|
Axial Load - A load whose center of
gravity runs though the axis of the actuator screw
Ball Brake - Used on smaller AC motor
units, the ball brake is a bi-directional brake that limits drift
when the unit is under a full load
Cantilever Mount -A pin mount where the
pin is not Supported on both sides. Deflection of the pin
can cause binding. This type of mount is unacceptable
Clevis
Mount -A flat sided fitting, or part,
that is drilled to allow for mounting with a pin or bolt
Compression Load - A load that presses on an actuator along the
axis of its screw
Current Draw - Amount of
current (amperes) required by a motor to
move a load. It increases as the load increases
Cycle - A complete sequence of full
extension and retraction by the actuator
Double Lead Screw - A double lead screw
has two separate threads that wrap around the outside
diameter of the screw. The advantage of this type of screw is the
lifting nut will travel twice the distance with each single turn
of the screw
Duty Cycle - Percentage of
time an actuator is in motion relative to total time. Example: If
the total running time for an actuator is 20 seconds in
every minute, the duty cycle is 33%
Eccentric Load - A load
whose center of gravity does not go through the screw axis.
Off-center loads cause binding and shorten the actuators life
Evoloid Gear - Evoloid
gears are used to connect parallel shafts. The primary advantage
over spur gearing is it allows the use of 1,2,3 or4 tooth pinions.
This has the ability to provide a large reduction
ina very small package.
Extension/Retraction Rate - The speed at
whichan actuator extends and retracts. In DC
modelsthe speed can depend on the load
Jog - To move the actuator in short
increments
Limit Switch - A device used to limit
theextension or retraction of an actuator to
a pre-setposition
|
Load - Material to be moved by the
actuator
Overload Clutch - A
built-in device that slips when the actuator
reaches a predetermined load limit
preventing damage to the unit
Peak Load -The maximum momentary load
that an actuator can control
Pivot Mount - A clevis mount that allows
the actuator to pivot while in operation
Potentiometer - A device that provides
position feedback information from an
actuator
Screw Pitch - The screw pitch is the
distance from a point on a screw thread to
the equivalent point on an adjacent thread
Side Load - A load exerted on the side
of the actuator housing or translating tube.
Side loading can shorten the life of an
actuator. Also called radial load
Spring Brake - A bi-directional no-back
type brake that is automatically activated
by pinion torsion and released when the
motor turns
Spur Gear - A gear wheel with radial
teeth parallel to its axis
Static Load - The maximum load an
actuator can hold when not operating
Stroke Length - The total travel of the
translating tube from retracted to fully
extended
Superoid Gear - Gears that are used to
connect non-intersecting and non-parallel
shafts. The worm gear is conical in shape
and the gear is a face type (has gears on
the face rather than the outside diameter).
This type gearing allows for very high gear
ratios in a compact design
Tension Load - A load that pulls on the
actuator along the axis of its screw.
Amount of torque exerted on
Torque Restriction the mounting brackets
during operation
Translating Tube - The tube that extends
in and out of the actuator
Wiper Seal - A seal between the actuator
housing and the translating tube to keep
contaminants out of the actuator. Also
called a scraper seal
|