THREADMILLING 2" NPT
(NATIONAL PIPE TAPER)
G-CODE

CNC G-Code program "O31 Setup" and "O32 Body"
Used to threadmill 4 part fixture load on Fanuc OM control...
4 parts on pallet, Tool Ball in Center of pallet

O31 (THREAD MILL SETUP)
G90 G80 G40 G17
G28 G91 Z0.0 M9
G90
T1 (ADVENT 5 FLUTE #175-TA-125-F5 THREAD MILL)
G90 G0 G54(BALL ZERO) X2.1840 Y3.0370 M3 S1194(500SFM)
G43 Z2. H1 M8
X2.1840 Y3.0370 (PART 1 C/L OF BORE)
Z1.
M98 P32
M01
M03
M08
X-3.0370 Y2.1840 (PART 2 C/L OF BORE)
Z1.
M98 P32
M01
M03
M08
X-2.1840 Y-3.0370 (PART 3 C/L OF BORE)
Z1.
M98 P32
M01
M03
M08
X3.0370 Y-2.1840 (PART 4 C/L OF BORE)
Z1.
M98 P32
G28 G91 Z0.00 M9
G28 G91 Y0.00 (BRING PALLET TO DOOR FOR PART CHANGE)
G90
M30

O32 (THREAD MILL ACTION INCREMENTAL)
(TOOL IS 1.0 ABOVE TOOLBALL OVER C/L OF BORE)
(D21 IS OFFSET FOR STOCK LEFT AFTER ROUGHING/+.010)
(D22 IS ADJUSTMENT FOR FINAL SIZE/ZERO FOR NEW INSERTS)
G91 G0 Z-2.4456 (PLUNGE TOOL FOR ROUGH CUT)
G1 G41 X0.0 Y0.0 D21 F7.6
G3 X0.375 Y0.0 I0.1875 J0.0 Z0.0435 F3.0 (ROLL IN)
G3 X-0.3750 Y0.3757 I-0.3757 J0.0000 Z0.0217 F3.8
G3 X-0.3764 Y-0.3757 I0.0000 J-0.3763 Z0.0217
G3 X0.3764 Y-0.3770 I0.3770 J0.0000 Z0.0217
G3 X0.3777 Y0.3770 I0.0000 J0.3777 Z0.0217
G3 X-0.3777 Y0.0 I-0.1888 J0.0 Z0.0435 F100.0 (ROLL OUT)
G0 Z0.4348 (SHIFT TOOL UP TO FINISH CUT)
G1 G41 X0.0 Y0.0 D22 F7.6
G3 X0.3980 Y0.0 I0.1990 J0.0 Z0.0435 F7.6 (ROLL IN FINISH CUT)
G3 X-0.3980 Y0.3987 I-0.3987 J0.0000 Z0.0217 F7.6
G3 X-0.3994 Y-0.3987 I0.0000 J-0.3993 Z0.0217
G3 X0.3994 Y-0.4000 I0.4000 J0.0000 Z0.0217
G3 X0.4007 Y0.4000 I0.0000 J0.4007 Z0.0217
G3 X-0.4007 Y0.0 I-0.2004 J0.0 Z0.0435 F100.0 (ROLL OUT)
G0 G90 G40
Z2.0
M99

SOURCE ON CUTTER USED:
Jim Hartford (800) 847-3234
Advent Tool & Manufacturing Inc.
TEL (708) 549-9737
FAX (708) 549-9714

Closeup of Advent 5 flute inserted Threadmill. Each part in the fixture is threaded in a single roughing revolution, leaving .010", then a finish revolution takes the part to guage size. We use coolant more to keep things cool and the dust down than to lubricate the Cast Iron. The Advent Threadmill has enough flute length that we rough on the upper portion of the tool where it is presumably stiffer, then shift the tool up for the finish pass to expose new bite at the bottom that sees less wear, sand, etc. A set of inserts lasts about 500 parts. Inserts cost about $37.00 ea and it takes 5 of them. They change out and re-index perfectly in about 5 minutes.

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THREADMILLING 2" NPT (NATIONAL PIPE TAPER) G-CODE

THREADMILLING 2" NPT
(NATIONAL PIPE TAPER)
G-CODE