On a gasket or industrial part die it is function that gets approved, not looks: does the part seat on the flange, do the holes land on the bolts, is the thickness direction right? The sample check answers those three questions at the point of assembly, not on the bench. Dimensions, hole centres, material compression and repeat-order safety are read together in the same check.

The sample tests the drawing

On industrial parts the drawing is often taken from an old part, and that part may be worn, stretched or crushed in service. The sample measurement is therefore as valuable as the drawing itself: the first cut part is measured with callipers on a flat surface, unconstrained, and compared with the drawing point by point.

The wear allowance on the old part is noted separately. Copying the outer dimension of a worn gasket exactly carries the wear into the new part; the reference is the flange or groove the part will seat in, not the final state of the old part.

  • The first part is measured flat and unconstrained.
  • Hole centres are checked from a single reference point.
  • Wear on the old part is noted, not carried into the drawing.

Material compression changes the dimension

Rubber, foam, felt and similar flexible materials compress under the rule first, cut second and spring back afterwards. The cut hole can therefore differ from the rule diameter, and the difference depends on the hardness, thickness and rule edge. The same drawing gives one dimension on a thin, hard sheet and another on thick, soft foam.

The die decision follows that behaviour: when material type, thickness and hardness are written in the order, the rule diameter and edge form are chosen with compensation. On the sample, the spring-back is allowed a few minutes and the part is measured again; a reading taken immediately can mislead.

  • Material type, thickness and hardness are given together in the order.
  • The measurement is repeated a few minutes after the cut.
  • The sample is cut from the production material; a “similar” one misleads.

Critical holes need their own marking

Not every dimension carries the same weight. Screw, locating and sealing points decide the assembly; the outer contour can be left freer on most gaskets. When the critical holes are marked on the drawing with a tolerance value, the workshop focuses its measuring round there and the sample check gets shorter.

The assembly direction and, where there is one, a photo of the mating part also decide how the sample is tried: where possible the part is fitted on the real flange with the bolts in. A calliper reading can look right while the hole pattern binds in assembly; the flange trial shows that difference.

  • Critical holes are marked on the drawing with a tolerance value.
  • Assembly direction and a photo of the mating part are added to the file.
  • Where possible the sample is fitted on the real flange with bolts.

On repeat orders the old die is checked

On a repeat order for an industrial part the old die is not put straight on the press; the rule edge, rubbering and board flatness are looked over first. Flexible material tires the rule differently from board: a dulled edge opens the hole by crushing instead of cutting, and the dimension drift starts there.

If the material has changed the old setting is not treated as safe: a sheet of different hardness gives a different dimension from the same die. A material change is therefore written plainly on the repeat order, and the first part is tried in assembly again; the record becomes the reference for the next order.

  • A photo of the old die and the last cut part are shared together.
  • A change of material or supplier is stated on the order.
  • The first part of the repeat run is tried in assembly again.

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

Related production scope: gasket cutting dies.