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Stierli 420 CNC Horizontal Bender

Fast, Powerful and Precise Copper Bending


The Stierli 420 CNC is an efficient horizontal bending machine for a variety of straightforward and repeatable applications where considerable power is demanded. With 420 kN (46 US tons) of working power, it can be programmed and operated with an easy-to-use modern touchscreen color display with 2-axis control. Bending angles and segments can be programmed and adjusted after the bending operation. Stroke setting can be adjusted in the program at any time in +/- 0.1° increments to offset material-related variances. Up to 200 programs can be saved and other programs can be swapped in via an interface.

The Stierli 420 CNC’s jogging, automatic and straightening modes are operated with a foot switch or manual control cable. A 130 mm tool holder and 80 mm diameter pin provide a versatile and convenient tool mounting system. The machine table has three additional tool holes for pipe bending or straightening.

Stierli 420 CNC bending machines come standard with a large working plate, ensuring effective positioning of very large bent parts. The machine features a special oil-lubricated guided cylinder which requires little maintenance and no open guide. It can be transported easily inside a factory with a crane or pallet truck.

The Stierli 420 CNC also can be built to include optional automatic measuring and re-bend capabilities to give perfect bends regardless of material characteristics. With the automatic measuring tool and associated software, spring-back data is calculated from bending tables stored in the control and can be added to or edited as needed. For each bend, the Stierli 420 CNC copper bar bender makes the initial bend, measures and then re-bends each piece – assuring maximum process reliability and precision. The required stroke and spring-back compensation are each calculated by the control to achieve the best possible accuracy. In addition, the length before bending and the stop positions are calculated automatically.

Two tool trays provide organized storage of the tools so that they are always available.

Stierli 420 CNC Copper Bar Bender Technical Data

Working power
Tooling height
Bending capacity flat
Straightening capacity
Pipe bending
Round bar
Program memory
Measuring precision
Cylinder stroke
Smallest U-bend with narrow section punch
Cylinder speed
Motor power
42 to / 420 kN
200 / 20 mm
HEA 180
3/8" - 2"
ø 45 mm
Simple CNC
+/- 0.1mm
0 - 200 mm
45 mm
0.60 m/min
5.0 kW
3 x 400 V / 50 Hz
1100 / 800 mm
46 Tons
8” x ¾”
7” x 7” H beam
3/8" - 2"
Simple CNC
0 – 8”
24 ipm
6.5 HP
3’ x 6’
2,000 lbs
Move with pallet jack

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