CNC grinding machines Comprehensive portfolio of CNC tool grinding machines and CNC grinding machines for component manufacturing, cylindrical and profile grinding. Since 1923, SCHNEEBERGER has been developing and building high-precision CNC tool grinding machines for the production and regrinding of cutting tools and production parts. Valve Refacer Dressing Diamonds. Sioux Valve Refacer Replacement Belts. Small Valve Chuck .125 to .250 (3mm to 6mm) Regular price $275.00. Sale price $219.00. Valve Refacer Oil - 1 Gallon. $34.50.