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Approach to feed drive load measurements in heavy turning

Medyk Pawel, Kasprzak Marcin

Journal of Machine Engineering

2020

Vol. 20, No. 4

41--58

It is well known that the forces loading the feed axes carry a lot of information about the machining process. The measurement of the forces opens the possibility of implementing such functions as cutting tool condition diagnosis, tool breakage detection and adaptive feed control aimed at maintaining constant loading. Hence inexpensive, but usable in industrial conditions, force sensors are sought for the steerable axes. The article describes a feed drive load measuring system based on industrial force sensors. These are strain gauge sensors located in the ball screw area. The system was designed for compressive and tensile forces of up to 30 kN. The effect of nonaxial forces on the measurement error is examined. The proposed system does not introduce any new elements into the machine structure and requires only its minor modifications. The system was tested in a strength testing machine.

CNC machine tool error compensation system implementation strategies and their constraints

Medyk Pawel, Jedrzejewski Jerzy, Kasprzak Marcin

Journal of Machine Engineering

2019

Vol. 19, No. 4

70--81

This paper deals with the constraints imposed on error compensation systems by their implementation strategies. Constraints stemming from the structure of the control system with an NCK architecture of the ADCBI type are presented. Practical realizations of compensation and potential solutions offered by contemporary commercial CNC controllers are discussed.