Cnc Milling Worksheet

J3102 / J4102 Workshop Practice

CAD / CAM / CNC / CAE Centre Dept. of Mechanical Engineering Politeknik Sultan Haji Ahmad Shah Kuantan, Pahang, MALAYSIA

CNC_milling WORKsheet 1. Briefly describe CNC technology in the machining environment.

2. Based on the points shown, complete the tables of X and Y co-ordinates of each letter labeled point; assume z=0 for all lettered positions

a. Derive the X and Y data points for a sequence of tool movements in the Absolute Coordinate system as follows: F-G-H-A-C-D-E

Axis

Datum

X

0

Y

0

A

B

C

D

E

F

G

H

b. If the datum is shifted to a new position, derive the X and Y data points for a sequence of tool movements in the Incremental Coordinate system as follows: D – C – A – H – G – F- E

Axis

Datum

X

5

Y

0

A

B

C

D

E

F

G

H

J3102 / J4102 Workshop Practice

CAD / CAM / CNC / CAE Centre Dept. of Mechanical Engineering Politeknik Sultan Haji Ahmad Shah Kuantan, Pahang, MALAYSIA

1. Based on the following program, sketch the cutting path on a graph paper. PROGRAMMING SHEET

MATERIAL:

TITLE:

WRITTEN BY: kubigs Prep Code

Mis c Cod e

N

G

M

1 2 3 4 5 6

G17, G21,G40,G49,G54 G91,G28

G90, G0 G1

-10

7

G3

0

0

0 50 50 0 25

50 50 0 0 0

Lin e #

8 10 11 12 13

SHEET No.

Axis Coordinates X

Y

Z

I

J

K

01

OF

Feed Rate

Spindl e Speed

F

S

01 Tool No. P

Q

R

T

0 M6 M3

G1

X0 Y0 G1

1 1500 -10

14

G3

25

0

15 16 17 18

G1 X25 Y50 X0 Y25 G91 G1

50 25 0 25

25 50 25 -25

19

G90

50

25

20

G2

25

50

21

0

25

22

25

0

25

25

23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

ALUMINIUM – T2010

G0 Z5 X25 Y25 G1 G91 G1

5 -1

1 0

200 0

-1

G90 G0 G91 G28

0 2 0 -4 0 6 0 -8 0 30 0

M3

2 5

2 5 2 5 2 5 2 5 5

2 0 -4 0 6 0 -8 0 8

150

J3102 / J4102 Workshop Practice

CAD / CAM / CNC / CAE Centre Dept. of Mechanical Engineering Politeknik Sultan Haji Ahmad Shah Kuantan, Pahang, MALAYSIA

0

2. Write the program for the milling project given using the programming sheet format.

3. Give FIVE advantages and FIVE disadvantages of CNC machines. 4. Sketch a CNC Vertical Milling machine and name major component parts. 5. The most important part in a cnc machines is its controller. Name FIVE controller types that is being used today and why it is different from each other. 6. Briefly describe CAD/CAM technology where the application of computers for product design and validation towards the manufacturing process using CNC machines.