scholarly journals Computer Aided Design and Analysis of Tapping Tool with Diametrical flexibility

2017 ◽  
Vol 7 (2 (S)) ◽  
pp. 226
Author(s):  
Satish Bahale ◽  
Amit Shende
Keyword(s):  
Computer Aided Design ◽  
Metal Cutting ◽  
Longitudinal Axis ◽  
Rotational Energy ◽  
Machined Surface ◽  
Machine Shop ◽  
Computer Aided ◽  
Cutting Operation ◽  
Cad Tool ◽  
Aided Design

Tapping operation which refers to production of internal threads forms an integral part of any machine shop and it is intended to provide semi permanent fastening to the components of product so as to lend themselves for repairs and replacements. Though various methods of internal threading are available such as internal threading by milling, grinding or forming but internal threading by metal cutting which employs a tapping tool is indeed the mostly used for products where accuracy forms the base of evaluation. Last few decades have seen the growth of automobile industries and has resulted in development of its allied operations of which tapping is one of the crucial operation performed. The conventional tapping operation which surely involves rotating the tool and feeding past the pre drilled hole to create the contours called as internal threads and this is followed by withdrawal of tapping tool by reversing it with aid of rotational energy. The present paper attempts to design and analyze a tapping tool which will have no requirement of reversing of tool at the end of cutting operation which is essentially done by changing the design of conventional solid tap. The solid tapping tool is divided into two parts along the longitudinal axis and a mechanism is prompted to give the two parts actuation which would shrink at the end of cutting operation to be dragged out of hole without damaging the machined surface and providing the diametrical flexibility to engulf other diameters to be machined. This tapping tool with diametrical flexibility is designed in CAD tool named as CATIA V5 and efficiently analyzed by using FEA technique which is the working phenomenon for ANSYS.

scholarly journals Comparative Evaluation of Mechanical Properties and Wear Ability of Five CAD/CAM Dental Blocks

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2252 ◽  
Author(s):  
Yin ◽  
Jang ◽  
Lee ◽  
Bae
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Vickers Hardness ◽  
Computer Aided Design ◽  
Filler Content ◽  
Machined Surface ◽  
Volume Percentage ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design

This study compares the mechanical properties and wear ability of five CAD/CAM (computer-aided design/computer-aided manufacturing) millable dental blocks. All the discs, including Amber Mill Hybrid, Vita Enamic, Katana Avencia, Lava Ultimate, and Amber Mill, were cut in dimensions of 1.2 mm in thickness and 12 mm in diameter, polished to a machined surface, and immersed in distilled water for seven days. Vickers hardness was measured and the indentations were observed using microscope. The discs were brushed under a 150 g load. Mean surface roughness (Ra) and topography were determined after 100,000 cycles. Finally the biaxial flexure strength of the discs was measured and the broken surfaces were observed using scanning electron microscopy (SEM). The data was subjected to Weibull analysis. All data were analyzed by one-way analysis (ANOVA). The results of Vickers hardness are shown as: Amber Mill > Vita Enamic > Amber Mill Hybrid > Lava Ultimate > Katana Avencia. Katana Avencia showed the highest volume percentage reduction and the roughest surface after toothbrushing. The biaxial flexural strength is shown as: Amber Mill > Katana Avencia > Lava Ultimate > Amber Mill Hybrid > Vita Enamic. All the tested materials exhibited varying degrees of mass loss and surface roughness. The properties of the composite materials are related to the filler content, filler volume, and polymerization methods.

A NUMERICAL SIMULATION INVESTIGATION OF THE HYDRODYNAMIC MOTIONS OF A SHIP ADVANCING IN WAVES

2021 ◽  
Vol 156 (A4) ◽  
Author(s):  
D C Lo ◽  
D T Su ◽  
J T Lin
Keyword(s):  
Computer Aided Design ◽  
Degrees Of Freedom ◽  
Fluid Dynamic ◽  
Wave Interaction ◽  
Six Degrees Of Freedom ◽  
Ship Model ◽  
Computer Aided ◽  
Cad Tool ◽  
Aided Design ◽  
Wave Incidence

This study establishes a relationship diagram of the ship-wave interaction under a ship advancing in waves. A finite difference method based on volume of fluid (VOF) principles was used to simulate the hydrodynamic motions of a ship advancing in waves. A ship model was constructed using a computer aided design (CAD) tool. The computational fluid dynamic (CFD) technique was used to calculate the hydrodynamic motions effect of a ship sailing in waves at varying angles of incidence. This study investigates a number of significant related parameters, such as the speed of the ship model, the various wave incidence angles, the wave height, and the navigation time. A chart is also used to show the flow field, and changes in the six degrees of freedom motion and continually compare changes in the drag force.

SPICE MODEL FOR COMPUTER-AIDED DESIGN OF BIOPOTENTIAL AMPLIFIER

2004 ◽  
Vol 16 (03) ◽  
pp. 151-156 ◽  
Author(s):  
YUN-LI LIU ◽  
DONG-LONG LIN ◽  
YUE-DER LIN
Keyword(s):  
Computer Aided Design ◽  
Electrode Impedance ◽  
External Interference ◽  
Proposed Model ◽  
Computer Aided ◽  
Biopotential Amplifier ◽  
Cad Tool ◽  
Power Line Interference ◽  
Aided Design ◽  
Distinct Features

There are many different kinds of biopotential signal. These signals are tiny in amplitude and the measurement is easily corrupted by external interference. For these reasons, the design of high-quality biopotential amplifier is usually an empirical task. To make the design of biopotential amplifier more efficient, this study proposes a simulation model for bioelectric signal measurement such that the design task can be achieved thoroughly by powerful computer-aided design (CAD) tool. The proposed model has two distinct features, one is the simulated biopotential signal is used for the genesis of biosignal, and the other one is the skin-electrode impedance is replaced by its corresponding equivalent circuit, which is a complex RC network. To verify the feasibility of the proposed model, an ECG amplifier is designed in Spice-related CAD tool and is implemented for ECG recording. From the results, the amplifier characteristics agree well between the simulated and the implemented circuit. Besides, the effect due to the commonly encountered power-line interference during biopotential measurement can be reasonably evaluated in the proposed model.

A Computer-Aided Design Tool in Java for Planar Gripper Design

2004 ◽  
Vol 4 (1) ◽  
pp. 43-48 ◽  
Author(s):  
Mike Tao Zhang ◽  
Ken Goldberg
Keyword(s):  
Computational Efficiency ◽  
Computer Aided Design ◽  
Design Tool ◽  
Java Applet ◽  
Physical Experiments ◽  
Computer Aided ◽  
Cad Tool ◽  
Aluminum Part ◽  
Aided Design ◽  
Final Orientation

We describe an Internet-based CAD tool that automatically designs gripper jaws that will rotate a given rigid convex polygonal part from a selected stable resting orientation to a desired final orientation to facilitate insertion or assembly. In this paper we describe the CAD algorithm, its Java implementation, and improvements that relax input specifications and improve computational efficiency. We illustrate with physical experiments using a machined aluminum part and the resulting gripper as designed by the CAD tool. We also consider cases where a solution may not exist and derive a class of triangular parts that cannot be rotated with the planar grippers. The CAD tool, implemented as a Java applet, is available online at www.ieor.berkeley.edu/∼goldberg/sa-gripper/.

scholarly journals Smooth Operator

2002 ◽  
Vol 124 (07) ◽  
pp. 46-48
Author(s):  
Jean Thilmany
Keyword(s):  
Complex System ◽  
Computer Aided Design ◽  
Longitudinal Axis ◽  
Rotor Blades ◽  
Element Analysis ◽  
Smooth Operator ◽  
Computer Aided ◽  
Engineering Problems ◽  
Aided Design ◽  
Load Conditions

This article reviews finite element analysis (FEA) that helped Boeing to eliminate oiled bearings on its Chinook helicopter. The pitch-hinge assembly on the helicopter permits the blade to rotate on its longitudinal axis and to control thrust, which determines where the helicopter is going. In other words, it dictates the pitch of the rotor blades and is one of the most important hinges on the craft. About 2 years ago, Boeing sought to redesign the pitch-hinge assembly to replace the bearings with a self-lubricated hinge. FEA is the use of a complex system of points, called nodes that form a grid, or mesh, across a computer-aided design model. The mesh contains the material and structural properties that define how the part will react to certain load conditions. In essence, FEA is a numerical method used to solve a variety of engineering problems that involve stress, heat transfer, electromagnetism, and fluid flow.

scholarly journals Logic Simulator:Sequential Logic Minimization

1994 ◽  
pp. 45-59
Author(s):  
Mohamed Othman ◽  
Bambang Sunaryo Suparjo
Keyword(s):  
Computer Aided Design ◽  
State Table ◽  
Logic Minimization ◽  
Computer Aided ◽  
Minimum Solution ◽  
Sequential Logic ◽  
Closure Function ◽  
Cad Tool ◽  
Aided Design

Computer Aided Design (CAD) is a tool that comprises of a program written in Turbo Pascal ver 5.0. This CAD tool is use to minimize the states of synchronous sequential logic automatically. In completely specified case, it will give a minimum solution but in the incomplete case, it does not guarantee to produce a minimum solution. Keywords: state-table, compatible tree, maximal compatible(MC), closure function.

APPréCIE: A Computer Package for the Simulation and Design of Mechanical Grippers

1993 ◽  
Author(s):  
Clément M. Gosselin ◽  
Sylvain Lemieux
Keyword(s):  
Computer Aided Design ◽  
Practical Problem ◽  
Input Output ◽  
Large Database ◽  
Dimensional Changes ◽  
Computer Aided ◽  
Cad Tool ◽  
Aided Design ◽  
Robotic Applications ◽  
Simulation Package

Abstract This paper presents a simulation package developed for the computer-aided design of simple mechanical grippers. The program includes a relatively large database of gripper architectures which can be accessed interactively by the designer. The kinematic analysis of each of the generic architectures has been performed symbolically at the programming stage and explicit expressions of the input-output equations as well as the velocity relationships have been coded. This provides an accurate and fast interactive response. The kinematic dexterity and the gripping index can be plotted and are updated automatically when dimensional changes are made. Finally, a graphic animation of the grippers is available. An example is given here to illustrate the application of the design package to a practical problem. This CAD tool could be of great help in the context of the design of mechanical grippers which is one of the key challenges in advanced robotic applications.

Design for Manufacturing of Sculptured Surfaces: A Computational Platform

2009 ◽  
Vol 9 (2) ◽  
Author(s):  
Ahmad Barari ◽  
Hoda A. ElMaraghy ◽  
Waguih H. ElMaraghy
Keyword(s):  
Computer Aided Design ◽  
Tolerance Allocation ◽  
Design Stage ◽  
Sculptured Surfaces ◽  
Machined Surface ◽  
Minimum Deviation ◽  
Computer Aided ◽  
Design And Manufacturing ◽  
Aided Design ◽  
Deviation Zone

This paper presents a computer aided design for machining (DFMc) platform that enables designers to customize the design for the available machine tools and to estimate the effect of design decisions on the accuracy of the final machined products, particularly those containing sculptured surfaces. The platform contains two modules to model and simulate the actual machined surface and to evaluate the resulting minimum deviation zone compared to the desired geometry. In the first module, based on the configuration of the available machine tool and the limitations imposed by its inherent errors, the machined surface is simulated and presented as a nonuniform rational B-spline (NURBS) surface. In the second module, the minimum deviation zone between the actual and the nominal NURBS surfaces is evaluated when the developed method to do this task efficiently improves the convergence of the resulting optimization process. Utilizing this platform, two different applications are developed; design tolerance allocation based on the minimum deviation zone of the machined surface and adaptation of the nominal design to compensate for the effect of machining errors. Employing these applications during the design stage improves the acceptance rate of the produced parts and reduces the rate of scrap and rework. The DFMc platform and its presented applications can be implemented in any integrated computer aided design/computer aided manufacturing (CAD/CAM) system. The presented methods can be applied to any type of input geometries and are particularly efficient for design and manufacturing of precise components with complex surfaces. Products in this group, such as dies and tools, medical instruments, and biomedical implants, mostly have critical and important functionalities that demand very careful design and manufacturing decisions.

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