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Introduction Belt Drive Design Calculator is a free online mechanical engineering calculator for analyzing an open (uncrossed) flat-belt or V-belt drive between two pulleys. It can calculate the driver pulley diameter (D₁), driven pulley diameter (D₂), driver speed (N₁), or driven speed (N₂) using the belt-drive speed relationship. The calculator also provides the velocity ratio,…

Gear Design Solver is a free online engineering calculator for the basic geometry of standard 20° full-depth spur gears. It uses the fundamental gear relationship D = m × N to calculate the Module (m), Number of Teeth (N), or Pitch Diameter (D) when the other two values are known. The calculator also provides important…