How do I install a die correctly?
Clean, seat, clamp, check. Most die problems that look like tooling faults are installation faults: a chip under the die, a clamp not torqued, or a die seated against burrs. The sequence matters more than the speed.
- Clean the ram clamp and the bed die holder; a single chip tilts the die.
- Seat the lower die fully back against the holder and clamp it.
- Install the punch, check the tang is fully home in the clamp.
- Close the ram slowly and check the punch enters the die centrally along the whole length.
- Run a test bend and check the angle at both ends and the middle.
How do I check alignment without indicators?
A straightedge and a test bend tell you most of what you need. Close the ram on light paper or shim stock at several points along the die: even pinch marks mean even alignment. Then bend one piece and measure the angle at both ends and the middle.
| Symptom | Usual cause | First check |
|---|---|---|
| Angle differs end to end | Ram tilt or worn bed | Paper pinch test along the die |
| Angle differs in the middle | Deflection under load | Crowning compensation |
| Sheet marked on one side | Die not parallel to punch | Clean and re-seat the die |
| Tooling moves under load | Clamp not torqued or worn | Clamp bolts and wear plates |
What adjustments are available once the tooling is in?
Shimming corrects small alignment errors, crowning compensates deflection, and the back gauge sets the flange length. Adjust one thing at a time and re-measure, because the three interact.
- Shims: correct tilt and small height differences between tooling sections.
- Crowning: compensates the beam deflection that opens the middle of the bend.
- Back gauge: sets the flange; re-check after any tooling change because the height changes the touch point.
- Ram depth: the angle control in air bending; record it per material and thickness.
What should I check during a tool change?
The clamping surfaces, the tang seating and the die holder take the punishment. Worn clamps let the punch sit high, which changes the angle without any obvious cause, and a scored holder slowly destroys alignment.
Related technical pages
Press brake setup guide
The full set-up sequence from material to first bend.
Common setup mistakes
The errors that cost angle, tooling or safety.
Tooling alignment quick check
A daily check that catches drift before it shows in the part.
Crowning systems
How crowning compensates deflection on long bends.
Next step
Send the machine model and tooling system and we will confirm the correct clamp and holder set.
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