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96-8000 Rev AC
May 2010
Thread Milling
Thread milling uses a standard G02 or G03 move to create the circular move
in X-Y, then adds a Z move on the same block to create the thread pitch. This
generates one turn of the thread; the multiple teeth of the cutter generate the
rest. Typical line of code: N100 G02 I-1.0 Z-.05 F5. (generates 1-inch radius for
20-pitch thread)
Thread Milling notes: Internal holes smaller than 3/8 inch may not be possible
or practical. Always climb cut the cutter.
Use a G03 to cut I.D. threads or a G02 to cut O.D. threads. 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/Threads per inch (Example - 1.0 divided by 8 TPI = .125)
Thread Milling Example:
This program will I.D. thread mill a 1.5 x 8 TPI hole using a .750 diameter x 1.0
thread hob.
To start, take the hole diameter (1.500). Subtract the cutter diameter .750 and
then divide by 2. (1.500 - .75) / 2 = .375
The result (.375) is the distance the cutter starts from the I.D. of the part.
After the initial positioning, the next step of the program is to turn on cutter
compensation and move to the I.D. of the circle.
The next step is to program a complete circle (G02 or G03) with a Z-axis com
-
mand of the amount of one full pitch of the thread (this is called “helical interpo-
lation”)
The last step is to move away from the I.D. of the circle and turn off cutter
compensation
Cutter compensation cannot be turned off or on during an arc movement. A lin-
ear move must be made, either in the X or Y axis to move the tool to and from
the diameter to cut. This move will be the maximum compensation amount that
can be adjusted.
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