ISO 8116-5:2008

Overview

ISO 8116-5:2008 - part of the ISO 8116 series on beams for winding - defines the essential dimensional, mechanical and tolerance requirements for sectional beams used on warp knitting machines. The standard specifies main dimensions, mechanical strength classification, permissible form and position tolerances, run‑out limits and designation rules to ensure interchangeability, safe operation and consistent winding quality for warp knitting applications.

Key topics and technical requirements

• Main dimensions: Specifies flange diameters, barrel and overall lengths and related keyway dimensions for sectional beams (main dimensions given in the standard).
• Mechanical strength: Classification of strength by quality classes (Q1–Q4) and verification by test methods referenced to ISO 8116-4.
• Flange circular axial run‑out (Ta): Permissible values are provided by flange diameter (examples in the standard include 335, 532, 762 and 1 000 mm with corresponding Ta limits).
• Barrel total run‑out (Tr): Calculated from overall length l using the formula Tr = 0.25 × l / 1000 (measured per ISO 8116-8).
• Residual imbalance: Guidance recommends a balance quality grade G 6.3 per ISO 1940-1 unless other grades are specified.
• Taper reception: For flange diameters ≥ 762 mm, a taper reception option is defined to improve centring on a mandrel.
• Specification details to provide: Material of barrel and flanges, material to be wound, flange fabrication (casting/forging), surface quality/treatment, number of boss grooves, and taper reception if applicable.
• Designation format: e.g., “Sectional beam ISO 8116-5 - 535 × 1 065‑Q4” (flange diameter × overall length × quality class).

Applications and users

• Practical use: Ensures sectional beam parts meet dimensional and balance tolerances for reliable winding and consistent warp yarn supply on warp knitting machines.
• Who uses it:
  • Textile machinery manufacturers and OEMs (design and production of sectional beams)
  • Machine builders and integrators (specifying compatible beams)
  • Textile mills and warp knitting operations (procurement and acceptance testing)
  • Quality and maintenance engineers (inspection, balancing and replacement)
  • Suppliers of flanges, barrels and mandrels (manufacturing to agreed tolerances)

Related standards

• ISO 8116 series (Parts 1–9) for beams and related terminology, tests and tolerances
• ISO 8116-4 (test methods and quality classification of flanges)
• ISO 8116-8 (definitions of run‑out tolerances and measurement methods)
• ISO 1940-1 (balance quality requirements for rotors)
• ISO 286-2 (system of limits and fits - tolerance grades)

ISO 8116-5:2008 is essential when specifying or validating sectional beams for warp knitting machines to ensure dimensional compatibility, mechanical integrity and winding performance.