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  3. Ball Spline
  4. Point of Selection

Point of Selection Selection flow based on function conditions

The following is a flowchart to reference when selecting a Ball Spline.

  1. 1

    Setting Conditions

    • Stroke length: Ls
    • Required service life
    • Velocity: V
    • Dimensions (No.of spline nuts, span)
    • Magnitude of the applied load: W
    • Installation direction
    • Mounting space
    • Environment
    • Operating frequency (duty cycle)
    • Accuracy
  2. 2

    Selecting a Type

    Select a type that meets the conditions from the classification Selecting a Type table for Ball Splines and temporarily decide a rough size.

  3. 3

    Calculate the static safety factor

    Calculating the Static Safety Factor static load rating and the maximum applied load.

  4. 4

    Studying the Spline Shaft Strength

    • Estimating the spline shaft diameter
    • Permissible load on the spline shaft
    • Estimating the spline shaft length
    • Displacement of the spline shaft (deflection, torsion)
    • Method for fixing the spline shaft
  5. 5

    Predicting the Service Life

    Calculate the applied load and obtain thenominal life from the life calculation formula.

  6. Comparison with the
    required service life

    PASS: Proceed to "Selecting a Preload."
    FAIL: Return to "1. Setting Conditions"/"2. Selecting a Type."

  7. 6

    Selecting a Preload

    Select a clearance in the rotational direction.

  8. 7

    Determining the Accuracy

    Select an accuracy grade

  9. 8

    Selection According to the Environment

    • Determining a lubricant
    • Determining a surface treatment
    • Determining a lubrication method
    • Designing contamination protection

    * Please refer to the lubrication, surface treatment, and contamination protection sections on the ball spline options page.

  10. Selection Completed