Abstract: According to this invention, two band saw grinder units are constructed in paired relationship, spaced apart, and arranged to receive two band saw bands suspended from overhead supports which will permit the bands to move up and down for the grinding operation instead of horizontal as in the prior art. The grinder units are controlled and powered from a central mechanism located in the area between the units, while the bands are supported in an area outward from the area occupied by the central control mechanism, avoiding conflicting occupancy of the various parts. Novel construction and improved means for adjusting the linkage required for accurate grinding of one or two blades at a time are outstanding features of the invention.

Abstract: Rotary cutting tools normally throw out chips and other particles from the surface or edge being cut. According to this invention, an exhaust hood, arranged to be connected to an exhaust system, having a bristle skirt is mounted to enclose an area about the tool, a strong jet of air from a jet nozzle put through the hood is directed toward the cutting portion of the tool and at the stream of chips being thrown off to disburse all of the chips and particles up into the air stream being exhausted from the hood causing them to become airborne. The air stream entering the hood through the interstices in the skirt and rushing across the hood and out through the exhaust port will so completely capture the airborne chips and particles that none will escape into the general atmosphere of the machine room.