Application of a Ballbar Fordiagnostics of CNC Machine Tools

Abstract

The article describes modifications to the effector of a manipulator arm proposed in order to increase the accuracy of jaw force measurements. Gripping force measurement is performed using strain gauges. Their proper positioning and connection minimize not only the influence of the position of the centre of gravity of the manipulation object on the jaws but also the effect of temperature changes around the measuring area. The possibility of altering the magnitude of gripping force was incorporated into the robot control application. This greatly increases the security of handling and increases the number of items that can be possibly gripped. Modified effector parts were subjected to stress analysis, with emphasis on the elimination of stress peaks that would not occur in real parts. The article also describes the design of the mechanical modification of the effector, which would allow the continuous rotation of the jaws of the effector.

Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness

“…Publication [24] presents a methodology for predicting component accuracy based on circular interpolation and the FE model. The use of the Ballbar, a measuring device and the circular interpolation test for the diagnosis of three-axis machine tools is described in [25] and the use of circular interpolation for measuring the geometric errors of five-axis machines is described in publication [26]. Roundness error has not been improved.…”

Numerical Solution of an Interval-Based Uncertain SIR (Susceptible–Infected–Recovered) Epidemic Model by Homotopy Analysis Method

“…by solving the linear higher-order deformation Equation ( 15) using the well-known symbolic computation software such as Maple, Matlab, or Mathematica. Prediction and controlling the infection was studied in detail not only in [22] but also in other papers, for example [4,[23][24][25][26][27][28][29][30][31][32][33][34][35][36]. We discuss in the next section the homotopy analysis method.…”

Machine Tool Accuracy DMG MORI DMU 50 measuring by system Ballbar QC20-W

“…It achieves this with a very precise linear encoder and a pair of spheres at both ends. Precise magnetic dishes are used in the measurement, one of which is fixed to the spindle (or casing) of the machine and the other to the worktable of the machine, between which the balls are placed cinematically [8,9]. Thanks to this, the system can measure even small changes in the radius of the programmed machine path.…”

“…[3,8] If we want the machine to be reliable, able to produce portable parts in the required quality, in the long term, then in addition to regular maintenance, it is also necessary to regularly monitor changes in its accuracy. This is done by the following tests [5,9]: -measurement of vibrations of rotating devices; -measuring the positioning accuracy of the machine; -circular interpolation measurement; -clamping force measurement;…”