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Applications of mechanical systems and technology
Published in Alan Darbyshire, Charles Gibson, Mechanical Engineering, 2023
Alan Darbyshire, Charles Gibson
Screw fastening and rivets are the most widely used semi-permanent fastenings in engineered products. Screwed fastenings on covers and internal components allow access and removal for maintenance and repair. Components joined by rivets are not intended to be separated, but if the need arises this can be achieved by grinding off the rivet heads or drilling out the rivets. Most countries throughout the world now use the International Organisation for Standardisation (ISO) metric screw thread. The USA is an exception where feet and inches are still in widespread use. Small sized screw fastenings, particularly those used in electrical and IT equipment, employ the British Association (BA) screw thread. Although this is British in origin, it is used internationally in these applications. The form of these screw threads is shown in Figure 4.12.
RoamFab: A Design Tool for Reconfiguring Parameterized Mechanisms to 3D Models With Structural Optimization
Published in International Journal of Human–Computer Interaction, 2022
Shijian Luo, Zhitong Cui, Jiancheng Gu, Ting Chen, Chengyi Shen, Yang Lu, Yanan Wang, Preben Hansen
To enable two objects to rotate relative to each other, RoamFab provides three types of hinge mechanisms shown in Figure 1. The first hinge mechanism embeds two separated parts for revolute motion and can be 3D printed in place along the rotating axis. For conditions where the user needs to assemble a hinge manually, we provide the second hinge mechanism consisting of three parts, where the ISO metric screw thread is used to hold the two parts together. The third hinge mechanism, also known as a cylindrical joint with two degrees of freedom, can be used when the user does not need the limit parts at both ends of the rotating shaft to provide a single-axis sliding function. Essential design for hinge mechanisms is the printing tolerance between the inner part and the outer part that allows them to hinge.