1. By
P.Kranthi Kumar
R.Aditya

2. Contents
 Introduction to steam turbine
 Steam Turbine Elements
 Introduction to CNC
 Computer Numerical Control
 Introduction to CNC programming
 CNC Programming

3. Introduction To Steam Turbine
 A Steam turbine can be defined as a form of heat engine in which the energy
of the steam is transformed into kinetic energy by the means of expansion
through nozzles and kinetic energy of the resulting jet is in turn converted
into force during work on rings of blading mounted on a rotating part.

4. Fundamental Parts
of Steam Turbine
FrameNozzleStatorRotor

5. Steam Turbine Elements
 Turbine casing and guide blade carrier:

6.  Inner Casing:

7.  Turbine Rotor and Blading

8. Introduction to CNC Programming
Numerical
control
Type of
machine
Storage
Media
Programmin
g methods
Type of
control
Point –to –Point
NC
Continuous NC
Open Loop
Closed Loop
Incremental
Absolute
Magnetic Disc
Punched Paper
Magnetic Tape

9. Computer Numerical Control
Tape
reader for
initial
program
entry
Minicomputer or
microcomputer
(software functions
and NC part program
storage)
Computer
hardware
interface
and servo
system
Motion
Feedback

10. Introduction To CNC Programming
Part programming
structure
Character
Digit Letter Symbol
Word Block Program

11.  FUNCTIONAL CODES: There are two main codes used
to perform the operation on the machine.
CODES
M-CODESG- CODES

12. CNC PROGRAM
 Main program HP side.
 Subroutine Programs.
1) Diameter Roughing
2) Groove Roughing
3) Calculation Subroutine
4) Groove Width Roughing / Depth Finishing
5) Diameter Finishing
6) Groove Width Finishing / 0.3 Recess
7) Step Diameter Finishing
8) Top Suspension
9) Bottom Suspension
10) Packing Groove
11) Chamfering
 Upper
 Lower
12) Fin Grooves

13. GROOVE DIAGRAM
AF LHT
1X 45
BF BHLN BHMN
LHL
LHM

14. MAIN PROGRAM(I.P SIDE)
G00 G90 X850 D1;
Z = 2;
R10 = 9; (Diameter Roughing)
=10; (Groove Roughing)
=11; (Groove width Roughing/ depth finishing)
=12; (Diameter finishing)
=13; (Groove width Roughing/0.3 recess)
=14; (Step Diameter Finishing)
=15; (Top suspension)
=16; (Bottom suspension)
=17; (Packing Groove)
=18; (Upper chamfering)
=19; (lower chamfering)
= 20; (Fin Grooves)
NO10 (POS 20) R1=1357 R2=1318 R3=143 R4=137.7 R5=18 R6=10
R7=21 R8=14 R9=25.8 R11=25 R12=80.9 R13=17
L=R10;

15. L10 .Groove Roughing (Using grooveing tool)
D15
D25
R1 R20
R4
R22
L9.Diameter Roughing (Using boring tool)
D1
R3 R1
R2

16. L11 Groove Width Roughing / Depth Finishing (Using grooving
tool)
R1 R20
R4
R2
R22
L12 Diameter Finishing (Using grooving tool)
R3 R1
R2

17. L14 Step dia finishing (Using grooving tool)
R24 R1
R3 R23
L13 Top suspension (Using top suspension tool)
D10 D20
R20
R29
r3
R27 R22

18. L17 Packing groove (Using radius tool of 3mm diameter)
D21
R1
R22
R35 R4
R2
L20 Fin grooves (Using a special grooving tool of 1.5 mm width)
D5
R1 R12
R13

19. L100. Calculation
Subroutine
R20 = R4-R5;
R21 = 2*R7;
R22 = R1+6+R21;
R23 = R3-0.3;
R24 = R23-R11;
R25 = R7-R6;
R26 = 2*R25;
R27 = (R9-R5)/2;
R29 = R20-R28;
R30 = R4+R28;
R31 = 2*R8;
R32 = 2*R6;
R33 = R31 + R32 + 6;
R34 = R1 + R33;
R35 = R5/2;

20. THANK YOU