Machinery used: Table lifter, stage lifting device, conveyor line switching device, etc.

Layout... Interlocking pattern (4 units, 6 units, etc.), drive, coupling, etc.

Maximum load (W)..... Mass of load or workpiece N{kgf}

Screw shaft speed (V)..... Required speed of the jack m/min

Stroke: Actual stroke used mm

Screw type: Ball screw type (JWB), High lead ball screw type (JWH), Trapezoidal Screw type (JWM)

Mounting type: Basic type (for lifting or hanging, with or without anti-rotation device), traveling nut type (for lifting or hanging)

Installation condition..... Base fixed, shaft end clevis, etc. - Buckling consideration when compressive load is applied

Expected life..... Jack service life (JWB, JWH only)

1. Calculation of the correction load Ws

Considering the nature of the load, calculate the corrected load Ws by referring to Service factor (Table 1).

Corrected load Ws (N{kgf}) = Maximum load W (N{kgf}) × Service factor Sf

Table 1. Service factor Sf

Note: The above Service factor are general guidelines and should be determined taking into consideration the conditions of use.

2. Calculating the load W per jack

The load W per jack is calculated from the corrected load Ws. In the case of linked operation, refer to Multiple factor (Table 2) for calculation.

Table 2. Multiple factor fd

3. Tentatively select the model number of Linipower Jack

Refer to the "Points to consider when tentatively selecting" to tentatively select the model number of the jack.

Points to consider when tentatively selecting a product

• 1. The worm speed ratio is tentatively selected based on the screw shaft speed. If it is difficult to determine, consider speed ratio H.
• 2. Select the stroke with a margin of safety in mind.
• 3. Select options as needed.

4. Checking buckling and screw shaft rotation speed

• 1. Consideration of allowable buckling load
  If a compressive load is applied, make sure that it is below the allowable buckling load. (Here reference)
  If the allowable value is exceeded, increase the size of the jack and recalculate.
• 2. Allowable screw shaft rotation speed
  In the case of a traveling nut specification, check that the screw shaft rotation speed is below the allowable speed. (Here reference)
  If the allowable value is exceeded, increase the size of the jack and recalculate.

5. Check the required input rotation speed

The required input rotation speed of the jack is calculated from the required screw shaft speed.

6. Check the required input torque

Calculate the required input torque.

• Note)
  Please refer to Major Specifications page for each product for screw lead, worm speed ratio, overall efficiency, and no-load idling torque.
  Please pay attention to the units of screw lead. Example) 8mm → 0.008m

7. Check the required input capacity

8. Consideration of allowable overhang load

When installing a sprocket, gear, belt, etc. on the input shaft, check that it is below the allowable overhang load (see here).

If it exceeds the allowable value, increase the size of the jack and recalculate.

9. Checking the lifespan (JWB and JWH types only)

Check whether the expected life span is met (see here).

If you want to increase the expected travel distance, increase the jack size and recalculate.

*Lifespan calculations cannot be performed for JWM (Trapezoidal Screw) types.

10. Deciding on options

Select the option according to your usage conditions.

11. Deciding the jack body model number

The official model number of Linipower Jack body will be determined.

Motor Selection

Calculate the required capacity Pt of the drive source for interlocking and select the drive source

1. Calculating the total required torque Tt of the drive source

Calculate the required torque _{T1 to T4} on the drive source side for each jack, and add them together to calculate the total required torque Tt for the drive source.

[Required torque per jack]

T _{1 to 4} = T (gearbox efficiency) ^{Number of gearboxes}

[Total required torque of drive source]

Tt = T₁ + T₂ + T₃ + T₄

T _{1 to 4}: Required torque on the drive source side of each jack N・m{kgf・m}

T: Required input torque of the jack body N・m{kgf・m}

Gearbox efficiency: Generally taken as 0.9.

Tt: Total required torque of the drive source N・m{kgf・m}

When four units are connected (Figure 1), T _{1 to 4} = T0.9 ².

Figure 1

2. Check the allowable input shaft torque

Check that the required input torque of the jack is equal to or less than the allowable input torque of the selected jack.

example)
When the jacks are arranged in a straight line as shown in Figure 2, the required input torque of two jacks is transmitted to the input shaft of the jack on the drive side.
Check that the torque of these two units is below the allowable input shaft torque.

Figure 2

Required torque for jack A only: T _A

Required torque for jack B only: T _B

Required torque of driving source T _t = T _A + T _B < Allowable input shaft torque

3. Calculation of the required drive source capacity Pt

The required drive capacity Pt is calculated from the input rotation speed N and the total required torque Tt calculated in 1.

gearbox

Select based on input rotation speed and allowable torque.

Please refer to the separate catalog for Tsubaki Miter Gear Box.

Coupling

Select based on the allowable torque and maximum shaft diameter.

Please refer to the Tsubaki Coupling catalog.

4-unit linked pattern

*See above for T1 to T4