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Hello Mike Pl refer to photo showing 4 step reamer. We have a HMC for doing 6 injector bores in cylinder head (which is a casting component) thro 4 step reamer of diameters 8.5,17.23,21.26 and 26.076 mm respectively. There is an observation that after changing tool, we find chattering randomly in any of the 6 bores for dia. 26.076 mm for about 2 to 3 components and then gets ok on its own. Bore depth is approximately 100mm Can you please advice for this random behavior as well as for chattering? Regards Rishikesh