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Machines

Machines

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. One example of a machine is the cutting plier, which is used to cut wires by applying forces to its handles. When equal and opposite forces are exerted on the handles of the cutting plier, they cause the cutting edges to come together and apply equal and opposite reaction forces on the wire, which are greater than the applied forces.
A free-body diagram of the...

Unsymmetric Loading of Thin-Walled Members: Problem Solving

Unsymmetric Loading of Thin-Walled Members: Problem Solving

The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...

Transmission Shafts: Problem Solving

Transmission Shafts: Problem Solving

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.
Next, use bending moment diagrams for the shaft to...

Unsymmetric Loading of Thin-Walled Members

Unsymmetric Loading of Thin-Walled Members

Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...

Design of Transmission Shafts - Stress Analysis

Design of Transmission Shafts - Stress Analysis

Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...

Machines: Problem Solving II

Machines: Problem Solving II

Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.

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Related Experiment Video

Updated: Jul 16, 2026

Surrogate Model Development for Digital Experiments in Welding

Surrogate Model Development for Digital Experiments in Welding

Published on: March 28, 2025

Decoding Multidimensional Machining Loads: iKIT Wireless Extrasensory Toolholder and Parametric Analysis in Aluminum

Qian Qiao¹, Dawei Guo^1,2, Chi-Tat Kwok³

¹IDQ Science and Technology (Hengqin, Guangdong) Co., Ltd., Zhuhai 519000, China.

Sensors (Basel, Switzerland)

|July 15, 2026

Summary

A new wireless toolholder enables real-time monitoring of forces in computer numerical control (CNC) machining. This smart toolholder provides accurate data for digital twins and adaptive control, improving manufacturing processes.

Keywords:

aluminum alloy milling dynamics multi-axis force wireless extrasensory toolholder

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Application of Design Aspects in Uniaxial Loading Machine Development

Application of Design Aspects in Uniaxial Loading Machine Development

Published on: September 19, 2018

Area of Science:

Manufacturing Engineering
Sensor Technology
Mechanical Engineering

Background:

Smart manufacturing relies on real-time monitoring of forces in computer numerical control (CNC) machining.
Existing methods often lack the fidelity or in-situ capabilities required for complex machining environments.

Purpose of the Study:

To introduce an innovative wireless extrasensory toolholder (iKIT) for high-fidelity, in-situ sensing.
To monitor cutting force, torque, and bending moments in real-time during CNC machining.
To validate the system's performance and data accuracy for advanced manufacturing applications.

Main Methods:

Designed and implemented a wireless toolholder system with miniature sensors.
Utilized a high-bandwidth wireless transmission and noncontact power supply.
Conducted comprehensive milling tests on aluminum alloys, varying process parameters.

Main Results:

The iKIT system accurately detected changes in multidimensional mechanical loads due to process parameter variations.
Torque and bending moments showed strong positive correlations with feed rate and depth of cut.
These loads were negatively correlated with spindle speed, indicating thermal effects.

Conclusions:

The developed smart toolholder provides a reliable hardware framework for integrated sensing in machining.
The system delivers accurate data crucial for supporting digital twin models and adaptive control strategies.
This technology enhances real-time process monitoring and optimization in smart manufacturing.