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Oldham Coupling Shaft Misalignment & Radial Load Calculator

Oldham couplings transmit constant-velocity homokinetic torque between parallel offset shafts by allowing a floating center disc to reciprocate across orthogonal tongue-and-groove hubs.

Radial center-to-center offset between driving and driven shafts.

Nominal operational shaft torque transmitted through the coupling.

Shaft rotational speed in revolutions per minute.

Effective contact pitch radius of torque-transmitting center disc.

Coefficient of sliding friction (0.08 for lubricated acetal/Delrin, 0.15 for bronze/steel).

Calculated Result
432 N

Induced Radial Bearing Load

Induced Radial Bearing Load

432 N (97.1 lbf)

Tangential Drive Force (F_t)

1800 N

Peak Slider Velocity (v_slide)

0.188 m/s

Center Disc Stroke

3 mm

Frictional Heat Generation

40.7 W

Calculation Breakdown

  1. Tangential Driving Force at Pitch RadiusF_t = T / R_p = 45 N·m / (25/1000) m = 1800 N
  2. Radial Bearing Reaction from Floating Disc FrictionF_radial = 2 × μ × F_t = 2 × 0.12 × 1800 N = 432 N

Coupling Forces & Velocities

Interactive visualization based on your current inputs

Value
0.04590135180Drive Force (N × 0.1)Radial Load (N × 0.1)Slider Stroke (mm)Heat (W)ParameterValue

What Is the Oldham Coupling Shaft Misalignment & Radial Load Calculator?

The Oldham Coupling Shaft Misalignment Calculator analyzes mechanical kinetics and bearing reactions caused by parallel shaft offset in rotating machinery.

How Does the Oldham Coupling Shaft Misalignment & Radial Load Calculator Work?

It computes the sliding motion of the floating disc and evaluates how friction converts transmitted torque into undesirable radial forces on motor and load bearings.

Oldham Coupling Shaft Misalignment & Radial Load Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

F_t = \frac{T}{R_p}, \quad F_{radial} = 2 \mu F_t, \quad v_{slide} = \Delta \omega, \quad P_{heat} = \mu F_t v_{slide}

Kinematic Coulomb sliding formulation quantifying lateral reaction forces imparted onto supporting bearings.

How to Use the Oldham Coupling Shaft Misalignment & Radial Load Calculator

  1. Enter parallel radial misalignment offset in mm.
  2. Specify transmitted torque and operating RPM.
  3. Input coupling pitch radius and disc friction coefficient.

Step-by-Step Example Calculation

Stepper Motor Servo Drive Oldham Coupling

Input Values:

parallelOffsetDeltaMm:1.5
transmittedTorqueNm:45
operatingSpeedRpm:1200
couplingPitchRadiusMm:25
slidingFrictionCoeff:0.12
Worked Steps: Generates 3.0 mm sliding stroke, 1,800 N driving force, 432 N induced radial load on bearings, and 40.7 W frictional heat.

Understanding Your Result

Induced Radial Bearing Load: Side load applied to adjacent shaft bearings.

Slider Stroke & Velocity: Wear rate indicators for the floating center disc.

Frictional Heat: Thermal power generation within the coupling assembly.

Factors That Affect the Result

  • Higher torque and higher friction coefficients linearly increase bearing radial reaction loads and heat.

When Should You Use This Calculator?

  • Precision CNC feed drives, servo positioning actuators, automated packaging machinery, and pumps with parallel shaft offset.

Assumptions & Limitations

  • Assumes purely parallel misalignment without significant angular shaft skew.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Based on mechanical machine design kinematics per Shigley and Norton.

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