CNC Programming.pptx.pdf

Cnc

1. CNC Programming
Hands on Training on ‘CNC Programming’ Date: 08-07-2017
Presented by
Mohamed Ismail A
Assistant Professor
Mechatronics

2. Alpha Breathing
2
Breath In
Breath Out

3. Learning through evocation
3

4. CNC Programming
4

5. General Objective
5
To Create CNC programming for the part diagram

6. Specific Objectives
6
Students will able to

SO 1: List the types of controllers used in machines .
(E) (R-F).

SO 2: generate the CNC program for the given part
diagram . ( E) (Cr-C).

7. 7
Taxonomy of Objectives
Knowledge Dimension The Cognitive Process Dimension
RememberUnderstand Apply Analyse EvaluateCreate
A. Factual Knowledge
1
B. Conceptual Knowledge
2
C. Procedural Knowledge

D. Meta Cognitive
Knowledge

8. Pre requisite
8
1.Basic workshop Laboratory.
2.Manufacturing technology

9. ❖ Coordinate systems.
❖ Address Characters.
❖ Offsets.
❖ Unit Considerations.
❖ G-codes.
❖ M-codes.
❖ Simple Programming.

Contents

10. Coordinate system
❑ Numbers which indicate the location of a point relative to
a fixed reference point (the origin).

11. Types of Coordinate System
❖Absolute Method

❖Incremental Method

12. Absolute method
Uses X, Y, and sometimes a Z-axis to establish a point
some distance from a common Reference point (origin)

Examples:

10
30
40

13. Incremental method
Point at some distance is established from its Previous
point(origin).
In this case reference point not common.

Example:

10
20
10

14. Two Axes CNC

Z – Horizontal
X - Vertical

15. Point Establishment in Absolute
Method
points axes
Z X
p1 0 0
p2 20 0
p3 20 5
p4 10 5
p5 10 20
p6 0 20
Take p1 as reference point

16. Point Establishment in Incremental
Method
points axes
Z X
p1 0 -20
p2 20 0
p3 0 5
p4 -10 0
p5 0 15
p6 -10 0

17. Point Establishment in Incremental
Method
points axes
Z X
p1 -10 0
p2 0 15
p3 -10 0
p4 0 -20
p5 20 0
p6 0 5

18. ADDRESS CHARACTERS
O _ _ _ _ Program Name
It must start with ‘O’ followed by 4 digits 0000 to 9999
T_ _ _ _ Tool number
It must be start with ‘T’ followed by four digits whereas first two
digit represents tool number (01 to 12) and the next two digit
represents offset number (01 to 64)
A Angle
R Radius
F Feed Rate(mm/rev)
S Spindle Speed (rpm)

19. OFFSETS IN CNC
Offset - compensation of something
Geometry offset:
difference between machine’s(Tool) reference point and
work’s reference point

20. OFFSETS IN CNC
Wear offset:
• Compensation of an error (difference between observed
dimension and desired dimension)
• The value which is given to compensate the worn out of the
tool.

21. Unit Considerations
Sl.
no.
Input Machine
consideration
1) 1 1 micron
2)1.0 1mm
3)0.1 100 microns
Note: 1mm = 1000 microns

22. G-code
Preparatory code- where and how the tool has to move.
G00 - Rapid Traverse (syntax: G00 X_ Z_)
G01 - Linear Interpolation (G00 X_ Z_ F_)
G02 - Circular Interpolation Clockwise (G02 X_ Z_ R_ F_ )
G03 - Circular Interpolation Counter Clockwise. (G02 X_ Z_ R_ F_ )
G28 - Return to home position (G28 U0 W0)
G97 - Constant Spindle Speed (G97 S1500 M03)
G50 - Maximum Spindle Speed (G50 S1500)

23. M-code
Miscellaneous code (diverse characteristics)

M00- Program end
M01- Optional Stop
M03- Spindle ON Clockwise
M04- Spindle ON Counter Clockwise
M05- Spindle OFF
M06- Automatic Tool Changer
M07&M08- Coolant ON
M09- Coolant OFF
M30- Program End & Rewind

24. Part Diagram for Facing Process

44
Φ50
Φ50
40
All Dimensions are in mm
Raw Material Finished
Component

25. CNC Program for Facing
•O1234
•G28 U0 W0
•T0101
•G97 S2000 M03
•G00 X 52.0 Z 2.0 M07
•Z -2.0
•G01 X -1.0 F0.2
•G00 X52.0 Z 0.0
•Z -4.0
•G01 X-1.0 F0.15
•G28 U0 W0
•M05
•M09
•M30
•%
(0,0) Z
44
-Z
-50
50
-X
X

26. Part Diagram for Facing &
Turning Process

54
Φ66
Φ60
50
All Dimensions are in mm
Raw Material Finished
Component

27. CNC Program for Facing and Turning
•O1234
•G28 U0 W0
•T0101
•G97 S2000 M03
•G00 X 68.0 Z 2.0 M07
•Z -2.0
•G01 X -1.0 F0.2
•G00 X68.0 Z-2.5
•X -4.0
•G01 X-1.0 F0.2
•G00 X64.0
•G01 Z-54.0 F0.2
•G00 X66.0 Z-3.0


•G01 Z-54.0 F0.2
•G00 X60.0 Z-3.5
•G01 Z-54
•G28 U0 W0
•M05
•M09
•M30
•%

STARTUP (Common to all prog.)
FACING
TURNING
ENDING (Common to all prog.)

28. Queries?

29. Program for Practice

34
Φ54
Φ48
20
All Dimensions are in mm
Raw Material Finished
Component
10
Φ40

30. Formative Assessment II
•___ code is used for circular
interpolation clockwise direction.
•G01
•G02
•G03
•G04
•G05

31. Stimulating question

32. Mind Map
CNC
PROGRAMMING
G codes M
codes
Coordinate
systems
Program 1
Program 2

33. Discussion
33

34. Summary
34

35. •Thank you

36. Thank You:)