An analysis of AL-60 airleg maintenance data

CIM Bulletin, Vol. 78, No. 875, 1985

E.B. WILSON, Emeritus Professor, Mining Engineering Department, Queen's University Kingston, Ontario, Canada, R. FRANK CHIAPPETTA, Technical Representative, Atlas Powder Company Tamaqua, Pennsylvania, U.S.A.

The maintenance records for AL-60 airlegs at Falconbridge Ltd. are used to demonstrate some of the procedures for the analysis of such data. The data are not representative of pure failures of one type or another. In fact, the records are for the undefined pseudo-failures which are usually found in industrial operations. However, because the machines are brought to the shop only when inoperative, the individual recorded components are treated as failures. Manual calculations are conducted to show the analysis of variance (ANOVA) approach to determine whether certain data can be combined; only a limited number of the 206 machines being considered. The manual procedures continue with the weighting of the suspensions; i.e. terminations for reasons other than the failure of the given component. After the data are sequenced in the proper order, the nature or pattern of the data is determined using the Kolmogorov-Smirnov (KS) test. It is recognized that these manual examples must be replaced
Keywords: Maintenance, Equipment, Airleg drills, Rock drills, Underground mines, Data analysis.