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Related Experiment Video

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A 3D-Printed Device for Unconstrained Grip Force Measurements: Design and Application in a Human Experiment.

Mahdiar Edraki, Jim Papadopoulos, John Peter Whitney

    IEEE Transactions on Haptics
    |July 21, 2025
    PubMed
    Summary

    A new device measures grip force around cylindrical handles without altering posture. This low-cost, accurate tool sums radial forces, benefiting human motor control and robot interaction research.

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    Area of Science:

    • Biomechanics
    • Human-Robot Interaction
    • Motor Control

    Background:

    • Grip force measurement is crucial for understanding human motor control and interaction with objects.
    • Existing devices may constrain grasp posture or lack comprehensive force measurement.
    • Accurate and versatile grip force sensing is needed for advanced research applications.

    Purpose of the Study:

    • To develop and validate a novel measurement device for assessing grip force around cylindrical handles.
    • To enable grip force measurement without constraining the user's grasp posture.
    • To demonstrate the device's utility in a human experiment.

    Main Methods:

    • A measurement device was designed using flexures to mechanically sum radial grip forces.
    • The device incorporates off-the-shelf and 3D-printed components for ease of construction and cost-effectiveness.
    • Calibration and load application tests were performed to assess accuracy and consistency.

    Main Results:

    • The device accurately measures grip forces up to 200 N, summing forces applied at any location on its load plates.
    • Post-calibration error was less than 1.5% of full-scale.
    • Load variation across different plates was minimal, showing less than 1.5 N difference.

    Conclusions:

    • The developed device offers an accurate, versatile, and low-cost solution for measuring grip force.
    • Its ability to measure force without constraining posture opens new avenues in motor control and human-robot interaction research.
    • The device's practical utility was successfully demonstrated through a force-tracking experiment.