· KAIPU Engineering · glossary · 1 min read
undefined — Industry Glossary Entry
Definition of runout in industrial blade measurement: the total indicated reading (TIR) of the knife as it rotates on a spindle, and how runout affects cut quality.
undefined is the total indicated reading (TIR) of a circular knife as it rotates on a precision spindle. Runout is the sum of the knife’s out-of-roundness, its concentricity on the spindle, and the spindle’s own error.
Typical runout by application
- Precision slitter (film, foil): ≤ 0.005 mm TIR
- Standard slitter (paper, film): ≤ 0.010 mm TIR
- Tissue slitter: ≤ 0.015 mm TIR
- Granulator rotor: ≤ 0.025 mm TIR (less critical, impact dominates)
- Plate shear: not applicable (single pass)
How to measure
- Mount the knife on a precision spindle
- Set a dial indicator on the OD or on a reference face
- Rotate 360°
- Read the TIR = max - min
See also: Parallelism, Preventive maintenance schedule (article).