The assembling of machine tool’s change gear quadrants based on modernized sets of gears

2020 ◽  
pp. 309-312
Author(s):  
A.P. Fot
Keyword(s):  
Computer Modeling ◽  
Analytical Methods ◽  
Machine Tools ◽  
Software Tool ◽  
Design Constraints ◽  
Center Distance ◽  
Variable Center

A method of assembling the twin-paired change gear quadrant with variable center distance that used on different metalworking machine tools is proposed. The possibility to increase the quality and reducing time of gears adjustment is proved — increase number of gear ratios provided by the modernized set of change gears while the number of change gears in set remains constant. Sets are created based on software tool executing the adjustment of twin-paired change gear quadrants regarding the primary kinematic and design constraints of a machine. The analytical methods and methods of computer modeling are used.

Variable center to center distance of nucleosomes in chromatin

1982 ◽  
Vol 154 (3) ◽  
pp. 515-523 ◽  
Author(s):  
Ariel Prunell ◽  
Roger D. Kornberg
Keyword(s):  
Center Distance ◽  
Variable Center

scholarly journals Synthesis of a ten-link tooth-lever differential roller transmission mechanism

2021 ◽  
Vol 304 ◽  
pp. 02010
Author(s):  
Abdusalam Abdukarimov ◽  
Sanjarbek Madaminov ◽  
Asrorbek Abdullajonov
Keyword(s):  
Scientific Research ◽  
Transmission Mechanism ◽  
Dynamic Synthesis ◽  
Transmission Mechanisms ◽  
Analytical Review ◽  
Line Passing ◽  
Roller Machine ◽  
Differential Transmission ◽  
Center Distance ◽  
Variable Center

This article deals with the synthesis of a ten-link tooth-lever differential transmission mechanism. The article contains an analytical review of modern scientific research on the synthesis of tooth-lever differential transmission mechanisms of roller machines with a variable center distance of the working shafts; a method for the synthesis of toothlever differential transmission mechanisms of roller machines with a variable center distance of the working shafts described on the example of a ten-link tooth-lever differential transmission mechanism; the conditions for the synthesis of the mechanism given and substantiated when this mechanism is used in a roller machine; one of its working shafts has the ability to rotate about its own axis, and the second working shaft, in addition to rotation about its own axis, has the ability to move relative to the first working shaft along a line passing through the center the axes of rotation of both working shafts; the geometric synthesis of the tooth and lever contours of the mechanism, the dynamic synthesis of the mechanism, taking into account the angles of pressure between the lever link of the lever contour of the mechanism, which allows us to determine the optimal working position of the mechanism where the angles of pressure are within acceptable limits; the graphs of changes in the angles of pressure between the links of the lever contour of the mechanism, plotted depending on its position.

Deviplan: A Bid Preparation System for Mechanical SMEs

2000 ◽  
Author(s):  
Dimitris Kiritsis ◽  
Paul Xirouchakis
Keyword(s):  
Petri Net ◽  
Cost Estimation ◽  
Machine Tools ◽  
Software Tool ◽  
Machining Parameters ◽  
Machining Time ◽  
Process Plan ◽  
Machined Parts ◽  
Product Description ◽  
Bid Preparation

Abstract The problem under consideration is the cost estimation and consequent bid preparation for machined parts subcontracted to mechanical small and medium enterprises (SME). This activity, i.e. cost estimation and corresponding bid preparation, becomes more and more important due to the increasing and globalized competition in this market. There is, therefore, a clear need for precise and accurate cost estimation of machined parts in order for a small company to justify its prices. The proposed prototype software system is based (i) on a manufacturing feature based product description of the part to be machined and (ii) on a non-linear model of its process plan using Petri nets, taking into consideration processing alternatives and precedence constraints, which allows a heuristic based best search of the process plan and, consequently, the corresponding machining time and cost. Product description is done interactively through user friendly interfaces and the corresponding process planning model is constructed automatically in the form of a Petri net. Machine tools and their characteristics are selected from a customized database. Tools and machining parameters are selected through a link with the tool management software TOOL Light©. Minimum time or cost process plans and corresponding bids are reported using the Petri net model of the machined part under consideration and using machining heuristics. The type of parts that are considered in our application are rotational or prismatic parts that are used as components in complex machines like machine tools or automatic assembly machines.

Application of a Feedforward Neural Network to Predicting the Thermal Characteristics of Machine Tools

2021 ◽  
Vol 27 (4) ◽  
pp. 202-211
Author(s):  
A. N. Polyakov ◽  
◽  
V. V. Pozevalkin ◽  
Keyword(s):  
Neural Network ◽  
Mathematical Model ◽  
Artificial Neural Network ◽  
Machine Tools ◽  
Thermal Characteristics ◽  
Software Tool ◽  
Neural Network Modeling ◽  
Machine Experiment ◽  
The Neural Network ◽  
Artificial Neural

he paper presents a procedure for studying the stability of modeling an artificial neural network as applied to the thermal characteristics of machine tools. The topicality of this procedure is dictated by the ambiguity of the results generated by the neural network when constructing the predicted thermal characteristics of machine tools. Therefore, to select one of the possible solutions generated by the neural network, it was proposed to use two criteria. The effectiveness of their use is confirmed by the presented machine experiments. The methodology proposed in this work has made it possible to form a generalized concept for studying the effectiveness of the use of neural network technologies in thermal modeling of machine tools. This concept defines a typical set of variable modeling parameters, a basic mathematical model based on a modal approach, and an architecture of a typical software tool that can be developed to study the effectiveness of artificial neural network modeling. For each variant of the input data of the network, the following parameters were varied: the number of neurons in the hidden layer; the size of the input and output vectors; input vectors error; the size of the training, validation and test sample; functional features of thermal characteristics supplied to the network input or their multimodality; the presence and absence of normalization of the input vector. The paper presents experimental thermal characteristics for two spindle speeds of a vertical CNC machine. The results of the machine experiment are presented for six variants of the variable parameters of the mathematical model. The software tool used to carry out the machine experiment was developed in Matlab.

The Management of Evolving Engineering Design Constraints

2011 ◽  
pp. 62-114
Author(s):  
T. W. Carnduff ◽  
J. S. Goonetillake
Keyword(s):  
User Interface ◽  
Engineering Design ◽  
Configuration Management ◽  
Software Tool ◽  
Management Model ◽  
Design Constraints ◽  
Constraint Management ◽  
Intuitive User Interface ◽  
Management Approaches ◽  
Bicycle Design

This chapter presents research aimed at determining the requirements of a database software tool that supports integrity validation of versioned-design artefacts through effective management of evolving constraints. It has resulted in the design and development of a constraint management model, which allows constraint evolution through representing constraints within versioned objects called Constraint Versions Objects (CVOs). This model operates around a version model that uses a well-defined configuration management strategy to manage the versions of complex artefacts. Internal and inter-dependency constraints are modelled in CVOs. The combination of our versioning, configuration management, and constraint management approaches has produced a unique model which has been implemented in a prototype database tool with an intuitive user interface. The user interface allows designers to manage design constraints without the need to program. The innovative concepts developed in this chapter are introduced using an ongoing example of a simple bicycle design.

The Chatterbox: A Device for Hearing Chatter as Sections are Cut

1973 ◽  
Vol 31 ◽  
pp. 360-361
Author(s):  
C. W. McCutchen ◽  
Lois W. Tice
Keyword(s):  
Machine Tools ◽  
Cutting Tool ◽  
Guerilla Warfare ◽  
History Of ◽  
Chatter Marks

Ultramicrotomists live in a state of guerilla warfare with chatter. This situation is likely to be permanent. We can infer this from the history of machine tools. If set the wrong way for the particular combination of cutting tool and material, most if not all machine tools will chatter.In more than 100 years since machine tools became common, no one has evolved a practical recipe that guarantees avoiding chatter. Rather than follow some single very conservative rule to avoid chatter in all cases, machinists detect it when it happens, and change conditions until it stops. This is possible because they have no trouble telling when their cutting tool is chattering. They can see chatter marks, and they can also hear a sometimes deafening noise.

Stereo modeling of HVEM specimens by serial tilting and computer graphics

1986 ◽  
Vol 44 ◽  
pp. 34-35
Author(s):  
J.R. McIntosh ◽  
D.L. Stemple ◽  
William Bishop ◽  
G.W. Hannaway
Keyword(s):  
Computer Graphics ◽  
Analytical Methods ◽  
Photographic Film ◽  
Complex Structures ◽  
Multiple Objects ◽  
Multiple Images ◽  
3 Dimensional

EM specimens often contain 3-dimensional information that is lost during micrography on a single photographic film. Two images of one specimen at appropriate orientations give a stereo view, but complex structures composed of multiple objects of graded density that superimpose in each projection are often difficult to decipher in stereo. Several analytical methods for 3-D reconstruction from multiple images of a serially tilted specimen are available, but they are all time-consuming and computationally intense.

Sign in / Sign up

Export Citation Format

Share Document