Telescopic Linear Actuator: Compact, Powerful & Precise Control

Duty cycle is the fraction of the working period in which a linear actuator can remain active. You can calculate the duty cycle of a linear actuator by using the following equation: Duty cycle (%) = (Time the linear actuator is active) / (Time for one working period)

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For example: With a 25% duty cycle, an actuator can run for 5 minutes continuously before needing to rest for 15 minutes before operating.

What Is Backdriving?

Backdriving is when an actuator starts sliding down under load, when it is either overloaded or when the actuator has been damaged. Watch the video.

What Does Dynamic and Static Load Ratings Mean?

Dynamic load rating is the amount of weight an actuator can pull or push safely when being powered. Static load rating is the amount of weight the actuator can hold or withstand without back driving when it is not being powered. For example, let's just say you have an actuator installed on a window and the static load rating of the actuator is 100lbs, it could experience backdriving when there is a high wind event, which means there will be more pressure exerted on the actuator which would exceed the 100lbs load rating of the actuator.

What Is Lateral Loading?

Lateral loading is when the actuator experiences forces from the lateral plane. Actuators are not meant to handle lateral forces at all so if it experiences any lateral forces, it will likely damage the actuator or bend the rod. So it's advised never to use lateral forces and always make sure the actuator is fully in line or in sync with your application, so it does not take any load other than the axial load. Watch the video.

Overview of Linear and Telescope Actuators from A.MANNESMANN

The linear actuator is a functional module for converting the drive rotation into a translational movement. It includes the expansion of a ball screw by its bearings, with a solid longitudinal guide and a dynamic drive system. The linear actuator can be usefully supplemented by integrated force transducers, path measurement systems and monitoring elements.

High Flexibility in Application

The linear actuator in the precision design from A.MANNESMANN is a highly-accurate functional control unit that can be used to realize challenging drive and positioning tasks with the utmost infeed accuracy in a jerk-free operation. These tasks include displacement movements of components with complex, path-dependent processes as well as pressing and joining tasks with direct force-path evaluation.

Application Areas

1-stage linear actuators are increasingly replacing traditionally used hydraulic drives, in plastic machines for example. Depending on the task and its framework conditions, a wide variety of designs are required that can be used to achieve a higher level of precision, a shorter cycle time and lower energy consumption.

2-stage telescope actuators are used in a variety of ways in mechanical and plant engineering where more space is required, such as in aerospace, special machine construction or process engineering.

The patented 4-stage telescope actuators are used in confined spaces due to their highly compact design. The high-precision positioning with telescope actuators occurs in machines with innovative technologies, such as additive manufacturing.

Advantages at a Glance

Economical advantages

• High long-term durability / service life
• Economical standard designs or custom production
• Excellent energy efficiency
• Maximum long-term precision
• Maximum possible machine availability
• Perfected wear resistance due to nitrided spindle

• Perfect positioning capability and repeatability
• High load capacity
• Exact travel movements
• High rigidity
• Ball screw spindles with ground precision (accuracy IT 1, IT 3, IT 5)
• Constant torque
• Extremely low power losses
• Uniformly low operating temperatures
• Can be used in all installation positions
• The highest power transmission rates
• Extremely high degree of efficiency (up to 98%)

Setup of Linear Actuators

The telescope actuator is a ready-to-install machine assembly that is used to convert the driven rotational movement of a motor into a translatory linear movement. The telescopic multi-stage ability of the ball screw spindles makes it possible for the actuator to achieve a very large extension with the shortest-possible retracted block length. Complex machine movements can be numerically controlled and safely monitored with this very compact unit.

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Horizontal or Vertical Installation Position with One-Way and Two-Way Load Bearing Capacity

Due to the little space it requires, the custom design telescope actuator from A.MANNESMANN is particularly well-suited for installation in very confined installation spaces. It is designed for high-precision, jerk-free positioning and movement operation in horizontal or vertical installation positions. The load bearing capacity can occur here one-way or two-way. The preloaded ball screw nuts guarantee freedom from backlash, even with very high tensile and compressive loads.

Individual or Dual System

The AM telescope actuator can be designed as an individual or dual system. With a dual system, both parallel-arranged actuator systems are driven by a joint motor so that they extend and retract synchronously.

Actuators with High Dynamics and Precision

The technical basis of the telescope actuators is the ball screw from A.MANNESMANN, which has been tried and proven in machine tool building. That is why the high performance capacity and the long system durability are a matter of course with these actuators. The high load bearing capacity, the high positioning accuracy, the high dynamics (also at a low travel speed) and the long usage duration are important arguments for using A.MANNESMANN telescope actuators in addition to the compact design.

Our telescope actuator largely determines the performance and accuracy of modern machines. However, this high technical standard can only be met if it is used properly and correctly. It is only intended for industrial use in a complete machine. Other uses require express approval from A.MANNESMANN MASCHINENFABRIK GmbH.

Precision Ball Screws for Maximum Performance

Precision ball screws require the perfect interplay between nuts, balls and ballscrew shaft. The individual parts ground in very tight tolerances are brought to the highest level of precision through the manual assembly by highly skilled specialists.

Only the highest quality materials are used to produce the components. The wear-resistant, long-term nitrided surfaces of all of the ballscrews as well as the through-hardened nuts and balls, optimal ball recirculation systems and effective wipers guarantee the high load capacity and precision over a very long useful life.

The high geometrical accuracies and the preload of the double nuts in 2-point contact during assembly are the basis for the high nut rigidity with simultaneously very low inner friction. This is also reflected in the very high system efficiency and in the low idling and breakaway torques.

The even torque curve, the high level of smooth running and the lowest possible vibration tendency over the entire thread length minimize the power loss and therefore also the heat development, regardless of whether the ball screw is lubricated with oil or with grease.

The installation and load direction of precision ball screws is generally arbitrary and does not affect its functionality.

The designs and the connection dimensions of the precision ball screws are conform with DIN ISO or DIN or correspond to individual customer requirements as special designs.

If you want to learn more, please visit our website Telescopic Actuators(vi,ar,de).

What distinguishes precision ball screws from A.MANNESMANN

• Perfect interplay of nuts, balls and ballscrews
• Precision-ground nuts and shafts in the tolerance classes IT 1, IT 3, IT 5
• High-precision graded balls
• Optimal ball recirculation systems
• Effective wiper systems
• High quality materials for nuts, balls and ballscrew shafts
• Wear-resistant surfaces of the entire shaft (ball raceways and spindle pivots)
• Long-term nitrided
• Tough elastic spindle core
• Through-hardened nuts (100Cr6)
• Very high surface hardness (67 HRC)
• High geometrical accuracy of the nut
• High load capacity
• Long durability
• Double nut with preload (2-point contact)
• Adjustable preload
• Keys to secure the preload
• High nut rigidity
• Low friction
• Low power loss
• Low heat development
• Low idle torque
• Low frictional torque
• Low breakaway torque
• Constant torque curve
• High level of smooth running
• Low vibration generation
• Suitable for oil and grease lubrication
• Manual ball screw assembly
• High quality assurance
• Based on DIN ISO or DIN