# Help Zone

### Student Question

Secondary III • 2yr.

What is the difference between the motion transfer and transformation mechanisms? I do not understand.

Science

## Explanations (1)

• Explanation from Alloprof

Explanation from Alloprof

This Explanation was submitted by a member of the Alloprof team.

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Team Alloprof • 2yr.

Several different technical objects are made up of parts that play a role in their function or construction, called "organs". Sometimes the movement of one organ causes the movement of another.

More precisely, the movement of a driving member can cause the movement of a driven member.

There are three types of mechanical movements:

• Linear translational motion: moving in a straight line

• Rotational motion: turning around a straight axis

• Helical motion: turning and moving along a straight axis

When the driving member causes the movement of a driven member of the same type (for example, a linear translational movement that causes another linear translational movement), the system of parts is a motion transfer mechanism. The driving member and the driven member (and the intermediate members, if any) can be referred to as part of a motion transmission mechanism.

When the driving member causes the movement of a driven member that isn’t of the same type (for example, a linear translational movement that causes a rotational movement), this is a transformation of the movement. The driving organ and the driven organ (and the intermediate organs, if any) can be referred to as part of a motion transformation mechanism.

Here are some examples of motion transmission mechanisms:

• Toothed wheels (rotation to rotation)

• Pulley and belts (rotation to rotation)

Here are some examples of motion transformation mechanisms:

• Cam and roller (rotation to rectilinear translation)

• Screw and nut (rotation to translation)