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Engineering Data
Roller Center Spacing
In order to convey your product smoothly and efficiently, it must be supported by a minimum of three rollers. To compute the center to center roller spacing required, divide the length of your package by 3. The dividend is your required spacing. For example, a package 36" long divided by 3 gives a dividend of 12. Therefore, the required spacing would be 12" center to center. Flexible bottom packages require 4 or more supporting rollers per package.
Gravity Roller Rate of Fall Chart
Exact rate of fall should be determined at the time of installation with actual product to be conveyed.
| Product- With Conveyable Underside Surface | Weight Range in Pounds | Fall in 10'0" |
| Cartons | 1 to 5 | 8" to 9" |
| Cartons | 5 to 15 | 7" to 8" |
| Cartons | 15 to 50 | 6" to 7" |
| Cartons | 50 to 75 | 5" to 6" |
| Wood Boxes | 20 to 50 | 5" to 6" |
| Wood Boxes | 50 to150 | 4" to 5" |
| Wood Boxes | 150 to 200 | 3" to 4" |
| Steel Tote Bins | 15 to 50 | 3" to 4" |
Box Tumbling Factors
Grades
Grades recommended here are not exact and should be used only to estimate your requirements. Figures are intended for average conditions, using the proper size roller for materials handled. Additional grade may be required in some cases.
Starting a package from rest on level lines requires a push of approximately 3% of the total load. For heavy loads, a pitch of 18" per foot will reduce push required.
The amount of drop required for 90 degree curves with 4" inside radius is approximately the same as required per 10' section.
Conveyor Angle Chart
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