2.8.16 MULTI-START
(Cent’d)
(3) Number of starts
In principle, the
THREAD CUTTING (G32) t
and B code
thread starting points on
the workpiece circumference sh&jd divide
the circumference into equal portions.
2START THREAD
3-START TbREACI
4-START THREAD
START:NG POINT
STARTING PO NT
STARTING POINT
@&@
1 S- n-READ NO 8
1ST ‘H REAC
NC e 1 ST T-IREAD hO B
CO MtJAh D
c c 1.1b>’-.h 2
COMI.lANG
21,: ‘1PEA2 E180
2ND THRE/t2 6’20
2N0 TH5EAD B90
3RD T}it?EA3 E240
3 R13THREAD 3180
4 T+ THREAD B270
Fig. 2, 22
Notes :
1. Since the angular position detection pulses
(4096 pulses/rev. ) generated from the spin-
dle pulse generator is used to define the
angular position of the spindle with respect
to the starting point as controlled by the B
command, the least detectable increment is
360°/4096 pulses ~, O. 08790/pulse.
From the position commanded by B codes,
an error up to fl pulse may occur.
2. The angular position from the starting pulse
can be specified in both forward and reverse
directions by BO - B 360. commands.
3.
When B command is made to specify angles
outside the permissible range (O - 360.000) ,
alarm “062” is displayed,
If multi-start thread cutting B is speci-
fied, continuous thread cutting cannot be
executed.
EXAMPLE
G32 W“”.
B90
G32 W.”’
Continuous
ting cannot
thread cut-
be performed
because of feedhold at
this block.
EXAMPLE : Two-start Thread
GOO U.. . ;
G32 W.. . F.-.
GOO U.. . ;
w.. . ;
u.. . ;
G32 W.. . ;
GOO U.. . ;
G32 W.. . B180
GOO U.. . ;
w.. . ;
u“”” ;
1
~ Threading of part I@)
G32 W.. . B180. ;
1
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