Programming:
Partial machining of the part means that drilling will take place after a series of different operations, including turning. Given that the origin of drilling is at the zero part and that programming is always effected in absolute terms from this zero onwards, the drilling operation would cause the part the go back into the guide bush, meaning that bar guidance is no longer guaranteed. To prevent this from happening and to ensure that the part does not move when drilling starts (operation 1:7), you should use an additional T91 geometry, which will be adapted to the T91 geometry at Z.
Tip:
The value of Z of the T91 geometry must be calculated according to the following formula:
- Z = (last value programmed in Z for the previous drilling operation)
+ (standard geometry for Z thread chaser 1 and 2)
The geometry T91 must be linked with the last support used in the operation preceding drilling.
Example 2 (for the DECO 13a):
Drilling tool T31, following turning of a diameter of 8 mm, length 35, with tool T12.
| ISO operations code |
| |
| Operation 1:6 |
Turning Ø8 length 35 |
| ISO code: |
G1 Z=1 G100 |
|
G1 X1=5 G100 |
|
G1 Z1=0.5 F0.2 |
|
G1 Z1=-1 X1=8 F0.05 |
|
G1 Z1=-35 F0.2 |
|
G1 X1=12 F0.07 |
|
G1 Z1= -36 X1=14 F0.05 |
|
G1 X1=20 G100 |
| Operation 1:7 |
Positioning Z1=1, T91 |
| ISO code: |
G1 Z1=1 G100 T91 |
| Operation 5:1 |
Macro G915 |
| ISO code: |
G915 |
| Operation 3:3 |
Positioning Z3=1, T31 |
| ISO code: |
G1 Z3=1 G100 T31 |
| Operation 1:8 |
Drilling Z1 |
| ISO code: |
G1 Z1=-15 F0.05 |
|
G1 Z1=1 G100 |
T91/T95 tool geometry:
Geometry value at Z:
(last value programmed in Z for operation 1:6) + (standard geometry) (-36) + (-25) = -61
NOTE: Link T91 geometry with support 12, which corresponds to the last tool used before drilling!
THINK PARTS THINK TORNOS
privacy - copyright-disclaimer © 1997 - 2008 - Tornos - eMail:
ascl.com
|
