Jaw Crusher Reduction Ratio & P80 Calculator
Calculate primary jaw crusher reduction ratio, product 80% passing size (P80), allowable nip angle, and Gaudin-Schuhmann distribution modulus.
Crusher Settings & Feed
Run-of-mine blasted rock
Safe limit: 16° to 22°
Crushing Reduction & Sizing
Reduction Ratio R (F80 / P80):
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Product P80 Size (mm):
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Nip Angle Condition:
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Top Size Limit P100 (mm):
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Frequently Asked Questions
What is an acceptable reduction ratio for a jaw crusher?
Standard single-toggle primary jaw crushers operate with reduction ratios between 4:1 and 7:1. Higher ratios increase wear on jaw plates and increase the risk of stalls.
What is the nip angle and why is it critical?
The nip angle is the acute angle between the fixed and swinging jaw dies. If the angle exceeds 22°–24°, the frictional force of steel against rock cannot overcome upward expulsion forces, causing rocks to pop out ("squirt") dangerously.
Why is corrugated jaw liner geometry used?
Corrugated teeth concentrate compressive force into point and line contacts, inducing tensile stress failure in brittle ore rocks with 30% lower crushing energy than flat plates.