Abstract
CNC machining center is the biggest breakthrough in manufacturing industry. In three axis machining center total 21 geometric errors exist. Different techniques are used to improve machining accuracy thereby different compensation techniques has developed with time. Direct and indirect measurement methods are used to measure errors in machining center. Aim of this study is to analyse13-step diagonal or 13-sequential method to measure the error values in machining center by using interferometer by taking measurements on 13 lines. Measurements on twelve lines are measured by 12- line method but thirteenth line is measured by using step diagonal method along a body diagonal of machining center by moving one axis at a time. Experiment is done on machining center in three ways (1) without giving compensation (2) with lead screw compensation and (3) with 13-step diagonal method compensation. Two verification experiments are conducted (a) by using interferometer and (b) by manufacturing a designed part on machining center. Later manufactured part is measured on CMM before and after giving compensation. It is expected that the accuracy of machining center may improve error considerably. Errors along body diagonal are measured by using direct measurement which is more accurate and can give better results.
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