Cutter housing with field-replaceable seats

A disc cutter and mounting assembly for a tunnel boring machine comprising:

• a disc cutter assembly comprising a shaft having first and second end portions, and a cutter wheel rotatably disposed on the shaft, wherein the first and second end portions each include a first seat surface, a second seat surface, and a third seat surface;
• and
• first and second housing mount assemblies, each of the first and second housing mount assemblies configured to engage an associated one of the first and second end portions of the shaft and comprising:
• a housing half comprising a body portion, a first edge portion extending away from the body portion, and a second edge portion extending away from the body portion, wherein the body portion, the first edge portion, and the second edge portion cooperatively define a mounting space between the first and second edge portions;
• a removable seat block disposed in the mounting space and removably attached to the housing half such that a first face of the removable seat block is pressed against the first edge portion of the housing half, a second face of the removable seat block is pressed against the body portion of the housing half, and a seating face of the removable seat block is configured to engage the second seat surface of the associated end portion of the shaft;
• and
• a wedge lock assembly comprising a clamp block, a wedge member having a first face configured to slidably engage the housing half second edge portion and an opposite face configured to slidably engage the third seat surface of the associated end portion of the shaft, and an elongate connector adjustably connecting the clamp block to the wedge member and configured to controllably adjust a distance between the clamp block and the wedge member, whereby the wedge lock assembly is configured to clamp the associated end portion of the shaft between the wedge member and the first edge portion of the housing half.