The Correlation Between the Accuracy of Hole Machining and the Accuracy of Angles of the Reamer Cutting Edge

The influence of the accuracy of machine reamer geometry on reaming of holes is considered in this article. It is shown that inaccuracies in the cutting point angle and the tooth pitch angle within one tool lead to changes in the thickness and width of the chips cut by a single tooth of the reamer.  The changes in the chips are caused by the differences in the cutting forces acting on each tooth. It results in the occurrence of a total unbalanced radial force that tries to change the position of the tool axis, which impacts the accuracy of the machined hole. The influence of the total unbalanced radial force on the accuracy of the holes can be assessed by the total errors of the angular parameters of the tool working edges, represented in the vector form.  The author determines experimentally the influence of the total errors of the cutting edge angles on reaming when using tools with minimal total errors of the tooth pitch angles. The influence of the total errors of the tooth pitch angle on reaming with minimal total errors of the angles of the reamer cutting edge is also determined by this study. The empirical dependence of hole widening on the joint influence of the total errors of the cutting edge angles and the tooth pitch angles is determined.

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