2 major cordinate systems in CNC Machining:
1. Absolute - In this system the exact cordinate of required points are fed in the machine.
2. Incremental - In this system the relative cordinate i. e. to previous point is fed in the machine.
The figure shows all 5 axes of CNC Vertical Machining Center. This question is frequently asked in any CNC interview.
CNC Machining involves circular interpolation. These are the 2 commands for that. When rotation required is less than 180 deg. + sign is used. When rotation required is >180 deg. - sign is used.
The picture shows it by an example.
Some important questions for interview in CNC Machining/Production.
https://youtu.be/YalZO1SyzEg
Also Read : CNC Programming
Two Questions regarding quadrilaterals which includes concept of Rhombus and mid-point theorem.
Also read : Pythagoras Theorem with proof
What about those Power Feeds?
There are two approaches. First of all, CNC's have the ability to jog. Jogging is where
you're spinning a simulated electronic handwheel, or holding down a button or joystick
to make the axis move. You generally select an axis, select a speed or multiplier (x1,
x5, x100 or whatever), and then operate the control to move the axis.Here...
Applications/Uses of IC Engines
Road Vehicles (Scooters, Motocycles, Buses)
Aircraft
Locomotives
Pumping Sets
Cinemas
Hospital
Other Industrial Applications
Two Stroke Petrol Engines ;
50cc engines develops max brake power of 15 kw at 5000 rpm and is used in mopeds.
The 100cc engine develops brake power of 3kw at 5000 rpm is used in scooters.
The 250cc develops max power...
Classification of IC Engines :
According to cycle of operation;
Two Stroke cycle engines
Four Stroke Cycle engines
According to cycle of combustion;
Otto Cycle (Combustion at constant volume)
Diesel Cycle (Combustion at constant pressure)
Dual Combustion or SemiDiesel cycle engine (Combustion partly at constant volume and partly at constant pressure)
According to valve arrangement :
Over Head Valve engine
L-Head Type engine
F-Head type engine
T-Head type...
Entropy
Entropy is a function of a quantity of heat which shows the possibility of conversion of that heat into work. The increase in entropy is small when heat is added at a high temperature and is greater when heat is added at a lower temperature. Hence for maximum entropy, there is minimum availability for conversion into work and for...
Q.1) Which among the NC operations given below are continuous path operations?
Arc Welding (AW) Milling (M)
Drilling (D) Punching is Sheet Metal (P)
Laser Cutting of Sheet Metal (LC) Spot Welding (SW)
A) AW, LC and M (b) AW, D, LC and M
(c) D, LC, P and SW (d) D, LC, and SW
Correct Option - A
Q.2) High speed steel tools retain their...
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