Case study: 400-ton, 6 m plate press brake
Large machines are a different category of project: the building is part of the specification, the rigging is a project of its own, and deflection management is checked daily rather than trusted. This is what that delivery involved.
The requirement
A structural fabricator working connection plates, base plates and long members in thick plate. The part list set the specification: 400-ton class with a 6 m bed, because the defining part was a long member at heavy tonnage — the telecom tower industry page describes exactly this kind of work.
The configuration as built
- Machine: hydraulic plate press brake, 400-ton class, 6,000 mm bed, conventional frame with deep throat for the long members.
- Control: CNC with programmable crowning, so the compensation follows the bend program rather than sitting at a fixed factory setting.
- Sync: closed-loop cylinder control for ram level under heavy off-centre loads — the sync comparison covers why this mattered at this size.
- Tooling: heavy-duty segmented tooling rated for the tonnage per metre the work demanded.
- Documentation: full pack with the rated-load test-bend record along the bed.
What the building needed
- Slab loading: the machine weight at its footprint, checked against the slab — with the load path, not just the average pressure.
- Route in: crated dimensions measured against every doorway, corner and lift on the route from the loading point.
- Lifting: capacity confirmed at both ends of the move, with the machine's rated lifting points used.
- Levelling: position marked and levelled before the machine landed — relevelling a 6 m machine after installation is a project, not an adjustment.
Deflection as a daily discipline
At 400 tons over 6 m, deflection is not a spec-sheet number — it is a daily measurement. The protocol: one long coupon in consistent material at working tonnage, angle measured at several stations along the bed, logged per shift. The pattern of the error is the diagnostic — centre-to-ends gradient points at crowning, one end only points at sync or tooling. The crowning guide has the method, and the maintenance schedule has the log format.
The transferable lesson
Large machines are bought as a project, not a purchase. The building, the rigging and the verification discipline are all plannable in advance — the buyers who plan them get a machine that is productive in week one, and the ones who do not spend the first month solving logistics. The buyer’s guide and the delivery guide cover the checklists in order.
Frequently asked questions
What was the requirement?
A 400-ton class brake with a 6 m bed for a structural fabricator working thick plate and long members — connection plates, base plates and long flanges. The long part at heavy tonnage set both numbers together.
What made this project different from a mid-range delivery?
Three things: the receiving building had to be checked for slab loading and door and route dimensions, the rigging needed planning as its own task, and deflection management became a daily check rather than an annual one.
How was deflection handled?
Crowning compensation verified by test bend at rated load with the angle measured at several stations along the bed, then a daily coupon check in production — the protocol in the <a href='/guides/press-brake-crowning/'>crowning guide</a>. On a 6 m bed at this tonnage, the check is part of the process.
What did the building need?
A slab rated for the machine weight at its footprint, a route in measured for the crated dimensions, and lifting capacity at both the loading point and the final position. All three were confirmed before the order, not discovered on delivery day.
What did this delivery teach us?
That the machine specification was the straightforward half. The building, the rigging and the daily verification discipline are what make a large machine productive — and all three are plannable in advance with the drawings and the floor plan.
Plan a large-machine delivery
Send us the part, the tonnage and the floor plan. We will tell you what the machine needs from the building before it is ordered.