eh@boss.iele.polsl.gliwice.pl , . . ' $ 1 I . '.' ' I .Abstract-. The paper presents the consideratibns relating to the ways of analysis of laddei diagram'created~for small programmable controller (PLC) compact.type which is equipped with simple keyboard for entry of such diagram. Because of the fact that compact PLC was built with using'of standard microcontroller which calculation i)ower is small the authors met difficulties with translation of the control program to the binary code. It was necessary to make decision that a ladder diagram will be not compiled but interpreted during program execution. The method of column by column analysis of ladder diagram was chosen as the most effective. The particular application of this method for small compact PLC is presented in details in the paper.. , .~

Machine accuracy of workpiece is dependent on a number of factors including the machine spindle nose position. Recently, the application of thermal phenomenon especially in electrospindle has been of great interest. Thermal displacement of the spindle nose affects the accuracy of machining and it also depends largely on the amount of power loss in the bearings. This paper presents the angular contact bearing model which takes into account the stiffness of spring stacking. The result show what effect does the stiffness of the spring stacking have on axial force, contact forces and displacements of angular contact bearing. Moreover, omission in the analysis of the stiffness of the spring stacking result in errors in the estimation of the position on the spindle nose due to the deformation of the elastic spring.

No abstract

No abstract