19
Manual axis motion in the tool direction
on 5-axis machines
The safe retraction of a tool is very
important with 5-axis machining. The
“Virtual Tool Axis” function is of assistance
here. You can use it to traverse the tool in
the current direction of the tool axis
through an external direction key or the
handwheel. This function is especially
useful if you want to
• retract the tool in the direction of the tool
axis during interruption of a 5-axis
machining program,
• use the handwheel or external direction
keys to perform an operation in Manual
mode with an inclined tool,
• move the tool with the handwheel in the
active tool axis direction during
machining.
Machining cylindrical surfaces*
With the TNC 640 it is quite easy to
program contours (consisting of straight
lines and arcs) on cylindrical surfaces using
rotary and tilting tables: You simply
program the contour in a plane as if the
cylinder surface were unrolled. You enter a
contour in two dimensions—as if in a
plane—and the TNC 640 then calculates
and machines the corresponding cylindrical
contour.
The TNC 640 features three cycles for
cylindrical surface machining:
• Slot milling (the slot width is the same as
the tool diameter)
• Guide-groove milling (the slot width is
greater than the tool diameter)
• Ridge milling
* These functions must be implemented in the
machine and TNC by the machine tool builder.
Linear feed rate for rotary tables in
mm/min*
In the standard version, the feed rate of
rotary axes is programmed in degrees/
minute. However, the TNC 640 can
interpret this feed rate in mm/min as well.
The feed rate at the contour is then
independent of the distance of the tool
center from the center of the rotary axis.
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