Roller screws
Acme screws
Ball screws
Hydraulic cylinders
Pneumatic cylinders
Load ratings
High
Moderate
Moderate
High
Moderate
Lifetime
Long, many times greater than that of ball screws
Short, due to high friction and wear
Moderate
Can be long with proper maintenance
Can be long with proper maintenance
Speed
Fast
Slow
Moderate
Moderate
Fast
Acceleration
High
Low
Moderate
High
High
Electronic positioning
Easy
Moderate
Easy
Difficult
Very difficult
Stiffness
High
High
Moderate
High
Low
Shock loads
High
High
Moderate
High
High
Relative space requirements
Minimum
Moderate
Moderate
High
High
Friction
Low
High
Low
High
Moderate
Efficiency
>90%
≈40%
>90%
<50%
<50%
Installation
Compatible with standard servoelectronic controls
User may have to engineer a motion/actuator interface
Compatible with standard servoelectronic controls
Complex, requires servovalves, high-pressure plumbing, filters, pumps, linear positioning, and sensing
Very complex, requires servovalves, plumbing, filters, compressors, linear positioning, and sensing
Maintenance
Low
High, due to poor wear characteristics
Moderate
High
High
Environmental impact
Minimal
Minimal
Minimal
Hydraulic-fluid leaks and disposal
High noise level

MAKE CONTACT
Exlar Corp.,
(952) 368-3434, exlar.com

 

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