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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
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Updated: Jul 7, 2025

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Large gear structure assembly method based on uncalibrated image visual servo guidance.

Shengjie Kong1, Xiang Huang1

  • 1College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

The Review of Scientific Instruments
|December 22, 2023
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Summary

This study introduces an automated assembly method for large gear structures using uncalibrated visual servo guidance. The new approach significantly improves assembly efficiency and accuracy compared to traditional manual methods.

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Area of Science:

  • Robotics and Automation
  • Mechanical Engineering
  • Computer Vision

Background:

  • Reliability of transmission systems depends on large gear structure assembly quality.
  • Manual assembly methods face challenges like complexity and low efficiency.

Purpose of the Study:

  • To propose an automated assembly method for large gear structures using uncalibrated image visual servo guidance.
  • To enhance assembly efficiency and accuracy in large gear systems.

Main Methods:

  • Developed a three-module approach: task function for projective homography, image Jacobian matrix estimation, and adaptive servo controller design.
  • Utilized uncalibrated image visual servo guidance for end-effector control.
  • Mapped gear image changes to end-effector motion in a parallel mechanism.

Main Results:

  • The proposed method dynamically guides the end-effector for precise attitude adjustments.
  • Experimental results show superior performance over alternative methods.
  • Demonstrated significant enhancement in assembly efficiency.

Conclusions:

  • The uncalibrated visual servo guidance method offers a robust solution for automated large gear structure assembly.
  • This approach has broad applicability in automated manufacturing of large mechanical components.