§
BOSCH
Flexible Automation
Description Stage 4 Chapter 1
CC
lOOM
User
Manual
Set TRA
function
(tangential
rotary
axis)
Reset
TRA
function
(tangential
rotary
axis)
G46
G45
Definition:
The
E axis can be operatad optionally with tangential iRfeed. This function simplifies the use of
rotationally asymmetric tools
such
as
~ades,
punching
dies
and
welding torches etc.
In
this
operating mode, the E axis is rotated at each point
of
the contour to a fixed angle
with
respect
to the resultant
traverse
direction.
The
axes
which
determine
the
direction of
TRA
result
from
the
selected working plane (e.g.
G17.
XIY
piane). The angle between the
contourandTRAcan
be
preset
in
the
part
program.
TRA
rotates the tool
at
a fixed angle relative to the (feeding) speed vector in the
selected working plane.
TRA
requires a continuously rotating axis
with
incremental measuring
system.
TRA
uses the E axis
as
a rotary axis (not a
HIRTH
function); modulo-programmed.
Programming/effect:
o G46 Exx
Range of values for Exx: -360
<= xx
<=
360
o Setting the machine parameters for the
TRA
function:
MP
1 is set to N; this defines the E axis as a rotary axis.
MP
2 is set to N; a 2nd handwheel is
not
permitted.
MP
5 is
set
to N; the E axis
as
a rotary axis is not a Hirth axis.
o
If
G46 E- without value is programmed, the previously programmed E value applies.
o With G46, G30 acts automatically; after each rotation (360°) the actual value
of
the rotary
axis is set to
0 (modulo function).
o G46 acts modally.
o The sign of the E value defines the direction
of
rotation
of
the E axis:
(-)
sign - clockwise rotation
(+) sign - counterclockwise rotation
The
direction
of
rotation of the angle is
not
always the direction
of
rotation of the
TRA
function.
The
direction of rotation of the
TRA
function is dependent upon the shortest distance between
the current position
and
the
new
position.
o The angle between contour
and
E axis can
be
programmed with Exx.
Example:
NIO
G17
Nil
NI2
G90
G46X
.. Y ..
EOO
(the E axis is rotated counterclockwise to an angle of 90°, referred to
the resultant traverse direction in X and V).
o
The
TRA function does
not
act
on axis movements triggered
by
the handwheel if both
handwheels
are active.
1
-21
To Next Page
Loading...
