Select and set up back gauges and correction systems
Here is part 2 of our step-by-step guide to choosing a hydraulic press brake. In the first episode we discussed about length, tonnage, daylight, stroke, throat, tool clamping, and adapters. Now let’s move to two other fundamental systems in a machine, which make our work more flexible and precise: backgauges and compensation systems.
5 — Back gauge
Basics: X-R axis
Bending machines are equipped with a backstop, a motorized structure with a backstop (also known as a “finger”). By placing the sheet metal on the fingers, we determine the bending line. The movement of the backstop along the depth of the machine (i.e. perpendicular to the ram) is called the X-axis. The vertical movement is called the R-axis and is useful when we have a contour with multiple bends.
Use bending stations or different lengths: Z1-Z2 axes
There are at least 2 back gauge fingers to hold the workpiece in place. Their repositioning is usually manual but can be motorized to facilitate work with bending stations or workpieces of different lengths. Movement is along the Z axis (parallel to the bend line), so each backstop is named Z1, Z2, etc.
Conical bends or edges of different depths: X5-X6 axis
For the Z1-Z2 axis we can only bend parallel to the backstop fingers. To do a conical bend, we need to move a finger closer to or away from the bend line, i.e. along the X axis. We can use manual movement or CNC-controlled motorized positioning. The axes are called X5 and X6. With just one electric backstop we can do conical bends up to 75°; 80° in both axes. The X5-X6 axis is also useful if the edge depths of the sheets are different.
Useful if you work with very wide and thin sheets
If you need the utmost flexibility and capacity, we have the Tower Backgauge system, equipped with independent turrets and 6-axes positioning.
Bending by marking
On bends where you cannot use the back gauges, the LaserLine system shines a light beam on the sheet along the bending line.
6 — Deformation of compensation systems
Patented system for proportional compensation of side frame deformation. It eliminates the effects of frame deflection, allowing precise positioning relative to the table. Comes as standard on X-Press press brakes.
Automatic proportional crown system without real-time correction. For 2000mm machines and X-Press Easy only.
Preloaded mechanical crown, no real-time correction.
Gasparini Adaptive Crowning
Patented Gasparini crowning – thanks to special sensors in the ram and in the bench, it measures and compensates for ram deformation in real time. The operator does not need to enter any data; the system actively reacts to different sheet metal behavior.
Gasparini Adaptive Crowning Plus
It’s the evolution of active crowning. A standalone hydraulic circuit allows to reduce energy consumption while improving response time. Included in the ECO+ package.
Learn more about shearing machines, bending machines, and other sheet metal equipment. For the best price, please contact us.