chap-14_hay!!

8/14/2019 Chap-14_Hay!!

1/15

CAD/CAM Principles and Applications 14 Turning Centre Programming 14-1/14-15by P.N.Rao

14. Turning Centre Programming

14.1 Differences between machining centres and turning centres

14.2 Tape Formats used in turning centres

/, N, G, X, Z, U, W, B, C, I, K, P, Q, R, A, F, S, T, M

14.3 AXES SYSTEM

Fig. 14.1 Axes system used for turning centres

8/14/2019 Chap-14_Hay!!

2/15


Fig. 14.2 The tool offsets that are required for each of the tool in theturret

Fig. 14.3 Measuring the tool offsets with a mandrel

14.4 General Programming Functions

14.4.1 Tool Function

8/14/2019 Chap-14_Hay!!

3/15


Fig. 14.4 Measuring the tool offsets with a mandrel

Table 14.1 Contents of the tool offset registers

Offset

registernumber

X-axis

offsetamount

Z-axis

offsetamount

Tool

noseradius

Tool nose

radiusdirection

01 120.040 15.20 0.8 0

02 121.410 18.65 0.8 0

.

.

14.4.2 Speed Function

14.4.3 Feed Specification

G98 feed in mm/minG99 feed in mm/rev.

G98 F 200 (200 mm/min)

8/14/2019 Chap-14_Hay!!

4/15


14.4.4 Units

14.4.5 Miscellaneous Functions

M00 -Program stop

M01 - Optional stop

M02 - End of program

M03 -Spindle start in clock wise

M04 -Spindle start in counter clock wise

M05 -Spindle stop

M08 Coolant ON

M09 Coolant OFF

M13 Main Spindle clock wise/Coolant ON

M14 Main Spindle counter clockwise/Coolant ON

M30 -End of program and rewind

14.4.6 Program number

14.4.7 Block number

14.5 MOTION COMMANDS

G00 Rapid positioning

8/14/2019 Chap-14_Hay!!

5/15


Fig. 14.5 Example for rapid positioning

G01 Linear interpolation

Fig. 14.6 Example for linear interpolation with feed

G02 Circular interpolation clockwiseG03 Circular interpolation counter clockwise

8/14/2019 Chap-14_Hay!!

6/15


Fig. 14.7 Example for circular interpolation with feed

Fig. 14.8 Example for circular interpolation using centre co-ordinates

G04 Dwell

14.5.1 CHAMFER AND CORNER RADIUS

Chamfer:

8/14/2019 Chap-14_Hay!!

7/15


Fig. 14.9 Example for chamfering

CORNER RADIUS:

Fig. 14.10 Example for corner radius

14.5.2 Tool nose radius compensation

8/14/2019 Chap-14_Hay!!

8/15


Fig. 14.11 Offset path generated by the controller when using G42 for toolnose radius compensation

Fig. 14.12 Tool nose radius correction

8/14/2019 Chap-14_Hay!!

9/15


Fig. 14.13 Tool nose radius correction directions

14.6 CUT PLANNING

8/14/2019 Chap-14_Hay!!

10/15


Fig. 14.14 Cut planning for a turned component

14.6.1 EXAMPLE

Fig. 14.15 Part drawing to be used as an example for cut planning for aturned component

8/14/2019 Chap-14_Hay!!

11/15


Table 14.1 Process plan for component shown in Fig. 14.15

Opera-tion

Description Tools Cutting Speed,

m/min

Feed,mm/rev

10 Facing T01, Facing tool 200 0.3020 Rough turning T02 Roughing

tool200 0.35

30 Finish turning T03 Finishingtool

300 0.20

Fig. 14.16 Cut planning of the part shown in Fig. 14.15.

8/14/2019 Chap-14_Hay!!

12/15


Fig. 14.17 Rough cuts to be taken for the part shown in Fig. 14.15.

Fig. 14.18 Finish cut to be taken for the part shown in Fig. 14.15.

14.7 Thread Cutting

8/14/2019 Chap-14_Hay!!

13/15


Fig. 14.19 Depth of cut in thread cutting

Fig. 14.20 An example for thread cutting.

14.8 Canned cycles

14.8.1 Turning canned cycle

8/14/2019 Chap-14_Hay!!

14/15


Fig. 14.21 Rough turning canned cycle operation.

Fig. 14.22 Rough turning canned cycle operation.

Fig. 14.23 Rough turning canned cycle for tapered surfaces.

8/14/2019 Chap-14_Hay!!

15/15


14.8.2 Facing canned cycle

Fig. 14.24 Face cutting canned cycle operation.

14.8.1 Thread cutting canned cycle G92

chap-14_hay!!

Documents