power to all the rollers are through set of two bevel gears as shown in Fig. 6.6.5. The drive shaft with supporting bearings and the bevel gears are housed in the box frame, and partially immersed in oil for lubrication. In an alternative design the