Weaving & Fabric Construction

Pick Spacing & Beat-up Force Estimator

When weft diameter approaches pick spacing, beat-up force climbs sharply and so do warp breaks.

Construction Weft geometry
PPI
Ne
Warp Sheet Loom tension
no.
cN

Estimated Beat-up Force

— N

Reed force against both warp sheets

Fell Geometry

Pick Spacing
— mm
Weft Yarn Diameter
— mm
Diameter to Spacing Ratio
— %
Total Warp Tension
— N

A first-order geometric estimate, not a dynamic simulation. It ignores reed inertia and fell displacement, so use it to compare constructions rather than to size a sley drive.

Pick Spacing & Beat-up Force Estimator — free, with the formula and a worked example, at Textile School.