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How To Calibrate A Press Brake

How To Calibrate A Press Brake

A press brake is a machine used to bend sheet metal. Regular calibration of your press brake is essential to ensure accurate bends. This article will provide a step-by-step guide to calibrating your press brake, emphasizing technical terminology, detailed explanations, and supporting data.

Materials and equipment
Dial indicator with magnetic base
Test rod of known thickness and length
feeler gauge
combination wrench

Specific steps

1. Machine cleaning:

Clean your press brake thoroughly to ensure accurate calibration. Use a rag or brush to remove dirt, debris, and any contaminants from the surface of the machine.
Oil level check:
Check the oil level in the hydraulic oil tank of the press brake. The oil level should be between the “full” and “add” marks on the dipstick. If the oil level is low, add the appropriate type and amount of oil until the correct level is reached.

2. Machine inspection:

Inspect the press brake for any signs of damage or wear, including cracks, dents, loose bolts, or misalignment. If any problem is found, do not operate the machine until it has been repaired or adjusted by a qualified technician.

3. Machine settings:

Set up the press brake for the calibration process by selecting the appropriate tools and configuring the machine parameters. This includes:
Select the correct punch and die set for the required bend angle and material thickness.
Adjust the ram stroke to meet bending requirements.
Use the machine controller to set the bend angle and back gauge position.
Test bend and calibration adjustments:
Use a piece of scrap material with known properties to perform a test bend. Use a protractor or other angle-measuring device to measure the bend angle.
Compare the measured bend angle to the desired bend angle. If there is a difference, adjust the machine’s calibration settings accordingly. Repeat the test bend and calibration process until the desired bend angle is achieved.

4. Data recording and documentation:

Record calibration settings, including punch and die sets, punch strokes, bend angles, and back gauge positions for future reference.
Document calibration procedures and results in a maintenance log or other appropriate format. This will help ensure traceability and facilitate future calibrations.

Safety instructions:

When using a press brake, always prioritize safety. Please follow these guidelines:
Wear safety glasses and gloves to protect your eyes and hands from injury.
Keep hands away from moving parts of the machine.
Be aware of your machine’s pinch points and take precautions to avoid becoming pinched.
Follow all safety instructions and warnings provided by the machine manufacturer.


By following the steps outlined in this article and adhering to safety guidelines, you can effectively calibrate your press brake to ensure accurate and consistent bending operations. Regular calibration is critical to maintaining machine performance, preventing defects, and maximizing productivity.


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