Figure 15-6 indicates the way to measure chain pitch. Using a steel tape measure, measure as many pitches as possible (at least four are required). Measure length (A), (B), or (C) as shown in Figure 15-5, depending on the wear condition of the chain. The chain pitch elongation per link is determined by comparing the actual pitch to the original chain pitch.
Figure 15-6: Measuring Chain Pitch
Sprocket Life When the sprocket is worn, chain tends to cling to the sprockets and vibrate. The amount of allowable wear depends on the conveyor type and chain size. Generally, wear to a depth of 3 to 6 mm (0.12 to 0.24 in.) is a sign that the existing sprocket should be repaired or replaced to ensure continued chain life. The following measures can extend sprocket life: 1. Cut section (A) shown in Figure 15-7 with a grinder. 2. Reverse the sprocket to change the engaging area of the teeth. 3. Use a welding rod to obtain the correct tooth profile. However, it is generally more effective to replace the sprocket with a new one.
Figure 15-7: Sprocket Wear
If the sprocket teeth are worn as shown in Figure 15-8, sprocket alignment may be incorrect. Proper axial alignment of the sprockets will help reduce or eliminate this type of wear.
Figure 15-8: Sprocket Tooth Wear
28 I NSTALLATION & M AINTENANCE
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