A tolerance is more than a number on the drawing. Material stretch, cutting pressure, the position of the crease and the press setting decide how the drawn dimension turns out on the product. Dimensional safety in cutting die manufacturing is therefore built in four steps: drawing scale, material behaviour, the crease-to-cut relationship and the first-piece check.

Drawing scale is the first check

A PDF can look right on screen while the scale was distorted on export, the unit stayed in inches or the page shrank under a “fit to page” setting. The file therefore carries at least one control dimension: the outer width, outer length or a critical window dimension is written as text, and the workshop verifies the file against it first.

Where possible a vector source such as AI or DXF is sent together with the PDF; the cut line is delivered as a closed contour, with open ends and double lines removed. When the file name carries a revision code and date there is no argument about which version was measured.

  • At least one control dimension is written as text in the file.
  • The cut line is delivered as one closed contour.
  • Revision code and date are part of the file name.

Material can change the dimension

Board grain, corrugated flute, a label liner or the hardness of PVC changes the cut result. Flexible material compresses under the rule and springs back, so the cut dimension can drift from the rule dimension; hard plastic gathers stress at the corner. The tolerance decision is therefore never made independently of the material.

When grammage and thickness are written on the order the rule diameter and edge form are chosen with compensation. On material that may stretch or shrink (rubber, foam, thin film) the sample-cut option is discussed at the start; when the critical dimension is marked with a tolerance value the check focuses only there.

  • Grammage, thickness and hardness where relevant are written on the order.
  • Material likely to stretch or shrink is flagged from the start.
  • Critical dimensions carry a tolerance value; not every dimension does.

Crease and cut affect each other

When the fold line sits too close to the cut line the narrow strip of board between them tears on folding or the product shape distorts. The crease allowance changes with board thickness: on thick board the allowance grows, and if it is too small the panels overlap and the box’s outer dimension drifts from the drawing.

On carton work the dimension check is therefore made on the folded product, not only on the flat sheet. The crease-to-cut distance is checked on the drawing, the fold direction is stated, the channel requirement is assessed with the material; lid fit and lock tightness are the final proof of the dimension.

  • The distance between crease and cut line is checked on the drawing.
  • Fold direction and print face are stated.
  • Box dimensions are verified on the folded product, lid and lock included.

The sample check protects the production run

On jobs where dimensions are critical, production does not start before the first cut part is checked. The first part is measured flat and unconstrained and compared with the drawing point by point; on flexible material the measurement is repeated after a few minutes, and a part that goes into an assembly is tried in place where possible.

Any deviation is tracked through a drawing revision and the new version goes into the file name. On repeat jobs the old die is checked again for rule line and board flatness before it goes on the press; the approved first part and its record become the reference for the next order.

  • The first part is measured flat and the result compared with the drawing.
  • Deviations are tracked through a dated file revision.
  • On repeat jobs the old die is rechecked before production.

Quote details we clarify together

When the file, material, quantity and deadline are clear, the quote conversation moves faster and with less back-and-forth.

  • Current revision file
  • Material and quantity details
  • Critical dimensions or production notes
  • Deadline expectation and delivery preference