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Selection Criteria Selection flow based on function conditions

When selecting a ball screw, it is necessary to consider various parameters that depend on the operating conditions. The following is a flowchart for selecting a ball screw.

  1. 1

    Determining the Operating Conditions

  2. 2

    Selecting Ball Screw Accuracy

    • Lead Angle ccuracy
    • Axial Clearance of Precision Ball Screws
    • Axial Clearance of Rolled Ball Screws
  3. 3

    Estimating the Shaft Length

  4. 4

    Selecting a Lead / Selecting a Shaft Diameter

  5. 5

    Selecting a Method for Mounting the Ball Screw Shaft

  6. Considering the Permissible Axial Load

    PASS: Proceed to "Selecting the Permissible Rotational Speed."
    FAIL: Return to "4. Selecting a Lead / Selecting a Shaft Diameter" (or "5. Selecting a Method for Mounting the Ball Screw Shaft").

  7. Selecting the Permissible Rotational Speed

    PASS: Proceed to "6. Selecting a Model (Type of Nut)."
    FAIL: Return to "4. Selecting a Shaft Diameter" (or "4. Selecting a Lead" or "5. Selecting a Method for Mounting the Ball Screw Shaft")

  8. 6

    Selecting a Model (Type of Nut)

  9. Calculating the Permissible Axial Load

    PASS: Proceed to "Considering the Service Life."
    FAIL: Return to "6. Selecting a Model (Type of Nut)" (or "4. Selecting a Shaft Diameter").

  10. Considering the service life

    PASS: Proceed to "Considering the Rigidity."
    FAIL: Return to "6. Selecting a Model (Type of Nut)" (or "4. Selecting a Shaft Diameter").

  11. Considering the rigidity

    PASS: Proceed to "Considering the Positioning Accuracy."
    FAIL: Return to "4. Selecting a Shaft Diameter" (or "5. Selecting a Method for Mounting the Ball Screw Shaft" or "6. Selecting a Model (Type of Nut)").

  12. Considering the positioning accuracy

    PASS: Proceed to "Considering the Rotational Torque."
    FAIL: Return to "2. Selecting Ball Screw Accuracy: Lead Angle Accuracy" (or "4. Selecting a Shaft Diameter" or "5. Selecting a Method for Mounting the Ball Screw Shaft" or "6. Selecting a Model (Type of Nut)").

  13. Considering the Rotational Torque

    PASS: Proceed to "Investigating the Drive Motor."
    FAIL: Return to "4. Selecting a Lead" (or "4. Selecting a Shaft Diameter" or "6. Selecting a Model (Type of Nut)").

  14. 7

    Considering the Driving Motor

  15. 8

    Protecting an LM System

    Please refer to the lubrication and contamination protection sections on the ball screw options page.

  16. Selection Completed