HEIDENHAIN TNC 640 User Manual page 578

12
12.14 Dwell time FUNCTION FEED
Programming dwell time
Application
Refer to your machine manual.
Read and note the functional description of the machine
tool builder.
Follow the safety precautions.
The FUNCTION FEED DWELL function can be used to program a
recurring dwell time in seconds, e.g. to force chip breaking in a
turning cycle. Program FUNCTION FEED DWELL immediately prior
to the machining you wish to run with chip breaking.
The defined dwell time from FUNCTION FEED DWELL is effective in
both milling and turning operations.
The FUNCTION FEED DWELL function is not effective with rapid
traverse movements and probing motion.
Caution: Danger to the tool and workpiece!
When the FUNCTION FEED DWELL function is active, the
control will repeatedly interrupt the feed movement. While the
feed movement is interrupted, the tool remains at its current
position while the spindle continues to turn. Due to this behavior,
workpieces need to be scrapped if threads are cut. In addition,
there is a danger of tool breakage during execution!
Deactivate the FUNCTION FEED DWELL function before
cutting threads
Procedure
Example
13 FUNCTION FEED DWELL D-TIME0.5 F-TIME5
Proceed as follows for the definition:
Show the soft-key row with special functions
Press the PROGRAM FUNCTIONS soft key
Press the FUNCTION FEED soft key
Press the FEED DWELL soft key
Define the interval duration for dwelling D-TIME
Define the interval duration for cutting F-TIME
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NOTICE
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Special Functions | Dwell time FUNCTION FEED