Operator`s manual

Advanced Haas Mill Programming Techniques Training Manual Page 83
Thread Mill Exercise Solution
Thread Mill a 1.5 Diameter x 10 TPI through hole .5 deep. Use a .5 diameter 4 flute thread mill using cutter
comp. SFM = 400 Feed = .004/rev. Hole is cut to 1.379, the thread minor.
RPM = 3.82 x SFM = 3.82 x 400 = 3056
Diameter .5
Inch/min = RPM x Feed x # flutes = 3056 x .004 x 4 = 48.9 in/min
Internal Threads: F1 = F2 x (Dw – Dc) External Threads F1 = F2 x (Dw + Dc)
Dw Dw
F1 = Programmed feed rate at center of tool
F2 = Actual feed rate desired at the cutting edge
Dw = Thread diameter
Dc = Cutter diameter
F1 = 48.9 x (1.5 -.5) = 32.6 in/min
1.5
N1 T2 M6 (MILL THREAD)
N2 G00 G54 G90 X0 Y0 M03 S509 (Position to hole center in X and Y and turn on spindle)
N3 G43 H2 Z.1 M08 (Turn on tool length compensation, turn on coolant)
N4 G01 Z-.5125 F50. (Start depth plus 1/8 the pitch,
N5 G41 X.375 Y-.375 D2 (Activate cutter comp 45 degrees, ½ radius of finish diameter)
N6 G03 X.75 Y0 I0 J.375 Z-.5 F32.6 (Arc on to finish diameter radius ½ the radius of finish diameter)
N7 G03 I-.75 Z-
.40 (Circular motion counter clockwise 360 degrees cutting thread, move Z positive one
pitch length)
N8 G03 X.375 Y.375 I-.375 J0 Z.0125 (Arc off thread diameter ½ radius of the finish diameter, move up Z
1/ 8 x pitch length)
N9 G01 G40 X0 Y0 F50. (Cancel cutter comp, move to center of thread)
N10 G53 Z0 M9
N11 M30