Motion systems
Motion systems
DIY Motion platform I
DIY Motion platform II
DIY Motion platform III
DIY Motion Platform IV
DIY Motion Platform V
New ideas
Presentation FSCB

Hexapod systems are typically used by the commercial simulators. They make use of 6 linear actuators that have to be driven independently. This system can achieve all 6 degrees of freedom. This system is extremely complex and expensive.

For experiments without spending lots of money, several possibilities are shown below:

2 (3) degrees of freedom: Longitudinal movement  Sideways movement  (Yaw angle movement)
A simple platform placed on ball bearing rollers. The actuators need to flex to accommodate the other axisí movement, something that could be accomplished with cable/pulley drive.


3 degrees of freedom: vertical movements,  pitch angle movements, roll angle movements
This setup has some driving complexity, as the three actuators need to be driven simultaneously for each dedicated movement.
The three actuators need to be able to carry the full weight of the moving structure.

2 degrees of freedom: Pitch angle movement  Roll angle movement 
Tilting platform with center support. This structure can lift a lot of weight, and is often used for 2doF motion platforms.

It has to be noted that the person on the platform sits relatively high with regard to the pivoting point. This high center of gravity makes the platform more difficult to drive. The person on the platform will also experience forward and sideward motion as well as pitch and roll motion.

3 degrees of freedom: vertical movements,  pitch angle movements, roll angle movements
This is a variation on the previous construction, where the center support can move up and down. The spring will take most of the platform weight, and with the three actuators 3DoF can be made with relatively low driving power. 


2 degrees of freedom: Pitch angle movement   Roll angle movement
Similar as the tilting platform, but here the pilot can be seated lower,  closer to the rotation points, thus making driving easier.
Pitch and roll will also have less forward and sideward motions. The interconnecting frames and bearings need to be strong enough to hold the load.

For building the actuators, some possibilities are described in the Actuators chapter


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