because of the stresses upon the impactor assembly as shown in fig1 pan 12 rests not only on wheels 30 32 and 34 but also on wheels 51 of impactor assembly 53 impactor assembly 53 is vibrated by vibration motor 55 which is attached to impactor base plate 57 and as impactor assembly 53 vibrates wheels 51 continually strike the underside of pan 12 it is the repeated impact of wheels 51 which induce vibrations in pan 12 and the material within pan 12 it is quite apparent that in order for impactor assembly 53 to vibrate and strike pan 12 impactor assembly 53 must be attached to support frame 14 with a resilient system and typically simple rubber pads have been used however the present invention makes use of this resilient support system to provide a new control for the intensity of the impacts to which pan 12 is subjected to accomplish this base plate 57 is attached to support frame 14 with inflatable air shock mounts 54 therefore as the inflation pressure of shock mounts 54 is varied the amplitude of the vibration of impactor assembly 53 varies and the impact against pan 12 also varies by this means a dimension of control of the disc dryer is attained which has never.