Ball screws and ball nuts

The Form Talysurf® PGI NOVUS provides measurement along the full thread profile on both sides of a ball screw or ball nut. Using helix angle correction the profile is transformed to represent measurements perpendicular to the thread.

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    Ball screws & ball nuts

    Precise measurement of upper and lower axial profiles

    PGI NOVUS Dual Bias Gauge

    The ball screw is aligned using its shaft or its thread and measured. The precise relationship between the upper and lower thread profiles is established following automated alignment, measurement and helix angle corrections.

    Axial analysis

    Full surface and dimensional assessment, including pitch circle diameter (PCD)

    User defined analysis templates are automatically applied and ‘Pass / Fail’ criteria and tolerances can be set to design requirements.

    Analysis solutions

    • Helix angle correction 

    • Contact points 

    • Axial surface finish 

    • Radius 

    • Form 

    • Gothic arch 

    • Pitch 

    • PCD and tolerances

    Precise auto-alignment ensures true axial thread profiles


    1.  Alignment on shafts - Crest positions on the shaft are used to determine the angular rotation required for perfect    alignment using the Form Talysurf® PGI NOVUS rotary stage. This ensures that the true thread profile is measured.

    2.  Alignment on threads section - Crest positions on the thread are used to find the angular rotation required.

    Helix angle correction and thread analysis


    Helix angle correction uses the axial measurement taken along the gothic thread profile, transforming it so that it represents a measurement taken perpendicular to the thread

    This allows for tolerancing and analysis of the profile against the design drawing and software simulation of the ball bearing fit within the gothic thread. 

    Critical gothic arc features such as contact angle, arc radii and distance between centres can be determined as shown in the diagram below.
     
     
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