Tooling
Marine Supplier Meets Tricky Tolerances With Presetter And Measuring Machine
For its supercharged six-cylinder Verado outboard motor range, Mercury Marine (Fond du Lac, Wisconsin) set and met multiple new tolerances. One of the trickier tooling tolerances had to do with the valve seat boring tools. The company's Mazak machining centers incorporate 15 of these long, narrow, multi-insert tools to finish machine the 24-valve seats, intake and exhaust in the one-piece aluminum cylinder head. Because valve clearances are factory-adjusted and are designed to remain within tolerance for several thousand hours, close machining tolerances are essential.
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