A repair decision should not be based on the visible break alone. Local rule or rubber replacement can be economical when geometry is still correct; if the board-to-product relationship has changed, repair may only postpone production risk. A cutting die repair and refurbishment assessment starts with that distinction.

Confirm whether the product has changed

Even a repeat job under the same SKU can carry a revised closure, glue flap or material thickness. Repairing before comparing the current drawing with the old die preserves geometry that may no longer be valid. Verify critical dimensions, crease positions and machine layout first.

The comparison starts by laying a 1:1 print of the current drawing over the old die; if the cut and crease lines do not coincide, repair is not discussed. Even when the product looks unchanged, the lock tab, lid allowance or board thickness may have changed quietly; the print shows the difference within minutes.

  • The current drawing is printed 1:1 and laid over the old die.
  • Lock, lid allowance and material thickness are asked about separately.
  • If the lines do not coincide, repair is off the table and a new die is discussed.

Separate local wear from systemic damage

A blunt joint or missing rubber segment is local. A warped board, widespread loss of rule height or generally crushed creases affect the complete tool. Check the die on a flat reference and inspect every important rule joint.

Board flatness is checked on a flat bench: if one corner lifts, the board has warped and rule height has been lost on one side of the line. A dull joint or a torn piece of rubber at a single corner is local work; the two cases do not cost the same money or the same time.

  • The board is checked on a flat bench; a lifting corner means warp.
  • Rule joints are inspected one by one by eye.
  • Local dulling and torn rubber are regional; a warped board and general dulling are systemic.

Include press downtime in the cost decision

A cheap repair becomes expensive if it causes repeated make-ready, waste and a second stop. Repair often suits a short run with localized wear; a new die can be safer for high volume, narrow tolerances or a critical delivery window.

The cost comparison is made in two columns: repair cost + probable second stoppage + waste, against new die cost + lead time. On a short run with a local fault the first column stays small; on high volume, tight tolerance or a critical deadline the second column is usually cheaper.

  • Probable downtime and waste are added to the repair cost before comparing.
  • Repair leads on short runs with local faults, a new die on high volume.
  • When the deadline is critical, the new die’s lead time is counted too.

Record the decision with four pieces of evidence

Keep the current drawing, full die photograph, close view of the problem and latest cut part in the same job record. The decision then rests on comparable production evidence rather than memory alone.

When the four pieces of evidence arrive in one message the decision can be taken remotely: current drawing, top-down photo of the die, close-up of the problem area and the last cut part. The decision and its reason are written on the die card; when the same die comes in next time the discussion does not start from zero.

  • The four pieces of evidence are sent in one message with the die number.
  • The decision and its reason are entered on the die card with the date.
  • The next assessment starts from that record.

Application note

Send the die photographs and latest cut part so the repair limit can be assessed.

  • Use the current material and dimensions.
  • Compare a clean sample with the defective sample.
  • Record the decision with photographs and drawings.