Most palletizing projects fail to reach the rated output not because the robot is weak, but because one of the supporting parameters was not confirmed during selection. Before comparing prices, collect these seven data points from your line.
1. Payload includes the end effector
The rated payload of a palletizing robot is measured at the tool flange. A clamp gripper typically weighs 60 to 120 kg, so a line handling 40 kg cartons needs a robot rated well above 40 kg. Always ask the supplier to state the net payload after the gripper weight is deducted.
2. Reach must cover the pallet and the infeed
Measure the distance from the robot center to the farthest corner of the pallet, then add the distance to the picking position on the conveyor. A 1200×1000 mm pallet with a single infeed position usually needs a working radius of 2,600 mm or more.
3. Cycle time is not the same as robot speed
The published joint speed describes an unloaded point-to-point move. The real cycle depends on the pick height, place height, layer pattern and product stability. Ask for a cycle time simulation based on your own pallet pattern before signing the contract.
- Single pick, single place: shortest cycle, one carton per stroke
- Multi-pick: vacuum head takes two or four cartons per stroke, higher output but heavier tooling
- Layer forming with slip sheet: adds 4 to 6 seconds per layer
4. Repeatability affects stack quality
For stable stacks, ±0.5 mm repeatability is sufficient for cartons and crates. Bagged products need a shaping station more than higher robot accuracy, because the bag deforms during transfer.
5. End effector decides what you can handle
Clamp grippers suit rigid cartons. Vacuum heads suit bags, flat cartons and shrink-wrapped packs. Hybrid tooling is required when one line runs mixed SKU. Confirm the changeover method and time if you run more than ten product types.
6. Safety layout is part of the price
A palletizing cell needs a fence, light curtains at the pallet entry, emergency stops and a safety PLC. Ask whether the quotation includes the safety system or only the robot body, and confirm which standard the supplier builds to for your destination market.
7. Controller communication must match your plant
If the line will exchange data with a WMS or MES, confirm the supported protocols in writing: Modbus TCP, Profinet, EtherNet/IP or OPC UA. Retrofitting a communication module later is more expensive than specifying it at the start.
Send us your carton dimensions, weight, target output and a simple layout drawing. Our engineers will return a configuration proposal with a cycle time simulation within 24 hours.
