A New Method for Modeling of Cutting Tools Associated With Rolling Axodes

1998 ◽  
Author(s):  
Nicolae Oancea ◽  
Victor G. Oancea
Keyword(s):  
Cutting Tools ◽  
New Method ◽  
Contact Points ◽  
Alternative Method ◽  
Solution Of Equations ◽  
Tool Profile ◽  
Family Of Curves ◽  
Envelope Theory

Abstract Most of the existing methods for determining the profiles of cutting tools that work by wrapping are based on the envelope theory which requires cumbersome analytical formulations associated with the solution of equations not always easy to resolve. This work presents a new alternative method for studying conjugated surfaces associated with rolling axodes. The original meshing surfaces are replaced by a family of curves of substitution which gives a simpler interpretation of the envelope theory. The meshing line and the contact points can be easily determined. An equidistant to the tool profile can be simply calculated which can be very useful in the case of machining with cylindrical abrasive disks. Several examples are shown for rack, shaper and rotational cutters.

Geometrical Modeling of Surface Generation Through Wrapping

1997 ◽  
Vol 119 (4B) ◽  
pp. 829-834 ◽  
Author(s):  
N. Oancea ◽  
V. G. Oancea
Keyword(s):  
Inverse Problem ◽  
Numerical Method ◽  
Cutting Tools ◽  
Analytical Form ◽  
New Method ◽  
Surface Generation ◽  
Minimal Distance ◽  
Geometrical Modeling ◽  
Tool Profile ◽  
Envelope Theory

A number of methods exist for determining profiles of cutting tools that work by wrapping. Most of these methods are based on the envelope theory and almost inevitably require cumbersome analytical formulations not always easy to resolve. This work presents a new method for studying conjugated surfaces associated with rolling axodes. Originally devised in an analytical form in a previous work of the first author, a purely numerical method is developed here based on a theorem which we call “the theorem of the minimal distance.” The advantage is twofold: first, geometrical modeling of tool profile calculation is possible even for profiles which cannot be described analytically; second, a very useful tool is provided for the inverse problem—starting from the measured cutting edges profiles, one can calculate the effectively generated surface on the workpiece. Several examples are shown for rack, shaper, and rotational cutters.

A New Method for Cutting Tools Design

2000 ◽  
Author(s):  
Nicolae Oancea ◽  
Victor G. Oancea ◽  
Epureanu Alexandru
Keyword(s):  
Cutting Tools ◽  
New Method ◽  
Discrete Representation ◽  
Alternative Method ◽  
Envelope Theory

Abstract Most of the existing methods for determining the profiles of cutting tools that work by wrapping are based on the envelope theory. This theory requires cumbersome analytical formulations resulting in sets of equations not always easy to solve. This work presents a new alternative method for studying conjugated surfaces associated with rolling axodes by using a discrete representation of the tool. The new method is based on studying the trajectories of points on the tool relative to the workpiece in order to define the tool’s profile. Several examples are shown for rack, shaper and rotational cutters.

Computerized Simulation of Enveloping Process for Different Applications

2000 ◽  
Author(s):  
V. I. Goldfarb ◽  
R. V. Voznyuk
Keyword(s):  
Process Simulation ◽  
Gear Tooth ◽  
Cutting Tools ◽  
General Purpose ◽  
Contact Points ◽  
Tool Profile ◽  
Screw Surface ◽  
Gear Contact ◽  
General Purpose Software

Abstract Application domain of the enveloping method is very wide and includes numerous engineering applications. The method has been widely applied for the formation of various surfaces, including gear flanks. So called ‘nondiffferential’ method for enveloping process simulation has been developed; the method makes possible adequate description of the process. The method had laid the foundation for the development of a general-purpose software package which is used for the simulation of screw surface formation by different types of cutting tools, computation of tool profile needed to machine defined screw surface, determination of the profile of a gear tooth machined by a tool with defined geometry, computation of gear contact points coordinates, and other tasks. The computer program is modular in design, with a number of common units for the description of enveloped link geometry, enveloping process simulation, motion description, and units related to the solution of specific applied tasks.

scholarly journals On Manipulation of Objects in Three-Fingered Grasp

1995 ◽  
Vol 117 (4) ◽  
pp. 561-565 ◽  
Author(s):  
D. P. Chevallier ◽  
S. Payandeh
Keyword(s):  
Reference Frame ◽  
New Method ◽  
Inner Product ◽  
Product Spaces ◽  
End Effector ◽  
Inner Product Spaces ◽  
Contact Points ◽  
Fixed Reference ◽  
Fine Manipulation

Manipulation of the grasped object is defined as the ability of the mechanical end-effector to create an instantaneous motion of the object with respect to a fixed reference frame (e.g., palm reference frame). This class of manipulation is usually referred to as the fine manipulation whereas a collection of all these instantaneous motions of the object is referred to as the gross manipulation. This paper presents a new method where for a given desired twist of the grasped object, the instantaneous motions of the fingertips can be determined. The results of the paper are divided into two parts. First, for the case where the motion of the object is created through motions of the fingertip in off-tangent planes to the object at the contact points. Second, where a class of motion of the grasped object is achieved through motions of the fingertips which are restricted to the tangent planes. The method of this paper utilizes screw geometry, inner product spaces and information regarding grasp configuration. The method is also illustrated through examples.

Computer Program in Visual Basic Language for Manufacture of Helical Cutting Tools

2012 ◽  
Vol 488-489 ◽  
pp. 813-818
Author(s):  
Ngoc Thiem Vu ◽  
Shinn Liang Chang ◽  
Jackson Hu ◽  
Tacker Wang
Keyword(s):  
Computer Program ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Technical Parameters ◽  
Manufacture Process ◽  
Basic Language ◽  
Tool Profile ◽  
Relief Angle ◽  
Economical Consideration ◽  
Visual Basic Language

The helical cutting tools have complex geometries. A rack cutter is the most economical tool that has been used for manufacturing helical cutting tool. In this paper, the computer program has been designed to evaluate the manufacture abilities following design concept and analyze the technical parameters of helical cutting tool. The program can simulate the sections of helical cutting tool and the rack cutter, analyze the clearance angle, relief angle, and width top of the helical cutting tool, and modify the rack cutter profile to show the helical cutting tool profile suitably. This program can predict the differences during manufacture process and give the best solution for economical consideration.

Compared to What? A Comment on “A Robust Transformation Procedure for Interpreting Political Text” by Martin and Vanberg

2007 ◽  
Vol 16 (1) ◽  
pp. 101-111 ◽  
Author(s):  
Kenneth Benoit ◽  
Michael Laver
Keyword(s):  
Research Design ◽  
Critical Analysis ◽  
Statistical Analyses ◽  
New Method ◽  
Policy Positions ◽  
Transformation Procedure ◽  
Alternative Method ◽  
Research Designs ◽  
Original Reference ◽  
Selection Of

In “A Robust Transformation Procedure,” Martin and Vanberg (2007, hereafter MV) propose a new method for rescaling the raw virgin text scores produced by the “Wordscores” procedure of Laver, Benoit, and Garry (2003, hereafter LBG). Their alternative method addresses two deficiencies they argue exist with the transformation of virgin text scores proposed by LBG: First, that the LBG transformation is sensitive to the selection of virgin texts, and second, that it distorts the reference metric by failing to recover the original reference scores when reference texts are scored and transformed as if they were virgin texts. Their proposed alternative is “robust” in the sense that it avoids both shortcomings. Not only is MV's transformation a welcome contribution to the Wordscores project but also the critical analysis on which it is based brings to light a number of assumptions and choices that face the analyst seeking to estimate actors' policy positions using statistical analyses of the texts they generate. When first describing the possibility of rescaling the raw virgin text estimates, we emphasized that ourparticular approach to rescaling is not fundamental to our word-scoring technique but, rather, is a matter of substantive research design unrelated to the validity of the raw virgin text scores… Other transformations are of course possible. (LBG, 316)To explore more fully into the assumptions and choices behind alternative transformations and the research designs which motivate them, we offer the following comments.

A New Method for the Generation of Tool Paths for Finishing Near Net Shape Components

2013 ◽  
Author(s):  
Edgar A. Mendoza López ◽  
Hugo I. Medellín Castillo ◽  
Dirk F. de Lange ◽  
Theo Lim
Keyword(s):  
Geometric Modeling ◽  
Tool Path ◽  
Cutting Tools ◽  
Approximation Error ◽  
Cnc Machining ◽  
New Method ◽  
End Mill ◽  
Tool Paths ◽  
Near Net Shape ◽  
Finish Cut

The CNC machining has been one of the most recurrent processes used for finishing NNS components. This paper presents a new method for the generation of tool paths for machining 3D NNS models. The proposed approach comprises two machining stages: rough cut and finish cut, and three types of cutting tools: ball-end mill, flat-end mill and fillet-end mill. The proposed tool path generation algorithm is based on: (1) approximation of the model surfaces by points using slice planes and visibility analysis, (2) accessibility analysis of the tool, (3) approximation error and tolerance evaluation, (4) collision analysis of tool and tool holder. The tools paths generated are exported as a CNC program. The implementation was carried out in C++ using the ACIS® geometric modeling kernel to support the required geometric operations. To prove the effectiveness of the system several models with variable geometric complexity were tested. The results have shown that the proposed system is effective and therefore can be used to generate the tool paths required for finishing 3D NNS components.

A new method for the detection of microbial proteolytic enzymes in milk

1982 ◽  
Vol 49 (2) ◽  
pp. 209-219 ◽  
Author(s):  
Allan J. Cliffe ◽  
Barry A. Law
Keyword(s):  
Proteolytic Enzymes ◽  
New Method ◽  
Gram Negative Bacteria ◽  
Optimum Conditions ◽  
Sample Processing ◽  
Gram Negative ◽  
Alternative Method ◽  
Simple Alternative ◽  
Extracellular Proteinases

SUMMARYOptimum conditions have been determined for the use of Hide Powder Azure (HPA) to estimate extracellular proteinases produced by psychrotrophic Gram-negative bacteria. This assay is quicker, more precise and 3·2 times more sensitive than assays of soluble N released from casein. It provides a simple alternative method for monitoring proteinase purification schemes. With the modification described it is now possible to determine proteinase activities directly in milk. In its simplest form the HPA assay is sufficiently sensitive to detect proteinases produced by as few as 1·5 x 106 c.f.u. ml-1 psychrobtrophs without the necessity for any sample processing.

Decomposition Strategies for the Synthesis of Single Input-Single Output and Dual Input-Single Output Compliant Mechanisms

2007 ◽  
Author(s):  
Charles Kim
Keyword(s):  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Single Point ◽  
Building Blocks ◽  
New Method ◽  
Single Input Single Output ◽  
Single Output ◽  
Alternative Method ◽  
Decomposition Strategies ◽  
Single Input

In this paper a new method for the synthesis of compliant mechanism topologies is presented which involves the decomposition of motion requirements into more easily solved sub-problems. The decomposition strategies are presented and demonstrated for both single input-single output (SISO) and dual input-single output (DISO) planar compliant mechanisms. The methodology makes use of the single point synthesis (SPS) which effectively generates topologies which satisfy motion requirements at one point by assembling compliant building blocks. The SPS utilizes compliance and stiffness ellipsoids to characterize building blocks and to combine them in an intelligent manner. Both the SISO and DISO problems are decomposed into sub-problems which may be addressed by the SPS. The decomposition strategies are demonstrated with illustrative example problems. This paper presents an alternative method for the synthesis of compliant mechanisms which augments designer insight.

Sign in / Sign up

Export Citation Format

Share Document