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Q&A   Linear Actuators

The following is a list of answers for frequently asked questions from our customers. Select questions to view the answers.

Linipower Jack

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Q1Is the Linipower Jack environmentally friendly?  
Q2 Are the products compliant with the RoHS directive?
Q3 What is a rotation prevention mechanism?
Q4 What is the Travel Nut Package?
Q5What is the operating temperature for the Linipower Jack?
Q6Can you make the Linipower Jack for outdoor use?  
Q7 Can I use mechanical stops?
Q8 Can we use a travel nut type with its end being free?
Q9When we use two Linipower Jacks in conjunction, do they need a rotation prevention mechanism?  
Q10Can the Linipower Jack handle being used laterally?
Q11What are the points to be careful about when installing Linipower Jacks for interlocking operation?
Q12Is the Linipower Jack capable of oscillation?
Q13 Under what circumstances is clevis mounting on both ends used?
Q14 Is it possible to use the JWB model (ball screw type) with a percentage duty cycle of 30% ED or higher?
Q15 Does Tsubaki E&M provide one-side cutting or shaft end tapping on the input shaft, and plating, etc.?
Q16 What is the backlash like for the input shaft?
Q17 Do you ship the jack in the state in which a motor or geared motor has been attached to its input shaft?
Q18 Is it possible to turn the jack input shaft with a manual handle?
Q19 We want to use the jack with a servomotor attached. Are there any precautions we should take?
Q20 Can an oil lubrication package be made upon request?
Q21 How often do I need to replace the grease in the reducer?
Q22 How do I replace the grease in the reducer?
Q23 Does the JWM model (machine screw type) provide for self-locking?
Q24 What happens when the stroke range is exceeded?
Q25 What are the advantages of the JWH (high lead ball screw type)?
Q26Does the screw of the Linipower Jack accept side load?  
Q27 Why is the bellows design for the JWH model (high lead ball screw type) a special package?
Q28 Is there a standard bellows type for the Travel Nut Package?
Q29The table-shaped end fitting are not able to be disassembled when trying to replace the bellows. What should I do?
 Answers
Q1Is the Linipower Jack environmentally friendly?  
A1

Although it depends on the usage conditions and calculation criteria, the Lini Power Jacks operate using about one-third of the power when compared with typical hydraulic type jacks.
This is because the Lini Power Jack operates the motor (consumes power) only when the screw shaft extends or retracts, while a hydraulic jack needs to feed oil continuously to keep the load even when the screw shaft does not extend or retract.
Such continuous operation of a hydraulic pump leads to much power consumption.
Moreover, the Lini Power Jack allows significant reduction of carbon dioxide emission as well as energy savings. It can be called an environmentally friendly product.

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Q2 Are the products compliant with the RoHS directive?
A2

With some exceptions of jacks with a motor, we can provide products that conform to the RoHS Directive. Make an inquiry with us for details.

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Q3 What is a rotation prevention mechanism?
A3

With a standard model, when the shaft end has been fastened or a rotation receiving mechanism is provided, the screw shaft does not rotate during lifting and lowering. If the screw shaft rotates, lifting and lowering is disabled, so that you need to prevent the rotation of the screw shaft of the jack.
Two methods are available: One is to machine a keyway in the screw to stop rotation with a key, and the other is to attach a nut at the end of the screw and stop rotation with the screw cover and the nut.

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Q4 What is the Travel Nut Package?
A4

In the standard package and the rod rotation-prevention package, the screw shaft moves up and down by rotating the nut. On the other hand, the mechanism of the travel nut package works to move the nut up and down by rotating the screw shaft.
The travel nut type does not require lifting/lowering space for the screw shaft, which saves space in the direction of movement.

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Q5What is the operating temperature for the Linipower Jack?
A5

The Linipower jack can operate in a state in which the jack surface temperature is in the range of -15 to 80℃.  

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Q6Can you make the Linipower Jack for outdoor use?  
A6

We can provide some measures to adapt it for outdoor use, such as painting or sealing. In an environment where water splashes directly on the equipment, you need to furnish a cover or similar protection.

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Q7 Can I use mechanical stops?
A7

When a mechanical stop is applied to ordinary motor drives, the stop creates shock, which can result in product breakdown.
A mechanical stop can be used only when the jack is operating below its basic capacity while controlling the torque with servo motors, etc.

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Q8 Can we use a travel nut type with its end being free?
A8

Yes, you can. Since, however, the allowable buckling load and allowable input rotation speed will be limited, pay due attention while using the equipment.
Refer to the technical data in the catalog "POWER CYLINDER LINIPOWER JACK" for details.

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Q9When we use two Linipower Jacks in conjunction, do they need a rotation prevention mechanism?  
A9

No, they don't need it. Note, however, that you must provide guides when using multiple jacks in conjunction.
The jack is designed not to generate a rotation force when a guide is provided.

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Q10Can the Linipower Jack handle being used laterally?
A10

Yes, the Linipower Jack can be used for horizontal applications.
However, certain considerations are needed for applications that involve bellows or long strokes, so in such cases, consult with us before use.

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Q11What are the points to be careful about when installing Linipower Jacks for interlocking operation?
A11

Multiple Lini Power Jacks are used in this application, so please take due care in leveling the jacks and ensuring their alignment, specifically for the jacks' core height and input shaft height.
You must install guides to tolerate side loads even for interlocked operation.

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Q12Is the Linipower Jack capable of oscillation?
A12

Linipower Jack can provide oscillation by using the I-shaped fitting for the end part and mounting it with a clevis mounting adapter or trunnion bracket (optional).  

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Q13 Under what circumstances is clevis mounting on both ends used?
A13

Clevis mounting on both ends is the best installation to employ for oscillation operation. Use for oscillation operations.

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Q14 Is it possible to use the JWB model (ball screw type) with a percentage duty cycle of 30% ED or higher?
A14

We can propose a relevant product solution once we have a full understanding of the environment in which you are intending to use our products.
Please let us know your operating conditions, including ambient temperature, load conditions, operating speed, and frequency.
* Percentage duty cycle means the percentage of operating time per 30 minutes.
In this case, there is an operating time of 9 minutes or more in a 30 minute unit.

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Q15 Does Tsubaki E&M provide one-side cutting or shaft end tapping on the input shaft, and plating, etc.?
A15

We can provide customized shafts as a special order. We have a wide variety of experience in delivering numerous customized products. Contact us for specific information.

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Q16 What is the backlash like for the input shaft?
A16

The backlash at the input shaft is caused by the clearance of screws and worm gears.
Thus, it depends on the model and size. Contact us for specific information.

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Q17 Do you ship the jack in the state in which a motor or geared motor has been attached to its input shaft?
A17

Models with a motor or geared motor are optionally available for the JWM (machine screw type), JWB (ball screw type), and JWH (high lead ball screw type).
There are standard products, quick delivery products, and made-to-order products depending on the model number and motor capacity.
Refer to the catalog "POWER CYLINDER LINIPOWER JACK" for details.

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Q18 Is it possible to turn the jack input shaft with a manual handle?
A18

A manual handle is offered as an option. It can be used with a machine screw type that has a self-locking function.

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Q19 We want to use the jack with a servomotor attached. Are there any precautions we should take?
A19

A servomotor is suitable for the applications which require high speed/high frequency operation.
There is a limit on the input rotation speed of the jack. Be extremely careful about the rotation speed of the servomotor.
For high frequency operation, select the JWB (ball screw type) or JWH (high lead ball screw type).

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Q20 Can an oil lubrication package be made upon request?
A20

We can provide this as a special order.
When ordering the oil lubrication type, contact us for specific information.

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Q21 How often do I need to replace the grease in the reducer?
A21

For frame sizes 025 and over, standard greasing intervals are set as follows according to the frequency of daily use.
In the case of high-frequency operation, it is recommended that grease is added once in three months.
For JWB models (ball screw type) and JWH models (high lead ball screw type), the upper bearing should also be greased every six months.

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Q22 How do I replace the grease in the reducer?
A22

Remove the hexagonal socket plug and pour in grease from the grease nipple until the grease overflows from the hexagon socket plug hole.
After supplying grease, wrap the seal tape around the hexagonal socket plug and tighten it so that there is no grease leakage.

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Q23 Does the JWM model (machine screw type) provide for self-locking?
A23

The JWM model (machine screw type) has self-locking properties in theory, but it may not work when there is vibration or shock.
In such cases, a brake system is required.

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Q24 What happens when the stroke range is exceeded?
A24

With the standard specifications of the JWB (ball screw type) and JWH (high lead ball screw type), the screw is equipped with a stopper so that it does not fall off. With the JWM (machine screw type), however, the screw may possibly fall off.
In such a case, some mechanical/electrical control is required to ensure that the jack will be used within the stroke range.
* Note that the stopper is a simple preventive measure. The screw may fall off if any larger force is applied.

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Q25 What are the advantages of the JWH (high lead ball screw type)?
A25

The screw lead is larger than the normal JWB models (ball screw type) and is suitable for high-speed operation.
When used at the same speed, the JWH operates at lower input rotation speed of the driving source/reducer than that of the JWB, which is effective for reducing the noise from the jack.

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Q26Does the screw of the Linipower Jack accept side load?  
A26

The JWB (ball screw type) cannot accept side load. The JWM (machine screw type) can withstand side load to a certain degree as long as it is stationary.
Refer to the catalog "POWER CYLINDER LINIPOWER JACK" for details.

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Q27 Why is the bellows design for the JWH model (high lead ball screw type) a special package?
A27

The JWH model (high lead ball screw type) is intended for high-speed operation. An air hole is provided to quickly release the air from the bellows, which makes the model a special package.

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Q28 Is there a standard bellows type for the Travel Nut Package?
A28

The Travel Nut Package features a structure in which the nut moves along the screw shaft. The travel stroke determines the length of the bellows, and the nut mounting direction determines the bellows' diameter.
For this reason, the bellows is selected accordingly. Similarly, how the bellows is mounted on the equipment can vary.

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Q29The table-shaped end fitting are not able to be disassembled when trying to replace the bellows. What should I do?
A29

The table-shaped end fitting is fixed until screw end with glue.
It is fixed with two screws to prevent untighten.
It might be broken the product if you remove the table-shaped end fitting forcebly.Please return products to us if necessery.
Please ask us when you would like to disassemble the fitting.

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