Black & Decker®, Kwik-Way®, Rottler®, Sioux®, and Snap-On® valve regrinding machines may have pad refacing fixtures. However, none of them have a “pantograph” function to contour the rocker pallet to a specific radius, nor is the stovebolt radius known. The curvature of the new surface is entirely the product of operator skill.
The machine’s fixture does help, in that the rocker arm is held on a shaft at 90° to the grinding wheel to prevent incorrect motion. The desired result is a 2-dimensional wave, not a dome with a curve in both axes. As long as the pressure is light and constant, and the sweep across the radius doesn’t stop, a competent result can be achieved.
