Minimizing runout is crucial when reaming. Consider a 12.7 mm (0.5") reamer with 0.0127 mm runout. The 0.0127 mm runout would cause the tool to create a 12.7254 mm (0.501") circle when rotated. It can be difficult to maintain a 0.0254 mm (0.001") tolerance when the runout of the tool drives the cutting edge past the upper end of the tolerance ...
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