Design, Manufacturing, and Calibration Process of One Piece Lathe Dynamometer for Measurement in Two Axes

Abstract

Many pieces in structure of a dynamometer may negatively affect the accuracy of the measurements since each piece may display a different strain and stress depending on its material and construction. A one piece dynamometer has been designed to eliminate these negative effects and to facilitate reliable force measurements. A dynamometer that its dimensions were confirmed following strength calculations was manufactured and calibrated in two different ways. The first one was multipoint calibration method in which certain loads were applied to the dynamometer and strain values corresponding to these loads were matched. The second calibration method was implemented using Kistler dynamometer that its results are accepted to be accurate by everyone and it was based on equivalency of force values resulted from work piece processing and force values resulting from machining work pieces with the same parameters to the manufactured dynamometer. The manufactured dynamometer was capable of measuring cutting forces and feeding forces.

A High Performance Sensor for Triaxial Cutting Force Measurement in Turning

“…To date, much more effort is dedicated to strain gauge and piezoelectric sensors because of their high stability and favorable performance. For example, Ergun Ates and Kadir Aztekin developed a one piece lathe sensor for measuring cutting forces in two axes based on strain gauge [ 11 ]. The sensor possesses favorable measuring error (≤3.75%), but it was only capable of detecting two of the three cutting force components and the author did not clarify the cross-interference between the measured cutting forces.…”

Review on sensor design for cutting force measurement

“…The error percentage between the theoretical and experimental values was less than 5%. 54 This one-piece dynamometer can measure the cutting force after performing the calibration. The static and dynamic cutting force was measured with a strain gauge and accelerometer 55 in an ultra-precision lathe.…”