glossary
Parallelism — Industry Glossary Entry
Definition of parallelism in industrial blade measurement: the difference between two parallel reference surfaces of a knife, and how parallelism affects cut.
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Parallelism is the difference between two parallel reference surfaces of a knife, measured in millimetres. On a slitter, parallelism is the difference between the two side faces; on a shear, it is the difference between the cutting face and the back face of the upper or lower blade.
Typical parallelism by application
- Precision slitter (film, foil): ≤ 0.005 mm across full face
- Standard slitter (paper): ≤ 0.010 mm
- Tissue slitter: ≤ 0.015 mm
- Plate shear: ≤ 0.010 mm across the cutting edge length
How to measure
- Place the knife on a precision surface plate
- Set a dial indicator on the parallel face
- Traverse across the face
- Read the TIR = max - min
See also.
