Tube Cutting vs Tube Bending
Cutting shapes the ends of a tube so a joint closes. Bending puts a curve into the tube itself. A request that leaves the difference open gets the wrong scope.
Tube work gets described loosely, and the loose description costs time. Cutting and bending are different operations with different machines, and a request that does not say which it needs cannot be quoted properly.
Cutting shapes the end
The Dragon A400 cuts tube, pipe and small structural profiles to a programmed shape. That means square ends, saddle cuts, cope joints, holes and notches, all from the same program, with assembly marks engraved or marked as it cuts.
The point of a shaped cut is the joint. A saddle cut on a tube that meets another tube lets the pair close up with minimal gap, so the weld is a joint rather than a filled gap. On a run, every piece gets the same cut because it comes off the same program.
Capacity on the machine runs from 3/4 in to 6 in round outside diameter, and 1 in to 4 in on square, rectangle, angle and channel, with material up to 25 ft long and a 400 lb load on the machine.
Bending curves the tube
Bending puts a radius into the tube. It is a separate operation with its own tooling, its own springback behaviour and its own limits, and it happens to the tube rather than to its ends.
The A400 does not bend. It cuts. If a component needs bends, the request has to say so, because a bend changes the length of the part that arrives at the cut, and it changes the order the operations happen in. A cut length dimensioned from a straight tube is not the same number once a bend is introduced.
Stating the scope in a request
Answer these four in the request and the scope question answers itself:
- Does the component have bends, and if so, are they part of what you are asking for?
- Are the ends square, or shaped for a joint that closes.
- What are the tube sizes and the wall thickness, and how many lengths.
- What are the holes, notches and marks that have to be in the cut.
Why this matters at review
A request for cut tube with cope joints and a request for a bent tube frame both describe tube. One is a cutting package that can be quoted from a parts list and a joint detail. The other needs the bend geometry resolved before the cut lengths mean anything. Saying which one you need at the start removes the round of questions.
Preparing tube components for a welded frame covers what to send when the cut pieces feed an assembly.