Siemens SINUMERIK 840C - Manual (Page 840)

06.93 12 Functional Descriptions
12.8.1 Multiple thread
Example:
Three-start thread (each offset by 120 degrees)
G01 G90 X50 S200 M3 LF Starting point
G92 A0 X100 LF 1st thread start (0 degrees)
:
X50 LF
Starting point
G92 A120 X100 LF 2nd thread start (120 degrees)
:
X50 LF Starting point
G92 A240 X100 LF
3rd thread start (240 degrees)
:
12.8.2 Thread re-cutting/setting up
With this function a precut thread with a constant lead can be reloaded and then recut.
A thread with a varying lead cannot be recut!
Procedure:
Select the assigned channel-specific display in the machine area display for ”JOG mode”
using the ”Recut thread” softkey. The option can only be selected if the MD is set, otherwise
the message ”Option not available” appears.
Over
store INC
variable Recut
thread
The precut thread is loaded in the spindle.
Now use the direction keys to move the tool above one of the thread bases.
Then press the softkey ”Store position”. As a result, the ”Offset angle” and the ”Starting
angle (G92A)” are automatically set to zero.
This completes setting up. Now you can start the part program for this thread in ”Automatic”
or ”MDA” mode for which the offset angle of the first thread block is used for calculation. This
offset angle is used until the softkey ”Delete offset angle” is pressed to set the offset angle to
zero.
The offset angle does not remain active after Power On.
The angle is displayed in 3.5 format.
Maximum value: 359.99999 degrees
Resolution = 10
-5 degrees, without a sign.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–65
SINUMERIK 840C (IA)