4 Bar Link Calculator !!link!! -

The link that usually makes a full 360-degree circle.

[ K_1 \cos\theta_4 + K_2 \cos\theta_2 + K_3 = \cos(\theta_2 - \theta_4) ]

Let’s run a hypothetical design through a . 4 bar link calculator

A windshield wiper (output) must oscillate 60°, driven by a motor (input) that rotates continuously.

Solving for (\theta_3) and (\theta_4) (the coupler and follower angles) requires solving a , often handled via the Freudenstein equation: The link that usually makes a full 360-degree circle

Designing by intuition is dangerous. Without a calculator, you might design a linkage that (cannot move) or fails to meet your motion requirements. A 4 bar link calculator solves three specific problems:

Modern calculators also handle —finding link lengths to achieve a desired coupler curve or timing ratio—using numerical optimization. Solving for (\theta_3) and (\theta_4) (the coupler and

Before diving into the calculations, it is essential to understand the mechanism itself. A four-bar linkage is the simplest movable closed-chain linkage. It consists of four rigid bodies (the bars) connected by four joints (usually revolute or pin joints) forming a closed loop.