Maintenance Info
  • 2021/08/10 8:00
    2021/08/12 18:00

Sizing  Linipower Jack

  • Select an appropriate model for your application.
  • Enter the sizing conditions and then click the [Show selection] button at the bottom of the screen.
  • This is the calculation software for the selection of a Jack.
    Please refer following steps for the selection of multiple units.[STEP1. Selecting Your Linipower Jack 2. Load per jack]

Entering your selection criteria

Enter the sizing conditions.

Lift load ( Maximum ) W0 =  [kN]  [kgf]

Table 1  Service factor  sf

Load characteristics Usage examples Service factor
Smooth operation without impact
Load inertia   Low
Opening/closing a valve
Conveyor switching device
Operation with light impact
Load inertia   Medium
Transfer systems
Lifter operations
Operation with large impact/vibration
Load inertia   High
Object conveyance using trolleys; Positioning retention in rolling machines 1.5~3.0

Note) This table represents general guidelines. Determine the usage factor based on actual usage conditions.

Lift load ( Minimum ) W1 =  [kN]  [kgf]
Service factor Sf =
Allowable buckling load W2 =  [kN]  [kgf]
Preferred lift speed V' =  [m/min]  [mm/s]
Stroke ST0 =  [mm]
Actual stroke ST =  [mm]
Frequency of operation [ Reciprocations /Hr]× [Hr/ day ]× [ day / year ]

Selecting the Linipower Jack specifications

Select the specifications of the Linipower Jack.

[Show the reference number system.]

JW M 050 U S H 10 U

Linipower Jack

Basic Capacity

Worm Gear Reduction Ratio
  Refer to the detailed information for the reduction ratio.

Nominal Stroke

Flange Installation
※ Indicate only for models with a travel nut.
Screw Type
S:Basic model
M: Rotation Prevention
R: Travel Nut Package
Screw type
M: Machine Screw
B: Ball screw
H: High Lead Ball Screw
Mounting style
U: For lifting
D: For suspending
Jack type Jack size Mounting style Worm Reduction Ratio Flange Installation End fitting Bellows Clevis mounting adapter
Sensor options Input options
With Counter LS Internal LS With Potentiometer With encoder With motor

Jack model No.  

Basic Capacity [kN] Total Efficiency  ηJ
Screw Root Dia.  d [mm] Maximum Allowable Input Capacity [kW]
Screw lead  L [m] Allowable free wheeling torque without load  T0 [N・m]
Worm Reduction Ratio  R Allowable Torque on Input Shaft [N・m]

Show selection :

Checking the actual speed

Enter the motor speed and the actual total reduction ratio.

Motor speed Nm =  [r/min]
Required input speed N' = V'/L×R =  [r/min]
Required reduction ratio i' = Nm/N' =
Reference motor rotational speed
50Hz 1500 r/min
60Hz 1800 r/min
Actual total reduction ratio i = ( Enter the total reduction ratio from the jack input shaft to the drive motor. )
Actual lifting speed V = Nm×L/(i×R) =  [m/min]


Required torque on input shaft T = W0×Sf×1000×L/(2π×R×ηJ)+T0 = [N・m]
Required reverse torque ( Reference ) T' = W0×Sf×1000×L×ηJ/(2π×R)-T0 = [N・m]
Input speed N = V/L×R = [r/min]
Required input capacity P = T×N/9550 = [kW]
Moment of Inertia on Input Shaft IJ = W0×1000/g×(L/2π×R)2 = [kg・m2]

Show selection :

Buckling Strength Check

Select the installation conditions.

Installation state
Support coefficient m =
Distance between points of load L1 =  [mm]
Buckling strength PCR = m×(d2/L1)2/1000 =  [kN]
Buckling safety rate SF = PCR/(W2×Sf) =  (>=4)

Installation state  [ Click to enlarge ]

Fixed base - Free shaft end

Both ends with clevis

Fixed base - Fixed shaft end

Standard distance Stroke Fitting size Clevis size

Show selection :

Checking the allowable screw shaft speed ( Travel nut only )

Support coefficient n =
Distance between points of load L2 =  [mm]
Allowable screw shaft speed NC = 96×n×d×106/L22 =  [r/min]
Screw shaft speed NS = N/R =  [r/min] (NC >= NS)

Show selection :

Checking the use frequency

Operating hours ts = ST/(V×1000) =  [min] 
Percentage duty cycle (%ED) %ED = [ Reciprocations /Hr]×2× Operating hours ×100/60 =  [%ED] 

Show selection :

Calculation of Expected Life ( Machine screw type )

Annual travel distance Ly = ST×2×[ Reciprocations /Hr]×[Hr/ day ]×[ day / year ]×10-6 =  [km]
Expected life Z = (JWM050 or less:5km, JWM100 or more:1km)/Ly =  [ year ]

Calculation of Expected Life ( Ball screw type )

Equivalent load PE = (W0×Sf×2+W1)/3 =  [kN]
Ball screw load capacity C =  [kN]
Short stroke correction factor fs =
Operating condition factor fd =
Quenching hardness correction factor fh =
Life correction factor f1 = (PE×fd)/(C×fh×fs) =
B10 Lifetime travel distance L10 = 250/f13 =  [km]
Annual travel distance Ly = ST×2×[ Reciprocations /Hr]×[Hr/ day ]×[ day / year ]×10-6 =  [km]
Expected life Z = L10/Ly =  [ year ]

Calculation of Expected Life ( High lead ball screw type )

Contact us for the calculation of expected life limit for High-Lead Type.

Selection results

Model No.

Required input capacity


Reduction ratio

< Notes >
This selection is based on the theoretical calculation value, and we do not guarantee the selecting results. Please well understand the formula of this selection and give the leeway to the calculation result, and make the final decision of product used on