grate 20a is supported by the three idler shafts 21a 21b 21c clearly shown in the longitudinal and cross sectional view of the module in fig1 and 13 respectively each idler shaft being supported by two bearings 24 shown in fig1 and 17 enclosed in each of three idler shaft housings 10a 10b 10c and by the first drive shaft 22 also supported by the two bearings 24 enclosed in a drive shaft housing 11 basically same housing as each of the three idler shaft housings 10a 10b 10c the first drive shaft 22 in the drive shaft housing 11 is driven either by a lever type handle or by a drive motor 8 shown in fig1 4 7 and 8 mounted on a bracket welded to the outer shell of the mgr agitation fire grate module on the other hand the upper surface of the outermost ring of the first moving grate 20a is of a sinusoidal profile in circumferential direction thereof and the lower surface of the outermost ring of the first moving grate 20a is gear teethed on a sinusoidal profile so that when driven by the first drive shaft 22 with a drive gear 23 thereon then mgr motion is made about the axis of rotation of the first moving grate 20a preserved by the support of the three idler shafts 21a 21b 21c and the first drive shaft 22 additional feature of this embodiment of geared track machined on the lower surface of the outermost ring of the first moving grate 20a provides prevention of accumulation of waste materials in between the gear and the geared track of.