Measuring Sheave Wear
+10% Oversize New
When there is space on the sides of a +10% Gauge the sheave is too loose and should be remachined.
+10% Maximum New
A +10% Gauge, without any gaps on the bottom or sides, indicates the maximum diameter for a new sheave.
+10% Tight Fit
Use a +6% Gauge to check whether it meets minimum new sheave tolerances.
+6% Minimum New
Use a +10% Gauge to check whether it meets maximum new sheave tolerances.
+6% Minimum New
A +6% Sheave Gauge, without any gaps on the bottom or sides, indicates the minimum diameter for a new sheave.
+6% Tight Fit
Use a +2.5% Sheave Gauge to test if there is excessive wear.
+2.5% Maximum Wear
Test with a +6% Sheave Gauge to check whether it meets minimum new sheave tolerances.
+2.5% Maximum Wear
A +2.5% Gauge fitting without space on side or bottom, means it has reached its maximum wear point and should be scheduled for replacement.
+2.5% Excessive Wear
A gap below a +2.5% Sheave Gauge indicates an excessively worn Sheave which should be removed from service at the next opportunity.