4. HOW TO SELECT CHAINS In this chapter, we outline the selection process. To choose the right chain, follow the step-by-step procedure for the type of line you’re running. The first thing you must determine is the type of application: power transmission or conveyor. The selection process differs for the two applications; see Basics Sections 4.1 and 4.2. In addition to the procedures described in this book, chain manufacturers usually provide comprehensive selection charts in their catalogs; refer to the manufacturer’s catalog for detailed information. 4.1 TRANSMISSION CHAIN SELECTION There are four main uses for transmission chains: power transmission, hang- ing transmission, shuttle traction, and pin-gear driving. 1. Power transmission. The most frequent application, power transmission involves an endless chain wrapped on two sprockets. There are two ways to select chains for this use. For general applications, you can select by power transmission capability (tent curve). This is shown in Figure 4.1. For slow-speed operation, you can make an economical selection using the maximum allowable tension. Use this method when chain speed is less than 50 m/min. and starting frequency is less than five times/day (Figure 4.2).
With Catenary
Without Catenary
Tensile Strength
kW
Max. Allowable Load
1
10 7
Small Sprocket (rpm)
Number of Cycles
Figure 4.1 Power Transmission Capability
Figure 4.2 Maximum Allowable Load at Slow Speeds (less than 50 m/min.)
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