Interview Questions.

Question 1. Define Numeraical Control Machine?

Answer :

Numerical control machine cane be defined as a shape of programmable machine wherein the procedure are managed with the aid of a application of numbers, letters, and logos.

Question 2. What Is Nc Part Programming?

Answer :

NC component programming is the step by means of method of with the aid of which the collection of processing steps to be completed on the NC system is managed with the aid of a program of numbers, letters, and symbols.

Industrial Interview Questions
Question three. What Is Apt Language?

Answer :

APT [automated programming language]is a computer program, it mechanically calculates the tool direction, generates program and controls the gadget with the aid of receiving wellknown excessive degree languages.

Question four. Mention Any four Post Processor Statement In Apt?

Answer :

COOLNT END FEDRAT/ 
MACHIN/ 
RAPID

Question 5. What Is Cnc?

Answer :

CNC is device consists of a computer, controller and a NC gadget tool. Computer is used to keep and edit this system. Controller controls the device route based totally at the program.

Machine layout Interview Questions
Question 6. What Is Meant By Machining Centre?

Answer :

The machining centre is CNC device with automated tool changing association that is designed to carry out a verity of machining operations, with big number of slicing tools.

Question 7. What Is Part Program?

Answer :

Part program is a excessive degree language containing the instructions for machining a part to diverse general phrases, codes and symbols.

Autosys Interview Questions
Question eight. What Is Post Processing?

Answer :

Post processing is a pc program that takes a generalized part software output and adopts it to a specific gadget control unit and system tool aggregate. It is the fundamental intelligence required to change this system into laptop language.

Question nine. Write The Order Of Instructions In A Part Program?

Answer :

End of Preparatory characteristic Feed feature Tool characteristic block.

Electrical Machines Interview Questions
Question 10. What Is Manual Part Programming?

Answer :

Manual part programming is a method of writing programs which includes a hard and fast of commands [contains codes, symbols and numbers] to perform the machining of the paintings.

Question eleven. What Is Preparatory Function?

Answer :

It is phrase cope with format represented by the letter G, Followed by way of a numerical code for the operation of the manage unit to teach the machine device.

Question 12. What Is Canned Cycle?

Answer :

Canned cycle simplifies and shortens the programming in such way on every occasion anybody of the operation is required.

Industrial Interview Questions
Question 13. What Are The Major Areas To Be Considered In The Design Of Nc Machine Tools?

Answer :

Machine shape and frame
Location of transducer 
Slideways 
Elements of transmission and positioning of sliders
Spindlesvi.Tool maintaining preparations
Question 14. How The Heat Effect On The Machine Bed, Tool Holder Can Be Taken Care?

Answer :

Providing efficaciously designed moderate steel shape with higherstiffness 
Use of ribs, braces, perspective plates to growth stiffness 
Normal weight distribution over the complete frame 
The hollow pass segment for beds, bases and columns with some of ribs welded with the walls cater for the tension as well as starting for inspection, lubrication and collection of chip coolants. 
Thermo symmetrical layout of all elements. 
Providing massive warmth casting off surfaces vii.Use of incredible coolants 
Avoiding direct in addition to nearby sources of warmth consisting of daylight and electric automobiles.Oil pumps respectively. 
Reduction of ambient temperature by means of using aircon gadgets 
Proper alignment of the device factors relative to every other while in operation as well as in desk bound conditions
Question 15. Explain Slide And Slideways?

Answer :

In widespread gadget tools are furnished with tables, slides, carriages etc., to carry the paintings portions or cutting gear and many others., These elements are sliding in nature and mounted on the methods which might be fixed on the opposite components (column, housing, bed or knee) of the machines known as sliding ways.

Question 16. What Kind Of Pc Is The Minimum Hardware Requirement For Operate This Cnc-program?

Answer :

Use a PC 486 DX with 33 Mhz or higher. It calls for a DOS Operation System mounted, e.G. MS-DOS 6.22. MS-Windows three.1/ninety five/ninety eight additionally consists of an usefull DOS-Mode. 

The movement pace manage works with program-loops, depending on the PC's overall performance. 
There are extra than 4 Billion gears (velocity-discounts) to be had. 
Pre-modify the PC's groundspeed within the document "paramet", that's brought with the bundle. 
For 6D programs we recomment use a Pentium PC or equals with min. 166Mhz.
Question 17. Which Steppermotor-driverboards Are Compatible To This Cnc-application?

Answer :

Those with 5V CMOS/TTL logic and 2 Bit (path and clock/allow) wellknown signals.

Question 18. How Does It Work About The Reference- And End-switches?

Answer :

Pin11(reference-transfer) must be on signal-floor whilst this system begins and ends. 
Pin10(quit-switch) is usually closed to GND. If open, it may cause a reference pressure. 
When reference(Pin11) is open and cease-transfer(Pin10) opens also, then pressure back to orgin! 
This saves time in case of interruption of processing. Pin10 is likewise top for overload use. 
All nine axis will be driven lower back to orgin, one after the opposite. Order: W-V-U T-S-R Z-Y-X.
Machine design Interview Questions
Question 19. How Is The Order Of Signals Sending Out To The Printerports?

Answer :

First the direction sign send out, e.G. If X-forward and spindle enabled [binary 64]. 
At 2nd the direction sign inclusive the clock sign ship out [binary 65]. 
A step is executing with pos. Edge of clock! Code in C: outp(0x378,sixty four); outp(0x378,sixty five); 
The databits 1,3,five are the course bits. If ahead set on [0], if backwards set on [1]. 
The signal of cutting-edge increase must be connected to the clock sign in parallel. 
Make positive that the number one modern (30% to 70% of increase) is enabled at the motive force-unit to maintain the motor in steady position at the same time as do not have motions.
Question 20. How Do I Have To Connect The Step-encoders And How Does It Work?

Answer :

When the program starts Pin 10,eleven,12,thirteen,15 must be on floor (Low)! 
Pin 12(X),thirteen(Y),15(Z) might be checked every 4th fullstep whether or not they may be on GND (Low). 
Otherwise it have to exist a High-Level. 
If the Low-Level might not be reached at 4th fullstep (because of overload), then the program try to push more steps (microsteps) at the printerport till the Low-Level may be reached. 
The max. Quantity of failed microsteps until computerized program stop and beginning of vehicle-reference-force can be adjusted inside the record "paramet". 
An immediate reference-pressure also can be caused if any secret is hit at the keyboard. 
You may additionally design your step-encoders via your self with a disk and photogap. 
The function of the photogap need to be adjusted exactly that it does pass the modern if the fullstep is reached. Then it pulls down the High-Level to Low-Level. 
If the layout is an open layout, please shield from sunlight hours or other light on photogap.
Question 21. Some Producers Of Steppermotor-driverunits Offer A "parallel-interface". Do I Need It?

Answer :

Not required! 

If you want to drive greater than three axis, then you need to set up a 2. Or 3. Port to your PC. 
The order of parallel ports are: 378h 278h 3BCh (unique necessities on request).
Question 22. If Switch S1 (bit7 = Milling Spindle On) Is Enabled, Why Does Bit8 Pulsing While Motions?

Answer :

Bit8 places an impuls out, relying on length of movement (adjustable), whilst s1 is enabled. 
Good for power an electromechanic coolingpump, running with diaphragm or piston. 
With s2 (Bit8) you can put an extraimpuls on coolingpump, e.G. Short before drilling a hollow.
Question 23. Is It Possible Milling From Cad Data And Drawings?

Answer :

Yes! With the Fullversion we supply a tool for DXF- and HPGL-Import. 

You may additionally use the integrated Teach-In feature for draw figures and then plot along with your machine. It is generated a programcode within the record "teachdat". 

Call of Teach-In: "cnc educate a hundred bs" The "100" way 100 percentage screenscale! 

With this feature it's miles viable to scale the screen. So you can placed a foil on the display and then use the mousepointer to move along the figures. 
Call "cnc teachdat 0" in DOS Mode and your device will mill the figure in 1:1 or different scale! 
The "0" is the discount of velocity, manner fastest equipment (most slowly == "four.000.000.000").
Question 24. How Do I Realise Effective Programming, Axis-transportation And Serial Works?

Answer :

Choose a cutter with suitable diameter on your maximum common works, e.G. Dia 4mm. 
Do coding simplest for this particular device-diameter. Use the incorporated cycles! 
The utility of the cycles avoids frequently device adjustments and cutter radius compensation. 
Axis-Transportation with self-coded supporting applications will shipping the Start/Endposition. 
Serial works with batch strategies (*.Bat) is possible!
Autosys Interview Questions
Question 25. Why The Z-axis Is Counting Positive When It Comes Down? (different To Din-iso Standard).

Answer :

A logical improvement! You shop time no longer always type the "minus" in the front of the determine. 
The fundamental scale system is absolute, manner that the scale is measuring from a 0-role. 
All measurements of the triangle-, rectangular- and sparkerosion-cycles are absolutely increment. 
From the circle-cycle simply the Radius is increment, the opposite information is measured absolute. 
The startposition of a cycle is the actual role (automatic zero-factor repayment). 
After finish a cycle the automated 0-point compensation is reset to the vintage role.
Question 26. Do The Axis Need All The Same Mechanic Gear And Spindle Slopes?

Answer :

Each axis can have a different tools and spindle slope. 

Question 27. How Driving To More Precise Positions Than The Standard zero.1mm Raster?

Answer :

Full values inside the CNC-code are 1/10mm-Motions. This makes coding brief and easy. 

Decimal values, e.G. G 50.12 22.Four 11.7 are in real X=five.012mm Y=2.24mm Z=1.17mm.

Electrical Machines Interview Questions