PCL Group application engineering, Jinan · Updated 20 October 2026
Most plate shops start with an enclosed sheet laser on a 3 × 1.5 m or 4 × 2 m exchange table. The gantry laser comes in when the plates get longer: bridge girders, crane rails, ship and tower plates, full mill plates of 3 × 8 m or 3 × 12 m. This guide works through the questions we ask every customer who is considering one.
Look at the last three months of work, not the next big project. If more than an occasional plate is longer than about 6 m, or if you are cutting large plates into pieces on another machine just so they fit the laser, a gantry will pay for itself in handling time alone. If almost everything fits on a 4 × 2 m sheet, a standard sheet laser is faster to load, takes less floor space and costs less.
| Typical work | Machine that fits |
|---|---|
| Sheets up to 4 × 2 m, thin to medium thickness | Enclosed sheet laser with exchange table |
| Plates longer than 6 m, or full mill plates | Gantry laser |
| Long narrow parts: girder webs and flanges, stiffeners | Gantry laser |
| H-beams, channels and angles | H-beam laser |
Size the bed to the plates you buy, not to the parts you cut. A 3 × 12 m bed takes a full 12 m plate in one load and avoids a second positioning. If you buy 8 m plates today but expect longer ones, a longer bed is cheaper now than an extension later. PCL gantry lasers are built with working lengths up to 12,000 mm.
Choose power for the thickest plate you cut every week, not the thickest you might cut once a year. Extra power mostly buys two things: speed on medium plate, and the ability to cut thicker carbon steel with air or nitrogen instead of oxygen, which gives a clean, oxide-free edge for welding and painting. PCL offers gantry lasers from 1 kW to 30 kW. Send us your thickness mix and we will run your parts as a test before you decide.
We fit IPG, Raycus or Maxphotonics sources. The cutting result between them is close at the same power. The differences that matter after five years are price, local service and how fast you can get a spare module. Ask who supports the brand in your country before choosing.
Long machines lose accuracy when the gantry is heavy, the drive is single-sided or the bed moves. These are the specifications we build to:
The aluminium gantry keeps the moving mass low, so the machine can accelerate hard without shaking the bed. Driving both ends of the gantry keeps it square at speed. Stress-relieving the welded bed stops it from slowly moving after installation, which is a common cause of accuracy drifting in the first year.
Full plates go on by overhead crane or vacuum lifter. Check that the crane covers the whole bed and that there is room to lay down a plate beside it. Unloading is the step that usually limits output on a long bed: plan where cut parts and skeletons go, and how they are sorted, before the machine arrives.
On a long bed, extraction has to follow the cutting head. PCL beds have partitioned extraction, so only the zone under the head is opened. That keeps the suction strong where it is needed and the workshop air cleaner for the operator.
Many shops run both: plasma for thick, rough work and laser for parts that must fit. See the gantry CNC plasma cutting machine and gantry plasma bevel cutting. Full specifications of the laser are on the gantry CNC laser cutting machine page.