Differentiate between conventional machines and CNC machine.

Differentiate between conventional machines and CNC machine.
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State four advantages of CNC machines over conventional machines.

Description : State four advantages of CNC machines over conventional machines.

Last Answer : Advantages of CNC machines over conventional machines: 1) Greater machine utilization. 2) Complex machining operations can be easily done. 3) It gives high degree of accuracy. 4) It requires less ... is reduced. 15) Elimination of special jigs and fixtures. 16) Accurate costing & scheduling. 

Differentiate between CNC and DNC machines.

Description : Differentiate between CNC and DNC machines.

Last Answer : Differentiate between CNC and DNC machines: S. N. CNC DNC 1 In CNC, Far off controlling of operation is not possible DNC facilitates far-flung control  2 ... DNC now not only controls the equipment; however, also serves as a part of administration statistics system.

What are the application of CNC machines?.

Description : What are the application of CNC machines?.

Last Answer : Drill press Milling and turning centres Boring machines Surface grinders Manufacturing industries etc.

What are the factors considered while selecting the components for machining on CNC machines?

Description : What are the factors considered while selecting the components for machining on CNC machines?

Last Answer : Following are the factors to be considered in selecting components of CNC machines? 1. High precision and repeatability. 2. Reliability. 3. Efficiency -To meet the requirement of high precision. ... should be such that removal of swarf is easy and the chips do not fall on the slideways.

State salient features of CNC machines.

Description : State salient features of CNC machines.

Last Answer : Salient Features of CNC machines .. 1. A part program can be fed to the controller unit through a keyboard. 2. The part program once entered can be used again and again. That is why ... control unit allows compensation for any changes in the dimensions of cutting tools caused due wear or otherwise. 

Explain following constructional details of CNC machines with neat sketches. (i) Hydrostatic slideways (ii) Recirculating ball screw and nut

Description : Explain following constructional details of CNC machines with neat sketches. (i) Hydrostatic slideways (ii) Recirculating ball screw and nut

Last Answer : (i) Hydrostatic slideways: In hydrostatic slideways, air or oil is pumped into small pockets or cavities into the carrieage or slides which are in contact with the slide ways. The pressure of ... nut strokes on the screw shaft, the balls repeat the same recirculation inside the return tube. 

With neat sketch explain the working principle of CNC machines.

Description : With neat sketch explain the working principle of CNC machines. 

Last Answer : Working Principle of CNC machine:- A CNC machine also has a tape reader or any other input media for entry of the part program. CNC uses the part program in a different manner though there is ... to the reference. These two signals are compared and necessary action is controlled.   Or  

Give the classifications of CNC machines according to number of axes.

Description : Give the classifications of CNC machines according to number of axes. 

Last Answer : Answer: Classification of CNC machines according to number of axes 1. 2 axes CNC Machine 2. 3 axes CNC Machine 3. 4 axes CNC Machine 4. 5axes CNC Machine

Draw and explain axis configuration as per ISO, for horizontal spindle CNC machines.

Description : Draw and explain axis configuration as per ISO, for horizontal spindle CNC machines.

Last Answer : Axis Configuration for Horizontal Spindle CNC Machines: The first axis to be identified is the Z axis. This is then followed by the X and Y axes respectively. Z Axis and ... are in the directions which advance right-hand screws in the positive X, Y and Z directions respectively.  

Explain any four reference position used on CNC machines.

Description : Explain any four reference position used on CNC machines. 

Last Answer : Reference positions used on CNC machine:   There are three reference positions on CNC machine: 1. Machine zero point 2. Work zero point 3. Tool home position 4.Reference point 1. ... by limit switches. The slide positions are reported to the control by the slides approaching.

Classify CNC machines.

Description : Classify CNC machines.

Last Answer : Classification of CNC machines. A. According to control loop feedback system: 1) Open - loop system 2) Closed - loop system B. According to type of tool motion control system: 1) Finite ... D. According to type of controller: 1) NC based controller system 2) CNC based controller system

Explain working principle of CNC Machine.

Description : Explain working principle of CNC Machine.

Last Answer : Working principle of CNC Machine: In CNC machine, tape reader or any other input media is used for entry of part program. In CNC, entire program is first feed to the inbuilt computer memory. Once the ... . the part programmes can be stored in the memory of the computer and used in future.  

State machine reference point for CNC.

Description : State machine reference point for CNC. 

Last Answer : The machine reference point – R The position of the reference point R is determined by the manufacturer. The value of machine reference co-ordinates XMR and ZMR are fixed and cannot be changed by the user. The machine reference point serves for the calibration of the measuring system.

Define NC and CNC machine.

Description : Define NC and CNC machine.

Last Answer : NC Machine: A system in which actions are controlled by direct insertions of numerical data at some point. or In simple words, Numerical Control Machines means machine controlled by number ... numerical control in which a dedicated computer is used to perform all the basic NC functions.

“CNC machine is having higher productivity than general lathe machine” Justify the statement.

Description : “CNC machine is having higher productivity than general lathe machine” Justify the statement.

Last Answer : CNC machining and conventional machining aim to achieve the same end, and both start with a raw chunk of metal or plastic and shape it into a part. CNC machine is having higher productivity than ... to cut the part, while the conventional machine would require five tools and no doubt more time.

Explain axes identification of CNC machine with neat sketch

Description : Explain axes identification of CNC machine with neat sketch

Last Answer : The first axis to be identified is the Z axis. This is then followed by the X and Y axes respectively. Z axis and motion: Location: The Z axis motion is either along the spindle axis or ... which advance right-hand screws in the positive X, Y and Z directions respectively. 

State function of ATC in CNC machine.

Description : State function of ATC in CNC machine.

Last Answer : An Automatic tool changer or ATC is used in computerized numerical control (CNC) machine tools to improve the production and tool carrying capacity of the machine. ATC changes the tool very quickly, reducing the non-productive time.

State the various advantages and limitations of CNC machine.

Description : State the various advantages and limitations of CNC machine. 

Last Answer : Advantages of CNC Machines:-  [1] Greater machine utilization. [2] Complex machining operations can be easily done. [3] It gives high degree of accuracy. [4] It requires less inspection. [5] ... tooling cost. 6) Temperature, humidity & dust must be affect machining. 7) Initial cost is high. 

Name four component of CNC machine and write their functions.

Description : Name four component of CNC machine and write their functions.

Last Answer : Components of CNC machines The various components of CNC system are :- 1) Program Input Device:- It is the medium of transmitting the part program to the computer. Three commonly used program input ... to facilitate a two way communication between the user, CNC system and the machine tool.

State the function of G00, G94, M08 and M30 used in CNC part programming.

Description : State the function of G00, G94, M08 and M30 used in CNC part programming. 

Last Answer : 1) G00 :- Rapid Traverse Function G00 is the basic G-code for CNC programming to initiate rapid motion mode i.e used for quickly positioning the tool. G00 can be used where the tool is not ... production. As soon as the program ends he can place the next component and start the next cycle. 

State advantages of CNC over NC.

Description : State advantages of CNC over NC.

Last Answer : Advantages of CNC over NC 1. Complex machining operations can be easily done. 2. It requires less inspection. 3. It reduces scrap & waste. 4. It gives high production rate. 5. ... is available in CNC lathe which gives idea about job. This feature is not available in conventional machine 

Write CNC program format with meaning of each term.

Description : Write CNC program format with meaning of each term.

Last Answer : N001 G01 X12345 Y06789 M03 EOB 1. N001 represents the sequence number of the operation. 2. G01 represents linear interpolation 3. X12345 will move the table 1.2345 in. in a positive direction along the X axis. ... in. along the Y axis. 5. M03 Spindle on CW. 6. EOB End of Block

With the help of block diagram explain closed loop control CNC system.

Description : With the help of block diagram explain closed loop control CNC system. 

Last Answer : Special motors called servos are used for executing machine movements in closed loop system. The name indicates that the closed loop control system has a loop that is closed as shown in fig. ... to the drive unit and the cycle repeats until there is no error signal from the comparator.

Describe procedural steps for developing CNC part programme.

Description : Describe procedural steps for developing CNC part programme. 

Last Answer : Procedure for developing part program There are two methods of part programming: manual part program and computer assisted part programming. Manual part programming: 1. To prepare a part program using the ... . 5. The NC system machines (makes) the part according to the instructions on tape. 

Name the various tools used in CNC turning centre. Explain any one in detail.

Description : Name the various tools used in CNC turning centre. Explain any one in detail.

Last Answer : Tools used on Turning Centre: 1. External Turning Tools: 2. Boring Bars:   3. Drills:   4. Threading Tools:   5. Parting Tools:   A. On the Basis of Cutting Tool Construction: ( ... (HCS). (c) Cast alloy. (d) Cemented carbide. (e) Ceramics. (f) Boron Nitride. (g) Diamond. 

Differentiate between lapping and honing process.

Description : Differentiate between lapping and honing process.

Last Answer : S. N. Lapping Honing 1 Lapping is a finishing process in which tool used is called lap. Honing is a finishing process in which tool used is called ... level. Used to improve certain form characteristics such as cylindricity, surface finish, or sphericity.

Differentiate with acid cleaning and alkaline cleaning process.

Description : Differentiate with acid cleaning and alkaline cleaning process. 

Last Answer : Acid Cleaning Process Alkaline Cleaning Process 1 Acid cleaning is used for removal of light rust, tarnish, scale, drawing compounds, oil, and grease It is used for the ... .  caustic soda, tri-sodium phosphate, silicates, borates, or carbonates are the alkaline agents.

Differentiate between TIG and MIG.

Description : Differentiate between TIG and MIG.

Last Answer : Sr. No TIG MIG 1 In Tungsten Inert Gas arc welding, non- consumable tungsten electrode is used  In Metal Inert Gas arc welding, consumable metallic electrode is used 2 ... penetration is obtained 8 Requires skilled operator Less skilled operator can do the job

Differentiate between Lapping and Buffing process.

Description : Differentiate between Lapping and Buffing process. 

Last Answer : difference between Lappin and Buffing process : Sr. No.  Lapping Buffing 1 Lapping is a finishing process in which tool used is called as lap.   Buffing ... , sporting items, tools, store fixtures, commercial and residential hardware and household utensils and appliances.  

Differentiate between open die forging and close die forging.

Description : Differentiate between open die forging and close die forging.

Last Answer : Difference between open die and close die forging:

List the components of NC machines.

Description : List the components of NC machines.

Last Answer : Components of NC Machines: 1. Program input device  2. Memory storage 3. Microprocessor 4. Machine control Unit (MCU) 5. Drive system 6. Machine Tool 7. Feedback system 8. Programmable logic controller (PLC) 9. Machine control panel 10. Operator control panel 11. Tape Reader

Describe briefly, hand forging and machine forging.

Description : Describe briefly, hand forging and machine forging. 

Last Answer : Hand Forging: [1] Hand forging is the oldest type of metal working process and has influenced the formation of other materials through the age. [2] Smith forging was formerly the process ... the height from which they fall, the higher will be intensity of blow the hammer will provide.

Differentiate between product layout and process layout on the basis of 1) Initial investment cost. 2) Cycle Time. 3) Types of machines used. 4) Skill of labour required. 5) Inventory level. 6) Arrangement of machine.

Description : Differentiate between product layout and process layout on the basis of 1) Initial investment cost. 2) Cycle Time. 3) Types of machines used. 4) Skill of labour required. 5) Inventory level. 6) Arrangement of machine. 

Last Answer : Parameter Product layout Process layout 1) Initial investment cost. It requires higher initial investment. Less initial investment 2) Cycle Time. Less cycle time for ... similar operation are grouped together to make a section, like lathe section, milling section etc.

Can I use Arduino for CNC machines?

Description : Can I use Arduino for CNC machines?

Last Answer : Yes, Arduino can be used for CNC machines by controlling the movement and operation of the machine's components, allowing for precise control and operation of the machine.

Which of the following is not the advantage of CNC machines? a.Higher flexibility b.Improved quality c.Reduced scrap rate d.Improved strength of the components

Description : Which of the following is not the advantage of CNC machines? a.Higher flexibility b.Improved quality c.Reduced scrap rate d.Improved strength of the components

Last Answer : d.Improved strength of the components

Write only classification of CNC machines.

Description : Write only classification of CNC machines.

Last Answer : Classification of CNC machines. A. According to control loop feedback system: 1) Open - loop system 2) Closed - loop system B. According to type of tool motion control system: 1) Finite positioning ... 2) Combination lathe / 3-in-1 machine 3) Mini-lathe and micro-lathe 4) Wheel lathe

Sketch and describe the following press operations: 1. Punching 2. Shearing and 3. Trimming

Description : Sketch and describe the following press operations: 1. Punching 2. Shearing and 3. Trimming

Last Answer : (i) Punching : In punching operation, a hole is the desired result. The size of hole is determined by the size of punch and clearance is allowed on the die. The figure shows the ... still hot for maximum efficiency; therefore it is usually incorporated into the larger production process.

Describe with sketch the surface treatment process used to built-up worn out metal components of automotive engines.

Description : Describe with sketch the surface treatment process used to built-up worn out metal components of automotive engines.

Last Answer : Metal spraying is to build-up worn out metal components of automotive engines.   Metal Spraying of metalizing literally means to treat with or coat with a metal or metallic compound. Metalizing as ... being coated, by compressed air. A sectional view of metal spraying gun is shown in fig.  

Explain the shielded metal arc welding (SMAW) processes with neat sketch. State its two advantages and disadvantages.

Description : Explain the shielded metal arc welding (SMAW) processes with neat sketch. State its two advantages and disadvantages.

Last Answer : Working  : Shielded metal arc welding uses a metallic consumable electrode of a proper composition for generating arc between itself and the parent work piece. The molten electrode metal fills the weld ... . 2. Weld may contain slag inclusions 3. Fumes make difficult the process control.

Explain with sketch construction and application of progressive die.

Description : Explain with sketch construction and application of progressive die.

Last Answer : OR Construction A progressive die consists of the following parts.: 1. Stop 2. Sheet metal 3. Pilot 4. Blanking punch 5. Ram 6. Piercing punch 7. Stripper Plate 8. Die ... such as automotive, electronics and appliances. Example car brake caliper, washer, lid of a beverage can etc.

Explain the resistance spot welding process with neat sketch. State its two advantage and disadvantage.

Description : Explain the resistance spot welding process with neat sketch. State its two advantage and disadvantage. 

Last Answer : Resistance Spot welding: Spot welding is employed to join overlapping strips, sheets or plates of metal at small areas .The pieces are assembled between two electrodes, which must possess high electrical & thermal ... for making the RSW a success. 4. The thick jobs are not easy to weld. 

Draw neat labeled sketch of ply press.

Description : Draw neat labeled sketch of ply press.

Last Answer : sketch of ply press

Draw flatter and Fuller. State its use in forging.

Description : Draw flatter and Fuller. State its use in forging.

Last Answer : 1. Fuller: Use of Fuller: Fuller is a forging tool, used to spread the metal. The fuller is placed against the metal stock, and then either the fuller or the stock is struck ... are used to give smoothness and accuracy to articles which have already been shaped by fullers and swages. 

Explain seam welding process with the help of neat sketch.

Description : Explain seam welding process with the help of neat sketch.

Last Answer : Seam Welding is a Resistance Welding (RW) process used for producing continuous joint of overlapping sheets by passing them between two rotating electrode wheels. Heat generated by the electric current flowing through ... the electrodes and cool the work rapidly to speed up the operation.    

List the materials used in press work for automobile components parts with example.

Description : List the materials used in press work for automobile components parts with example.

Last Answer : Materials used in press work: 1) Aluminium, 2) Copper, 3) Brass, 4) Mild Steel, 5) Galvanized iron (G.I) sheets, 6) Duralumin, 7) Y-alloys, 8) Naval Brass, 9) Cartridge Brass, ... 8) Carburettor bodies 9) Valves 10) Combustion Chamber 11) Cylinder heads , blocks,  12) Gear box cases

Explain the following press operations (a) Punching (b) Drawing

Description : Explain the following press operations (a) Punching (b) Drawing

Last Answer : a) Punching: In punching operation, a hole is the desired result. The size of hole is determined by the size of punch and clearance is allowed on the die. The figure shows the spacing of hole on plate2 ... between punch and die is greater. [5] The drawing operation is illustrated in Fig.  

Explain drop forging with neat sketch.

Description : Explain drop forging with neat sketch. 

Last Answer : Drop Forging Process: Drop forging is carried out by using drop hammers. They are board or gravity hammer, air lift hammer and power drop hammer. Anvil of drop forging hammer is attached to the frame ... [5] This energy will be delivered to the metal work-piece to produce plastic deformation.  

State the meaning of G90, G91.

Description : State the meaning of G90, G91.

Last Answer : Meaning of following G-Codes: G90 :- Absolute Dimensioning G91:- Incremental Dimensioning

Define Soldering. Give one application of soldering.

Description : Define Soldering. Give one application of soldering. 

Last Answer : Definition of Soldering:- Soldering is a method of uniting two or more piece of metal by means of a fusible alloy or metal, called solder, applied in the molten state. Applications of Soldering ... 9. Refrigeration and plumbing machine tools components,  10. Copper foil in stained glass work. 

Give Classification of Presses.

Description : Give Classification of Presses.

Last Answer : 1. Classification on the basis of source of power. Manual Presses.  Mechanical presses. Hydraulic Presses. Pneumatic Presses. 2. Classification on the basis of number of slides. Single ... - Frame Presses. Gap Frame Presses. Straight Side Presses. Horn Presses. Inclibable Press