CNC Press Brake Back Gauge Calibration

The ultimate goal of CNC press brake back gauge calibration is indeed to make it parallel to the bending line. A parallel back gauge ensures that the distance between the back gauge and the bending line remains consistent throughout the entire length of the bending machine, thereby ensuring the accuracy and quality of the workpiece to reduce the time cost and material waste caused by rework.

press brake back gauge

When is CNC press brake back gauge calibration needed?

CNC press brake back gauge calibration is typically needed under the following conditions:

1. If you notice variations in bend angles or dimensions across different parts or along the length of a single part, and there is a rise in rejected parts or a decrease in overall productivity, it may indicate the back gauge needs calibration.

2. When the actual distance between the back gauge and the die doesn’t match the programmed values in the CNC control system, calibration is necessary.

3. The back gauge calibration of the press brake should be performed when the press brake is just installed or moved to a new location, or when any part of the back gauge system has been repaired or replaced, or when it is subjected to any accidental impact or collision.

4. Over time, mechanical components can wear, affecting the accuracy of the back gauge. If you notice increased wear, calibration may be needed. 

Regular calibration is recommended as part of routine maintenance, typically at least twice a year, to maintain optimal performance.

By regularly checking for these conditions and performing calibration when needed, you can ensure your CNC press brake maintains optimal accuracy and productivity.

brake press back gauge

How to perform CNC press brake back gauge calibration?

1. Ensure the press brake is turned off and locked out to prevent accidental operation. Wear appropriate personal protective equipment (PPE).

 Remove any dirt, dust, or debris from the CNC press brake, especially the back gauge, as these can affect calibration accuracy.

2. Use a tape measure, dial gauge, or caliper to measure from specific reference points (such as the bed or another fixed point) to the back gauge fingers. Record these measurements.

Use a square to verify that the back gauge fingers are perpendicular to the bed of the press brake if necessary.

3. Loosen the locking mechanism for the back gauge adjustment. This typically involves using Allen keys or similar tools.

4. Adjust the grub screws at the front and rear to move the back gauge bar forward or backward. Then check measurements and repeat until the bar is parallel.

5. Move the back gauge to several positions along the bed and verify the distances using the tape measure or caliper.

Check that the actual distances match the programmed positions on the CNC control panel.

You can also use a piece of scrap material to perform the bending process and measure the resulting bending angle and bending size. Compare the values ​​with the data input into the CNC system. If there is an error, further adjustments need to be made.

Why CNC press brake back gauge calibration important?

The most convincing reason why CNC press brake back gauge calibration is important is that it directly impacts the accuracy and consistency of the bending process, which is crucial for producing high-quality parts and reducing waste. 

An improperly calibrated back gauge can lead to significant errors in the final product, resulting in parts that are out of tolerance or have inconsistent angles[1]. This can have severe consequences, including:

1. Scrapped parts and wasted materials

2. Costly and time-consuming rework

3. Reduced productivity and efficiency

4. Potential damage to the machine and its components

In industries where precision is paramount, such as aerospace and automotive manufacturing, even small deviations can lead to significant problems. A well-calibrated back gauge ensures that the press brake consistently produces parts that meet the required specifications, maintaining the integrity and safety of the final products.

About Us – MYT CNC press brake manufacturer

As a CNC press brake manufacturer, we have more than 20 years of experience in CNC press brake production. If you have any information related to CNC press brake that you would like to know or need any technical assistance, such as the press brake calibration introduced in this article, please contact us for support.

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