Calculating Conveyor Speeds

The standard speed for most unit handling conveyors is 65 FPM (feet per minute) which works out to the average speed a person walks when carrying a 50-pound box. This pace is ideal for many—but not all—order picking and assembly operations. There are always situations where transport through an area, into a process, or toward a packing operation can be accelerated. For the majority of conveyor types, you can opt to slow your system, or increase its speed above 65FPM. What are some factors for changing the speed of your conveyor?

You may need higher horsepower

Horsepower ratings are calculated according to the standard speed listed for that conveyor. When increasing the speed, more horsepower may be needed to drive the load. As a rule of thumb, it takes twice as much horsepower to move a given package at 130 FPM than at 65 FPM. The formula below may help to determine the approximate power requirements :

Horsepower in chart (based on 65 FPM) x DESIRED SPEED (In feet per minute)/65

Example:

• Model TA, (a slider bed conveyor) 11' long requires 1/2 Hp motor at 65 Feet per minute for a total load of 320 pounds.
• You desire your conveyor to operate at 90 Feet Per Minute.
• Calculate as follows: (1/2 X 90) / 65 = .69
• You should select the next highest horsepower or 3/4 Hp.

This formula should provide you with a good estimate, but it's always best to confirm it with conveyor experts. Ask us to do a complete horsepower calculation if this causes any concerns.

Higher speeds are tougher on conveyors

The service life of a conveyor running at a higher speed may be shortened considerably. Most conveyors are not designed to run over 200 FPM. When they do, some parts may need to be balanced to prevent excessive vibration, and special bearings may be required. The type of belting used on a conveyor may also need to be considered.

Pallet conveyors are different

Pallet handling conveyors generally operate at 30 FPM and 30 may be substituted in the denominator of the formula.

We can help you figure it out

If you have questions, contact us. Cisco-Eagle can help you determine the right speed, horsepower, and other specifications for your conveyor.