Stripper Pressure Calculator

Calculate the force required to strip the material off the punches so you can size stripper springs correctly.

After the cut, the stock clings to the punches and must be stripped off. Stripping force is a fraction of the cutting force — light for thin soft stock, higher for thick or sticky material.

A common planning rule is 10–20% of the cutting force. The spring system must deliver this force at the top of the stroke. (The Punch Force calculator reports the same 10–20% band; size springs toward the upper end.)

Formula: Stripping force ≈ 10% to 20% of Cutting force

Worked Example

  1. If the cutting force is 18,000 lb, stripping force ≈ 1,800–3,600 lb.
  2. Size the stripper springs for the upper end so they strip reliably at full punch withdrawal.

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