Sheave Alignment: Aim Small, Miss Small

A belt driven fan has a laser tool mounted to it to perform a sheave alignment.

A customer recently called saying his Belt Hog Sheave Alignment Tool was out of calibration. He stated that when he placed the Belt Hog lasers in the sheave grooves, they showed a slight amount of misalignment. However, when he rotated the lasers 180 degrees to check, there was a variance of 3mm (0.118”). While this…

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