Buyer Brief
A conveyor cannot be sized from kilograms per hour alone. The design needs the individual load, load distribution, conveyor geometry, speed profile, starts per hour, station cycle, accumulation, transfer movements, and peak operating scenario.
In This Guide
Separate unit load from throughput
Unit load is the mass and geometry carried at one position. Throughput is the number of units or total mass moved over time. Two lines with the same hourly output can impose very different drive and frame demands when pallet size, spacing, acceleration, and accumulation change.
Record the normal unit, the heaviest unit, and any off-center or unstable condition. Include fixtures, pallets, trays, packaging, and temporary tooling in the stated payload.
Calculate the real operating cycle
Conveyor travel time is only one part of the cycle. Add sensor confirmation, stopping, locating, process dwell, lift or rotation motion, release, and downstream availability.
Use both average and peak demand. A line may run comfortably at the average rate but fail to recover after a short downstream stop if no buffer or recovery-speed margin has been planned.
Identify the worst credible case
Sizing should examine maximum simultaneous load, the longest loaded incline, the highest number of starts, and the condition created by a blocked downstream process. Also review how friction, wear, temperature, and contamination can change resistance.
The supplier should state which inputs were used and which remain assumptions. Final motor, gearbox, belt, chain, roller, and structural selections should be confirmed against the approved project data.
Data that belongs in a sizing sheet
| Data group | Minimum input | Common omission |
|---|---|---|
| Load | Normal and maximum unit mass | Fixture and pallet mass |
| Geometry | Length, width, height, support points | Center of gravity |
| Motion | Speed, acceleration, starts, reversals | Recovery operation |
| Flow | Takt time, spacing, accumulation | Peak queue length |
| Environment | Temperature, dust, moisture, cleaning | Change in friction |
Recommended Project Workflow
Define one unit
Document complete dimensions, mass, support, and stability.
Build a time budget
Add every transport, stop, process, and release event.
Test the peak case
Model maximum loading, downstream blockage, and restart.
Approve margins
Ask the supplier to identify design margins without presenting guesses as ratings.
Frequently Asked Questions
Should conveyor speed equal the required production rate?
No. Production rate depends on spacing, station time, availability, and control logic as well as travel speed.
Why does center of gravity matter?
A high or offset center of gravity can affect stability during acceleration, curves, transfers, stopping, and rotation.
How should variable products be handled?
Define a design envelope with minimum, maximum, and worst-case products, then identify any recipe or changeover requirements.
Is average payload enough for motor selection?
Usually not. The maximum simultaneous load and operating scenario are more useful inputs for engineering review.
What should be witnessed during testing?
Use representative loads to verify travel, stopping, transfers, fault recovery, and the agreed cycle under defined conditions.
Planning a Conveyor Project?
Send the product, load, throughput, layout, environment, controls, and destination requirements for an engineering review.
