2 8.19 TOOL NOSE RADIUS COMPENSATION
(G 40 THROUGH G 44)
Because
of a nose radius of lathe tools, there is
a deviation between the desired curve and the
actual curve produced.
Therefore, tool offsets
are not enough for taper and circular cuttings.
The tool nose radius compensation option resolves
the problem of nose radius.
See Fig. 2.26.
m—- -+
(1)
a.
b.
Tool
CENTER
j ‘TOOL NOSER
PROGRAtiMED CIJTTING CONTOUR,
WITH TOOL NOSE RADIUS
COMPENSATION
\
VIRTUAL
TOOL NOSE
Fig. 2.26
nose radius values
Radius value storage
Tool nose radius value must be written in the
storage before the tool nose radius compen-
sation is commanded.
Number of pairs that
can be written in the storage depends upon
the machine.
T 3-digit: 9 sets
T 4-digit:
16 or 50 sets
Refer to 2.6.2, “
Tool Offset Memory+ .“
Range of tool nose radius values
Radius value can be set within the following
range.
Metric
Inch
i
o *99.999 I o *9.9999
c. Setting of tool nose radius values
Radius value of tool nose must be set with-
out signs.
VIRTJAL
TIP NOSE
For the writing
ALL ROUND
INSERT
Fig. 2.27
of radius values for tool
nose radius compensation, refer to Fig .
4.3.5 Displaying and Writing Tool Offset
Data.
The address character is R .
(2) T code designation
a.
The T code for tool nose radius compensation
must be programmed with sign (+ or -) .
T f ~n ~’~ (In the case of T 4-digit)
l--T-l-
L
1-
Offset number for tool position
offset and tool nose radius
compensation
Tool number
~ Direction of tool nose radius
ll+l! . . .
rl_ll . . .
compensation
Right side viewed in the direction
of tool travel
Left side viewed in the direction
of tool travel
““1’-“
..,1. ,,
‘x-lfiii24iiL
Fig. 2.28
b . When a tool is used for turning and for fac-
ing , as the direction of tool motion changes ,
the correct direction of compensation should
be programmed with sign of T code .
*
q,~~.
s,~~
,X
CO!b)PEhSATION (T ~ ‘
LEFT SIDE
COMPENSATION T
—
—-z
Fig. 2.29
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