248
PROGRAMMING EXAMPLES
96-8000
June 1999
M98 P3701
G00 Z.1
G100 X0. Y0. (Cancel mirror image X and Y axes)
G28 G91 Y0 Z0
M30
O3701 (Contour subprogram)
G01 X-.469 Y1.2497
G03 X-.5501 Y1.2967 R.0625
G01 X-1.0804 Y1.12
G03 X-1.12 Y1.0804 R.0625
G01 X-1.2967 Y.5501
G03 X-1.2497 Y.469 R.0625
G01 X-.3658 Y.2923
G03 X-.2923 Y.3658 R.0625
M99
%
THREAD M ILLING
We will use the following example and go through the thread milling procedures step-by-step to get the desired
result:
DATA:
·
I.D. Thread milling a 1.5 x 8 TPI hole.
· Using .750 diameter x 1.0 thread hob.
· Take the hole diameter 1.500. Subtract cutter diameter .750 = .750 Then divide by 2 = .375.
STEP 1: Within this space we need to turn on cutter compensation and ramp on to the circle to be machined.
STEP 2: Perform complete circle while simultaneously moving in the Z-axis the amount of one full pitch of the
thread. This is called helical interpolation.
STEP 3: Ramp off the circle and turn off the cutter compensation.
Note: Always climb cut the cutter.
I.D. will be G03; O.D. will be G02. An I.D. right hand thread will move up in the Z-axis by the amount of one
thread pitch. An O.D. right hand thread will move down in the Z-axis by the amount of one thread pitch.
PITCH = 1.0/Threads per inch
Example 1.0 divided by 8 TPI = .125
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