Sizing and Deflection FAQs
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What is the best way to size an idler to minimize deflection?
The best way to size an idler is to use the WINertia Calculator. This online tool lets you input five variables and it then recommends the best idler to use for your application. It is very quick and easy to use. If you have any questions about your application, you can contact one of our Idler Application Specialists at 608-884-2201 or email: firstname.lastname@example.org.
What is a Class B roller deflection?
The Class B roller deflection is an industry accepted deflection level used when calculating a dead-shaft idler. The allowed deflection in the center of the roller is equal to or less than .00015 x the length of the idler roll.
When determining web tension what is the difference between PLI and total pounds of tension?
PLI is the pounds per lineal inch of web length. To get PLI you divide the total web load in pounds by the length of the web.
How does web speed affect the sizing of idler shaft diameters?
Web speed affects the sizing of idlers by matching the shaft diameters for various web speeds. The higher the web speed, the more need there is for shaft strength and stability. For example a 5” WINertia idler 70 inches long with a 75 inch shaft length may be just fine at 200 feet per minute web speed with a 1” diameter shaft. If the web speed were increase to 1,000 feet per minute, a 1.25” diameter shaft would work better for this application.
If the shaft length was increased to 80 inches and the web speed increased to 2,000 feet per minute, then a 1.5 inch diameter shaft would be a better option. If you have any questions about sizing an idler, you can contact one of our Idler Application Specialists at 608-884-2201 or email: email@example.com.