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CNC press brake programming · Lesson 4 of 4

CNC press brake programming: defects, verification and case study

Symptoms traced to program causes and their sourced fixes, four decisions done wrong and right, case studies on drifting angles, a wrong part from an angle mix-up and a fatal ejection, and the first-part sign-off record.

You will be able to: Diagnose a program-caused defect from its symptom, choose a sourced correction, and document the evidence for review, including the first-part check and the record a folder send leaves.

11 min · 12 slides · 7 questions

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Slide 1 of 12

Angle defects and their causes

Angle off on every part after a die change: the program was reopened with different tools from the ones it was saved with. Cincinnati: use the same tools.

Angles wander within a batch: thickness and hardness vary. Do not chase single parts.

Cincinnati: do not make angle corrections in the middle of a production run unless two or more consecutive bends are out of tolerance.

Sources

Videos for this lesson

What this video shows: Per its description, a Cincinnati webinar on how press brakes deflect, when to compensate, the types of crowning systems and how to use them. About an hour long.

Video: Understanding Press Brake Deflection Compensation by Cincinnati Incorporated, on YouTube. AFS checked its description against this lesson.

Glossary

Crowning
Deflection compensation on a press brake. Cincinnati machines a crown into its XF press brake bed so bed and ram are parallel at 1/2 to 2/3 of full tonnage with the load spread evenly; under normal loads this reduces the shimming needed to cut angle variation along the bend.
First part
The first piece made from a program, measured against the drawing before the run continues; Cincinnati says actual dimensions are found only by making and measuring the bend.
Profile number
The number PathfinderEdge returns for a profile it created. AFS counts a send to its folder as successful only when that number has come back.
Lockout/tagout
Under 29 CFR 1910.147, isolating and locking out a machine's energy before servicing; minor routine tool changes in production are excepted only with alternative effective protection.