What's not to like about a machining process that hits print tolerances with adjustment-free, 1.67 Cpk capability, while running 4000+ parts per day, six days a week? That kind of worry-free production of 50-micron roundness and 80-micron total tolerance made a Sunnen VSS-2 Single Stroke® honing system the process of choice for Cloyes Gear and Products in machining VVT(variable valve timing) stator bores for OEM automotive customers. The new four-spindle machine came on line at Cloyes' Subiaco, Arkansas, plant in early 2009 to replace a roller burnishing process that struggled to hit print tolerances. The new machine simplified the sizing of the segmented bore, eliminating a high scrap rate and headache for the plant.