# Belt tension from transmitted torque
# Scope: Tight/slack tension from torque and supplied pretension; no belt rating.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

torque = 2 N*m
radius = 25 mm
pretension = 100 N

difference := torque/radius [N]
tight := pretension+difference/2 [N]
slack := pretension-difference/2 [N]

check slack stays taut: slack > 0 N

scenario alternative: torque = 1.6 N*m