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Related Concept Videos

Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Net Torque Calculations01:19

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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Mechanical Efficiency of Real Machines01:14

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The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
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Electro-mechanical Systems01:19

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
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Screw: Problem Solving01:21

Screw: Problem Solving

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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.
To evaluate the...
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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A Method for Evaluating Timeliness and Accuracy of Volitional Motor Responses to Vibrotactile Stimuli
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Accuracy of different electronic torque drivers: A comparative evaluation.

Byeong-Dae Ko1, KeunBaDa Son2,3, Seok Hyon Kang3

  • 1Department of Dentistry, Graduate School, Kyungpook National University, Daegu, Republic of Korea.

The Journal of Advanced Prosthodontics
|January 4, 2020
PubMed
Summary
This summary is machine-generated.

This study evaluated electronic torque drivers for implant fixture loosening. NSK and SAESHIN drivers demonstrated the highest accuracy at specific torque levels, highlighting the need for calibration.

Keywords:
AccuracyElectronic torque driverImplant fixtureLoosening torque

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Area of Science:

  • Dental Implantology
  • Biomaterials Engineering
  • Mechanical Engineering

Background:

  • Accurate torque control is crucial for dental implant stability and longevity.
  • Electronic torque drivers are widely used in implantology, but their precision can vary.
  • Understanding the accuracy of different drivers is essential for predictable clinical outcomes.

Purpose of the Study:

  • To evaluate the loosening torque of dental implant fixtures.
  • To assess the accuracy of three different electronic torque drivers (W&H, SAESHIN, NSK).

Main Methods:

  • Three types of electronic torque drivers were used on AnyOne implant fixtures.
  • Screws were tightened to manufacturer-recommended torques and re-tightened after 10 minutes.
  • Loosening torques were measured using an MGT12 torque gauge at 15, 25, and 35 Ncm, repeated 10 times per condition.
  • Statistical analysis included one-way ANOVA and Kruskal-Wallis tests.

Main Results:

  • Significant inter-group differences in loosening torques were observed at 15 Ncm and 25 Ncm (P<.05).
  • The NSK driver exhibited the highest accuracy, followed by SAESHIN and W&H.
  • At 35 Ncm, SAESHIN showed the closest loosening torque, with no significant difference between NSK and W&H.

Conclusions:

  • SAESHIN and NSK drivers demonstrated the most accurate loosening torque measurements at specific settings (35 Ncm for SAESHIN; 15 and 25 Ncm for NSK).
  • Loosening torque accuracy is influenced by both tightening torque and the electronic torque driver used.
  • Periodic calibration of electronic torque drivers is recommended to ensure consistent and reliable measurements in clinical practice.