Acme Screw Jack
Acme Screw Jack
Acme Screw Jack
Engineering Calculations & Formulas
Basic Engineering Calculations
Input Speed
n₁ rev/min
Input Torque
T N·m
Input Power
P kW
Formula Symbols & Variables
W=
Mass (Weight)
V=
Screw shaft speed (mm)
L=
Screw Lead pitch (m)
R=
Gear Ratio
T=
Starting input torque
T₀=
No load torque
η=
Starting efficiency in percent
P=
Starting input power
π=
3.14
Example Calculation
RMSJ-025 Machine Screw Jack
Stroke
100mm
Lead Pitch
5mm
Ratio
24
Lifting Load
150kg
Input RPM
100 r/min
Input RPM =
100/5 × 24 = 20 × 24 =
480 rev/min
Input Torque =
(150kg × 5 / 2π × 24 × 21) + 0 =
4.74 Nm
Input Power =
4.74 × 480 / 9550 =
0.23 kW
Note: Considering its part of another page. Calculations assume standard conditions with no-load torque (T₀ = 0).
Key Formulas:
n₁ = (Input RPM / L) × R
T = (W × L / 2π × R × η) + T₀
P = (T × n₁) / 9550
T = (W × L / 2π × R × η) + T₀
P = (T × n₁) / 9550
Constants:
π = 3.14
9550 = Conversion factor
η ≈ 21% (typical)
9550 = Conversion factor
η ≈ 21% (typical)
