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LEXICON
Positions,
forces and travels
Actuator positions
Dimensions for actuator positions are always speci?ed in relation to a given
reference line.
Rest position
The rest position is the position of the actuator when no external force is
being applied. Sometimes referred to as the “free position”.
Operating point (mech.)
The point along the actuator ’s travel path at which the spring-operated
mechanism is actuated.
Final position (total travelled position)
The position of the actuator at the end of its travel.
Reset point (mech.)
The point along the actuator ’s path, as it travels back to its rest position,
at which the spring-operated mechanism snaps back to its original posi-
tion.
Actuator travel
Pretravel
The distance travelled between the actuator ’s rest position and the switching
point.
Overtravel
The distance travelled between the switching point and the end position.
To make absolutely sure that the switching operation takes place, an actu-
ator should use up at least 50 % of the available overtravel.
Reset travel
The distance travelled between the end position and the release point.
Free travel (open circuit travel)
The distance travelled between the reset point and the rest position.
Total travel
The sum of pretravel and overtravel, or of reset travel and free travel.
Movement differential
The distance travelled between the operating point and the reset point.
Actuator
Housing
Rest position
Operating position
Final position
Reset position
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