A study of pre-travel variation of coordinate measuring machine with different stylus configurations

Ali Saeedan, Ahmed Saeed (2015) A study of pre-travel variation of coordinate measuring machine with different stylus configurations. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

	Text (24 pages) A Study of Pre-travel Variation of Coordinate Measuring Machine with Different Stylus Configurations 24 Pages.pdf - Submitted Version Download (280kB)
	Text (Full Text) A Study of Pre-travel Variation of Coordinate Measuring Machine with Different Stylus Configurations.pdf Restricted to Repository staff only Download (3MB)

Abstract

Coordinate measuring machine (CMM) is one of the sophisticated, most powerful and versatile metrological instruments. CMM measurements are not accurate as they are always subjected to errors due to various causes. Nevertheless, quantifying an error and later uncertainty puts doubts on the validity of the measurement result. Such a probe system is much responsible for the CMM measurement accuracy and the most important parameter characterizing probe inaccuracy is the pre-travel variation. This project studied the influence of using different stylus configurations toward the pre-travel variations and later identify the source of errors and the factors affecting the uncertainty of the measurement. Three factors were evaluated (stylus length, tip diameter of the stylus, and the approach distance) and a full factorial design was adopted for the experimental design followed by an ANOVA analysis to identify the significance of the factors toward the pre-travel variation and the uncertainty of the measurements. The experimental results showed significant effect of the three factors on both the pre-travel variation and the uncertainty of the measurement and there was an interaction between the stylus length and the tip diameter. It was also found that the stylus length has much influence on the results than the tip diameter and the approach distance was the least factor affected the measurements. Moreover, it was found that the increment of stylus length lead to a significant variations of pre-travel and uncertainties while the increment of the tip diameter at the smallest length of the stylus reduced the error propagation. Also, it was found that the smallest approach distance produced relatively higher pre-travel variation and uncertainties.

Actions (login required)

View Item