Curtiss-Wright | FTX Series Rev. C PN71855 5/26/17
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4.4 Rod Ends
FTX series actuators are available as standard with male or female
rod ends with Metric threads. Each standard rod end is also equipped
with wrench flats to aid in attachment to the load.
4.5 Motors
FTX Series actuators are designed to accept many types of standard
electric servo motors or planetary gear reducers that are available
through various manufactures. Due to motor size, torque or speed, not
all motors or reducers can be mounted to each standard actuator.
4.6 Electronics
Electronics and drive amplifiers to match the appropriate motors are
available through the same manufactures that supply the motors. All
maintenance and service guidelines contained within the motor
manufacture manuals should be followed to avoid service problems
associated with the amplifier and motor.
5.0 Specifications
5.1 Life Calculations
The expected life of the roller screw in a FTX actuator is expressed as
the linear travel distance that 90% of the screws are expected to meet or
exceed before experiencing metal fatigue. This is not a guarantee. For
accurate lifetime calculations of a roller screw in a linear application,
cubic mean load should be used. Consult the catalog for ratings and
formulas associated with life calculations.
5.2 Load, Torque, and Linear Speed Calculations
The thrust load applied by the FTX actuator is dependent on the
amount of torque that is applied to the roller screw shaft and the lead of
the roller screw within the actuator. It is important to include any gearbox
reduction and or drive train belt and pulley reduction into this equation as
well. The equation that defines the amount of torque required for a
corresponding thrust force is listed in the Exlar catalog. Reference this
catalog for torque calculations and ratings.
