This invention relates generally to mullers of the horizontal turntable type, and more particularly to such a muller in which a muller wheel, together with its shaft and bearings, can be tilted out of operating position to permit removal of ground materials. Also, the axis of the muller wheel is obliquely disposed when the wheel is in operating position so that its bearings can be isolated from the muller pan and to one side of it.

In the manufacture of many explosives, it is necessary to reduce a granular material to some predetermined mesh fineness. Those familiar with the art of explosives manufacture know that the grinding of such materials is often accompanied by serious hazards of explosion. For example, certain explosive components can be ground safely as long as they are in pure form and are shielded from any sparks in the environment. The lightest trace of impurity, however, serves as a potential detonating agent which can be ignited fairly easily, and will serve as a primer for the entire batch contained within the muller. The total quantity of the impurity need not be large; on the contrary, it may be very minute indeed, since a batch which is almost entirely pure may be exploded by a relatively small, local primer explosion of the impure portion.