1. Numerical control (NC) systems were developed to automate machine tools using programmed sequences of instructions to control machine motions and functions.
2. NC systems use machine control units to read part programs containing coded instructions and translate them into mechanical actions to control machine tools.
3. Modern computer numerical control (CNC) systems provide greater flexibility over early NC systems by using computers to generate part programs and allow real-time adjustments to machine operations.
Advantages & Limitations of CNC machine tools,Introduction DNC,Component of a DNC system,Principle,Functions of DNC
Types of DNC systems,Comparison between NC, CNC and DNC machine tools
Introduction to CNC machine and Hardware. aman1312
Complete detailing of cnc machine and its operations with its required hardware necessary for increasing its Automation and increasing its manufacturing capability. Also increase in complex shape manufacturing.
Advantages & Limitations of CNC machine tools,Introduction DNC,Component of a DNC system,Principle,Functions of DNC
Types of DNC systems,Comparison between NC, CNC and DNC machine tools
Introduction to CNC machine and Hardware. aman1312
Complete detailing of cnc machine and its operations with its required hardware necessary for increasing its Automation and increasing its manufacturing capability. Also increase in complex shape manufacturing.
The adaptive control is basically a feedback system that treats the CNC as an internal unit and in which the machining variables automatically adapt themselves to the actual conditions of the machining process.
The adaptive control is basically a feedback system that treats the CNC as an internal unit and in which the machining variables automatically adapt themselves to the actual conditions of the machining process.
CNC Programming for Begainer.
1.Easy Mehtod.
2.Complete Theoritical Knowledge.
3.Motion and coordinate system for NC machine.
4.Axes convention of VMC & HMC.
5.How to make Part Programming.
6.Coordinates System.
7.Programming Format.
8.List of G Codes And M Codes.
9.How to Use of Above Codes In Programme.
10.Reference Point and Return of Machine.
Numerical Control (NC) machine tools – CNC types, constructional details, special features, machining centre, and part programming fundamentals CNC – manual part programming – micromachining – wafer machining
Modern Machine Tools:
CNC machines: Introduction, principles of operation,
Types – Vertical machining centres and horizontal machining centres,
major elements, functions, applications,
controllers,
open loop and closed loop systems
Types of automatic machines,
Transfer machines
Numerical control (NC) machine tools - CNC: types, constructional details, special features - design considerations of CNC machines for improving machining accuracy -structural members - slide ways - linear bearings - ball screws - spindle drives and feed drives.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
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Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
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Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
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Vaccine management system project report documentation..pdfKamal Acharya
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2. HISTORICAL DEVELOPMENT
• 15th century - machining metal.
• 18th century - industrialization, production-type machine tools.
• 20th century - F.W. Taylor - Tool metal - HSS
Automated production equipment -
Screw machines
Transfer lines
Assembly lines
using cams and preset stops
Programmable automation -
NC
PLC
Robots
3.
4. A Definition of NC
• Numerical Control is a system in which actions are
controlled by the direct insertion of numerical data at
some point.
• In other words, Programmable automation in which the
mechanical actions of a ‘machine tool’ are controlled by a
program
• or
• It is defined Method of programmable automation in which
various functions of machine tools are controlled by numbers
, letters and symbols.
5. In NC machine numbers form of program of instructions are:
1.TO Start (or) Stop the machine tool spindle .
2. To control the spindle speed.
3.To change the tool.
4.To change the feed rate.
5.To switch the coolant on/off.
6.To position the tool at a desired position
Principle of operation:
1.The program of instructions in terms of part geometry ,
cutting process parameters and type of tool serves as the input
of machine control unit (MCU) which in turns commands the
machine tool to make the product.
2.The machine axes are connected to servomotors , which
work under the control of the machine control unit (MCU)
3.The servomotors control the movement of the cutting tool
with respect to work piece.
6.
7. 1.The control of an axis in an NC machine as shown
2. It is a closed loop positioning system
3.The MCU Generates a pulse signal until the signal returned from
the feed back transducer agrees with the original number of
pulses requires to execute the movement.
4.The comparator compares the count of feedback pulses with the
original number, and the error signal is the output until the table
reaches the desired position.
5. Feed back transducers are linear/rotary encoders used to obtain
the correct position or velocity feedback.
9. NUMERICAL CONTROL ELEMENTS
1.Program of instructions.
2.Machine control unit (MCU).
3.NC machine tool.
4.NC Cutting tools.
1.Program of Instructions:
1. The program of instructions is the detailed step - by - step
of operations which are implemented by MCU .
2.The program is coded in alphanumerical form on an input
medium to the MCU
3. The input medium is a punched tape or a magnetic tape .
4.Two method are used to program for NC
I. Manual part programming
II. Computer – aided part programming
10. COMPONENTS OF NC MACHINES
MCU
Machine
Tool
CLU
DPU
MCU - Machine control unit
CLU - Control-loops unit
DPU - Data processing unit
Hardware Configuration of NC
Machine
11. 2. Machine Control Unit (MCU)
• NC machine tool has a main unit, which is known as Machine Control
Unit.
• It consists of some electronic hardware that reads theNC programme,
interprets it and conversely translates it for mechanical actions of the
machine tool.
• MCU consists of two parts : Data processing unit (DPU) and
• control loops unit (CLU).
• Function of DPU: read the decode the instructions available on the
tape & to provide the decoded data to the control loops unit (CLU).
• Function of (CLU): To control the drives attached to the axes and
receive the feedback signals from machine tool
• CLU also prompts a signal that the previous data segment is
completed and that the DPU can read the next block of the part
program.
12. DPU consists of the following elements:
1.Input device example: Tape reader
2.Reading circuit
3.parity checking logic (transmission error).
4.Decoding circuits
5.interpolator
CLU consists of the following:
1. Position control unit with a feedback device such as a linear
encoder.
2. Velocity control unit with a feedback such as a rotary encoder.
3. Acceleration , retardation and backlash correction circuits.
4. Auxiliary function control unit for coolant on and off ,etc.
13. 8
3 .NC Machine Tool :
•Machine tool is the main components of a numerical control
system, which executes the operations.
•It may consist of worktable, cutting tools, jigs and fixtures,
motors for driving spindle and coolant and lubricating
system.
•The latest development in the numerical control machine
tool is the versatile machining center.
•This is a single machine capable of doing a number of
operations such as milling, boring, drilling, reaming, and
tapping by Automatic Tool Changer (ATC) under the control
of tool selection instruction.
14. 4 .NC cutting tools:
1.The ISO Procedure is adopted for the designation of NC cutting tools .
2.A power operated draw bar may be used to pull the tolling at the retention knob.
3.A typical end mill as shown as the programmer obtain the history of the tools such
as tool number , cutter compensation etc.
15. 9
The MCU may be of three types :
•Housed MCU
Machine Control Unit may be mounted on the machine tool or
may be built in the casing of the machine.
•Swing Around MCU
Machine Control Unit is directly mounted on the machine, which
can swing around it and can be adjusted as per requirement of the
operator’s position.
•Stand Alone MCU
Machine Control Unit is enclosed in a separate cabinet which is
installed at some remote or same place near to the machine.
18. NC coordinate system :
1. A Cartesian co-ordinate system consist of three axes
positioned at 900 from each other.
2.the nomenclature of the three main axis (x , y, z) is
based on the right hand rule.
3. (x ,y , z) axes are represented by the thumb , index and
middle fingers of the right hand.
4. the right hand rule is used the positive direction of the
co-ordinate axes.
5.the three rotational axes defined in NC are the a, b, c
axes.
19. For turning operations:
1. Two axes are normally required to control the movement of
the tool relative to the rotating work piece.
2.The z- axis is the axis of rotation of the work piece and the
x- axis radial location of the cutting tool.
For Drilling and milling operations:
1. Two axes x and y are defined in the plane of the table and
the z- axes is perpendicular to the plane and the movement in
the z- direction is controlled by the vertical motion of the
spindle.
20. BASIC REQUIREMENT OF NC MACHINE CONTROL
a. Preparatory functions: which unit, which interpolator,
absolute or incremental programming, which circular
interpolation plane, cutter compensation, etc.
b. Coordinates: three translational, and three rotational axes.
c. Machining parameters: feed, and speed.
d. Tool control: tool diameter, next tool number, tool change.
e. Cycle functions: drill cycle, ream cycle, bore cycle, mill
cycle, clearance plane.
f. Coolant control: coolant on/off, flood, mist.
g. Miscellaneous control: spindle on/off, tape rewind, spindle
rotation direction, pallet change, clamps control, etc.
h. Interpolators: linear, circular interpolation
21. Types of Numerical Control
• Conventional Numerical Control (NC)
• Direct Numerical Control (DNC)
• Computer Numerical Control (CNC)
15
22. Conventional Numerical
Control (NC)
• Data is sent to the machine tool by
means of punch cards or tapes.
• The reader at the machine performs no
calculations or interpolations.
16
23. DNC
• Direct numerical control (DNC) – control of multiple
machine tools by a single (mainframe) computer
through direct connection and in real time
▫ 1960s technology
▫ Two way communication
• Distributed numerical control (DNC) – network
consisting of central computer connected to machine
tool MCUs, which are CNC
▫ Present technology
▫ Two way communication
25. Cost-Benefits of NC
Costs
• High investment cost
• High maintenance effort
• Need for skilled programmers
• High utilization required
Benefits
• Cycle time reduction
• Nonproductive time reduction
• Greater accuracy and repeatability
• Lower scrap rates
• Reduced parts inventory and floor space
• Operator skill-level reduced
26. CLASSIFICATION OF NUMERICAL CONTROL
• Motion control: point to point (PTP)
continuous (contouring) path
• Control loops: open loop and closed loop
• Power drives: hydraulic, electric, pneumatic
• Positioning systems: absolute positioning
incremental positioning
• Hardware and software: Hardware NC
software computer numerical control (CNC)
27. NC tool positioning methods:
1. Absolute positioning fixes the reference system and enables the actual ( x ,
y, z ) coordinates to be specified with respect to a fixed origin.
2. Incremental positioning: It uses incremental movement that the next tool
location is defined with respect to the previous tool location
28. 1.Motion Control
1.PTP motion-control
• The point to point mode is used to move the
cutting tool to a pre-defined position.
• The machine operation is performed at that
position
• Moving at maximum rate from point to point.
• Accuracy of the destination is important but not
the path.
• Drilling is a good application.
Numerical control modes
29.
30. 2.Straight cut NC mode:
1.In this mode the cutting tool is moved parallel to one of
the major axis (x or y or z) at a control rate
2.pocket milling is an example of the straight cut NC
mode.
31. 3. Contouring NC control :
1. In this mode , the tool motion is in more than one axis is
controlled continuously and simultaneously to get desired
shape.
2.This mode perform 2dimension or 3 dimension
profiles to be contour machined used in milling , turning and
grinding machines.
3.In the process of machining, the tool contacts the work
piece.
4.Use linear and circular interpolators
33. Interpolation Methods
1. Linear interpolation
▫ Straight line between two points in space
1. Circular interpolation
▫ Circular arc defined by starting point, end point, center
or radius, and direction
1. Helical interpolation
▫ Circular plus linear motion
1. Parabolic and cubic interpolation
▫ Free form curves using higher order equations
34. • Closed-loop control: to measure displacement of table
motion
• the advantage of a closed-loop system is its positioning
accuracy.
35. Power Drives
• Electric motor
▫ widelyused
▫ small size, ease of control, lowcost
• Hydraulic drive
▫ much larger power/sizeratio
• Pneumatic drive
▫ rarely used in NC positioningsystem
▫ can be used to drive the auxiliarydevices
36. NC MACHINE RATING
• Accuracy
• Repeatability
• Spindle and axis motor horsepower
• Number of controlled axes
• Dimension of workspace
• Features of the machine and the controller.
37. NC APPLICATIONS:
1. Material removal process:
Turning, drilling, boring, milling and grinding
2.welding and cutting processes:
spot welding ,arc ,laser beam and plasma cutting
3.Automatic drafting
4.Assembly of parts
5.Automatic riveting
6.Tube bending
7.cloth cutting
8.automated knitting (craft)
9.plastic moulding process
Injection moulding and Blow moulding
38. Limitations of NC
1.The cost is high.
2.The maintenance cost is high on account of its
complex and sophisticated technology.
3.NC machines require part programmers. There
is problem of finding , hiring and training the
programmers.