Used CNC Tube Benders for Sale
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About Used CNC Tube Benders
A CNC tube bender bends tube to a program. The carriage sets how far the tube sticks out. The rotation sets the plane of the next bend. The bend head wraps the tube around a die to a radius and an angle. Eaton Leonard and Addison are names that repeat. A manual draw bender without those axes is a different machine. Stacked tooling, when the head has it, lets two radii live on the machine. One radius is the simple case.
Capacity is the largest tube the clamp and the mandrel were built for, in diameter and wall. A thin wall in a tight radius needs a mandrel and a wiper die or it will wrinkle and collapse. The centerline radius is the die, not a setting you invent. Bend, rotation and carriage are the minimum axes. A pressure die and a clamp die have to match the tube. Springback is a correction in the program, and a control that cannot store it will make you chase every part.
The mandrel extractor, the hydraulics and the encoder on each axis are the wear. A bend that is short by a degree is an encoder, a cylinder or a die that has slipped. A wrinkle in the throat is a mandrel that is not reaching, or a wiper that is worn. Collets and clamp dies are tooling and they are often not the size you run. The control has to boot and has to hold the part files. A bender with a dead control is a bend head.
A used CNC tube bender should be bent on your diameter and your radius, not only jogged. Watch the inside of the bend for a wrinkle and the outside for a flat. Confirm the axes, the largest tube and whether the dies in the crate are your radius. A machine tooled for one exhaust size will not bend your handrail until the tooling changes, and that tooling can cost as much as the difference in the frames. Match the die to the print before you match the brand.
How to Choose a Used CNC Tube Bender
Radius and Mandrel Before the Brand
The bend die is the radius. If that die is not with the machine and you cannot get one, the bender does not make your part. The mandrel, wiper, and pressure die are what let a thin wall survive a tight centerline radius.
Eaton Leonard and Addison are the names in this range. The control has to store the bend. An end former is the other group, for a bead or a flare, and it will not replace this arm.
Stack, Springback, and a Real Bend
More than one radius on the same tube wants stack tooling or a tool change you are willing to live with. Springback means you will correct the program against a measured angle, so the control has to let you do that.
Bend your tube. An air cycle of the carriage does not show slip, wrinkle, or a mandrel that is scored. Also walk the swing of the arm. A bender that does not fit the bay is not a spec you can edit later.
CNC Tube Bender Specs to Compare
| Spec | Why it matters |
|---|---|
| Tube diameter and wall | Diameter without wall, or a thin wall on a tight radius, changes the machine you need. |
| Centerline radius | No die, no radius. Confirm the tooling, not only the arm. |
| Mandrel and wiper | They keep the tube from collapsing or wrinkling. A bare bend die is not a complete setup. |
| Stack or multi-radius | A part with two radii needs the stack or a tool change you accept. |
| Axes | The tube has to locate in space, not only curl. Lost axes scrap the part. |
| Control | A bender you cannot program to your print is a fixture, not a CNC machine. |
Tube diameter and wall
Diameter without wall, or a thin wall on a tight radius, changes the machine you need.
Centerline radius
No die, no radius. Confirm the tooling, not only the arm.
Mandrel and wiper
They keep the tube from collapsing or wrinkling. A bare bend die is not a complete setup.
Stack or multi-radius
A part with two radii needs the stack or a tool change you accept.
Axes
The tube has to locate in space, not only curl. Lost axes scrap the part.
Control
A bender you cannot program to your print is a fixture, not a CNC machine.
What to Inspect on a Used CNC Tube Bender
Bend your diameter and radius
Look for collapse, wrinkle, and slip. An empty cycle of the arm does not count.
Confirm the dies are present
Bend die, clamp, pressure die, mandrel, and wiper for your tube. A missing die is a second purchase.
Home the axes
Carriage, rotation, and bend arm should find home and repeat. A lost encoder ends the part.
Measure springback
Program an angle and measure it. The control should let you correct. If it cannot, the part cannot.
Inspect the mandrel
Scores and a bent nose mark every tube. Lubrication passages should be open.
Check clamp slip
A scarred tube or a short bend often means the clamp or the pressure die is not holding.
Walk the swing
The arm and the tube need a clear bay. Measure it before the rigger is in the driveway.
Related Equipment
- Tube & Pipe Benders
Parent group for benders and end formers together
- Tube End Formers
Bead, flare, and reduce, after or instead of a bend
- Band Saws
Cutoff of the tube before it reaches the bender
CNC Tube Benders Brands We've Sold
Common Applications
Frequently Asked Questions
What does the mandrel do on a CNC tube bender?
It supports the inside of the tube while the bend die pulls the outside around the radius. Without it, a tight bend in a thin wall collapses or wrinkles. The wiper and the pressure die work with that mandrel, and a missing piece of that set is not a complete bend. A scored mandrel will print into every part. Confirm the mandrel matches your diameter and that it is actually with the machine. A rotary-draw arm alone is not a mandrel bender yet.
How do I read centerline radius on a CNC tube bender?
The bend die is the radius. The print calls for a centerline radius, and the die either matches it or it does not. A machine rated for a range of diameters still cannot invent a die that is not in the crate. Ask which radii are included before you compare controls. Springback means the finished angle needs a correction in the program, and that is separate from which die is mounted. Bring the print. A photo of the arm will not answer the radius.
Can a CNC tube bender hold more than one radius?
When it has stack tooling, two or more radii can sit on the machine and the program can move between them. Without a stack, a second radius is a tool change. Parts with one radius do not need the stack, and parts with two radii are painful without it. Confirm what is actually on the machine, not what the model can be ordered with. The control has to know those stations. A stack that does not index is a single-radius bender with extra iron.
What should I check for springback on a CNC tube bender?
Bend your alloy and measure the angle against the program. The difference is springback, and the control should let you compensate. A machine that cannot store that correction will not repeat the part. Material and radius change the number, so a demo in a different tube is only a hint. Also watch for slip in the clamp, which shortens a bend and can be mistaken for springback. Measure. Do not argue with the arm.
Which dies have to come with a CNC tube bender?
The bend die for your radius, the clamp, the pressure die, and, for a tight thin-wall bend, the mandrel and wiper. If those pieces are not in the sale, price them as a second purchase before you call the bender complete. Diameter has to match. A die for a neighboring size is not close enough. Eaton Leonard and Addison machines here still follow that rule. The brand does not replace the tooling list on the print.
How is a CNC tube bender different from an end former?
A CNC tube bender makes the radius along the tube. An end former beads, flares, reduces, or expands the end and does not change the centerline. Shops often own both, in that order, and the groups are split so the tooling conversation stays honest. Buying a bender to put a bead on a straight tube is the wrong crate. Buying an end former to make an exhaust bend is the same mistake in the other direction. Read the print and open the group that matches the callout.
