Pivoting jar mill with rotating discharge grate

A rotary milling system for using grinding media to create a milled product, the system comprising:

• a motor that drives a shaft having a longitudinal axis, with the shaft being connected to a rotatable body having a sidewall extending between first and second ends thereof, a first end wall at the first end, and an opening at the second end, the body defining a cavity and a central longitudinal axis that is coextensive with the longitudinal axis of the shaft, the rotatable body configured to retain grinding media therein;
• a discharge grate detachably mounted to the second end of the body, the discharge grate covering the opening when mounted to the second end and rotationally fixed to the body and including a shaft extending longitudinally away from the discharge grate;
• a plurality of holes passing through the discharge grate and configured to retain grinding media within the cavity of the body while allowing milled product to pass through the holes during rotation of the body about the central longitudinal axis;
• a discharge housing attached to and biased against the discharge grate, the discharge housing configured to receive the milled product and including a bushing through which the shaft extends;
• and
• a spring extending between the shaft and the bushing to bias the bushing toward the discharge grate,
• wherein the discharge grate is rotatable relative to the discharge housing when the body is rotated about the longitudinal axis;
• wherein the rotatable body is selectively rotatable about the longitudinal axis of the shaft and the rotatable body and selectively pivotable about a pivot axis that extends transverse to the longitudinal axis of the shaft and rotatable body such that in one position the central longitudinal axis is orthogonal to the longitudinal axis of the shaft;
• wherein the rotatable body has a first orientation and a second orientation, the second orientation being pivoted about the pivot axis relative to the first orientation such that the opening is disposed upward relative to the first orientation.