Step‑by‑Step Guide to Programming Helical Milling Operations

In helical milling program we are widening diameter of hole up to 31.5mm . Lets see how to make program for helical milling ;





O1234 N10  M06 T0606 ; N20  G91 G54 G21 G17 G80 G43 ; N30  M03 S1200 ; N40  G00 X0.0 Y0.0 ‘ N50  G00 Z10 M08 ; N60  G01 Z0 G95 F0.2 ; N70  G01 X15.5 G41 ; N80  G03 I= -15.75 Z= IC (-4) ; N90  G03 I= -15.75 Z= IC (-4) ; N100 G03 I= -15.75 Z= IC (-4) ; N110 G03 I= -15.75 Z= IC (-4) ; N120 G03 I= -15.75 Z= IC (-4) ; N130 G03 I= -15.75 Z= IC (-4) ; N140 G03 I= -15.75 Z= IC (-4) ; N150 G01 X0.0 G40 ; N160 G00 Z50 ; N170 M09 M05 M30 ;
DESCRIPTION O1234 ; N10- Tool change command, select cutter no. 6 .
N20- Program in the incremental coordinate system, work coordinate destination on milling machine, all dimension in “mm”, select xy plane, cancelled canned cycle if apply, tool height offset compensation negative ;
N30 – Spindle on clockwise speed 1200 r.p.m .
N40 – Rapid traverse where at position  X0 & Z0 .
N50- Rapid traverse where tool moves at the position Z10 , coolant is on .
N60- linear interpolation command where Z is 0 . (tool touch to workpiece ) , feed rate per revolution  is 0.2
N70- linear interpolation command where tool take position 15.75 in X axis , tool radius compensation left.
N80- Circular interpolation counterclockwise where I = -15.75 & depth of cut in Z axis is -4 .( first cut imaginary point P0 to P1)       I= An incremental distance and direction from the start point of the arc to the arc centre along the X axis.
N90- Circular interpolation counter clockwise where I = -15.75 & depth of cut in Z axis is -4 . ( Second cut from point P1 to P2) N100- Circular interpolation counter clockwise where I = -15.75 & depth of cut in Z axis is -4 . ( Third cut from point P2 to P3) N110- Circular interpolation counter clockwise where I = -15.75 & depth of cut in Z axis is -4 . ( Fourth cut from point P3 to P4) N120- Circular interpolation counter clockwise where I = -15.75 & depth of cut in Z axis is -4 . ( Fifth cut from point P4 to P5) N130- Circular interpolation counter clockwise where I = -15.75 & depth of cut in Z axis is -4 . ( Sixth cut from point P5 to P6) N140- Circular interpolation counter clockwise where I = -15.75 & depth of cut in Z axis is -4 . ( The seventh cut from point P6 to P7)
N150- linear interpolation command where tool return at starting position X =0 , tool nose compensation off.
N160- Rapid traverse where tool moves at the position Z50 .
N170- Coolant off , spindle off , main program end .