Belt Length Calculator โ V-Belt and Flat Belt Drives
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Formula
Open Belt: L = 2C + ฯ(D+d)/2 + (Dโd)ยฒ/4C Cross Belt: L = 2C + ฯ(D+d)/2 + (D+d)ยฒ/4C
D=200mm, d=400mm, C=600mm, Open: L = 1200 + 942 + 4 = 2,146 mm
Frequently Asked Questions
Open belt: both pulleys rotate same direction. Cross belt: opposite directions, higher wrap angle but belt wears faster at the crossing point.
V-belt sections (A, B, C or SPZ/SPA/SPB/SPC) are chosen based on power and smaller pulley diameter. Add 40โ60mm to calculated length to select nearest standard size.