2.8.15 THREAD CUTTING, CONTINUOUS
THREAD CUTTING (G 32) (Cent’d)
EXAMPLE : Taper Thread
Thread lead L = 4.0 mm
51=3. Omm
62=2. Omm
Cutting depth = 1.0 mm
GOO X13. ;
G32 x38. W-35. F4.
o;
GOO x60. ;
W35. ;
X-n. ;
G32 X36. w-35. ;
GOO x60. ;
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Continuous thread cutting
G32 X( U)... Z(W) . . . F(E) . . . ;
(G32) X( U)... Z(W). ;
(G32) X(U)”” Z(W)”. ;
This command executes thread cutting.
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1.
(b) Worm Screw
Since the stop time between thread cutting
blocks is approximately zero, smooth, con-
tinuous thread cutting is possible. If
thread lead specification is changed midway,
the thread becomes irregular near the
boundary of blocks.
Notes :
1.
2.
3.
4.
5.
6.
7,
Allowances 6 1 and 6 z are required for thread
cutting because lead error occurs near the
starting and end points.
+x
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(.
& ‘!
—
—
— .Z
If spindle speed is not constant during thread
cutting, the leads become incorrect due to the
servo lag.
Threading up for thread is not effective at
G32.
If necessary, G92 (or G76t) should be
commanded.
The following operation is disregarded dur-
ing thread cutting including G 32
. Feedrate Override
0.0 Regarded as 100%
o Feed Hold Operation
. Single Block Operation
The G 32 command should not be commanded
in G98 mode.
In Dry Run mode, the tool moves at Jog feed-
rate.
Do not command M code for continuous thread
cutting.
If commanded, the commanded block
stops as feedhold and will not permit con-
tinuous thread cutting.
(a)
Pipe Joint
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