Abstract: A portable grinder assembly for use in grinding oversized replacement stator vanes having a high speed air driven rotary carbide cutter situated adjacent a vane support. The vane support is capable of moving the vane in three predetermined directions with respect to the cutter. A tubular guard surrounds the cutter and not only directs cooling air on the cutter and vane during the grinding operation but also protects the operator of the grinder assembly from injury.