CNC PROGRAMMING FOR STEP TURNING AND FACING OPERATION

       In following fig the dimension of billet diameter 25 mm and total length 50mm . In these cnc operation we will perform facing 10 mm and making two step turing whoes diameter 20 mm and 16 mm.

HARSH.MPF

N1  G90 G71 G94 F100 ;

N2  G28 X0 Z0 ;

N3  M06 T06 D01 ;

N4  M03 S1000 ;

N5  M07 ;

N6  G00 X27 Z2 ;

N7  G01 X25 Z0 ;

N8  G01 X25 Z-2 ;

N9  G01 X-1 Z-2 ;(Facing start cut 2 mm)

N10 G00 X27 Z-2 ;

N11 G00 X27 Z2 ;

N12 G01 X25 Z-2;

N13 G01 X25 Z-4 ;

N14 G01 X-1 Z-4 ;

N15 G00 X27 Z -4 ;

N16 G00 X27 Z2 ;

N17 G01 X25 Z2 ;

N18 G01 X25 Z-6 ;

N19 G01 X-1 Z-6 ;

N20 G00 X27 Z-6 ;

N21 G00 X27 Z2 ;

N22 G01 X25 Z2 ;

N23 G01 X25 Z-8 ;

N24 G01 X-1 Z-8 ;

N25 G00 X27 Z-8 ;

N26 G00 X27 Z2 ;

N27 G01 X25 Z2 ;

N28 G01 X25 Z-10 ;

N29 G01 X-1 Z-10 ; (Facing end)

N30 G00 X27 Z-10 ;

N31 G00 X27 Z2 ;

N32 G00 X25 Z2 ;

N33 G01 X25 Z-25 ; ( First step turning start CUT =0.5)

N34 G00 X27 Z-25 ;

N35 G00 X27 Z2 ;

N36 G01 X24 Z2 ;

N37 G01 X24 Z-25 ;

N38 G00 X27 Z-25 ;

N39 G00 X27 Z2 ;

N40 G01 X23 Z2 ;

N41 G01 X23 Z-25 ;

N42 G00 X27 Z2 ;

N43 G01 X22 Z2 ;

N44 G01 X22 Z-25 ;

N45 G00 X27 Z-25 ;

N46 G00 X27 Z2 ;

N47 G01 X21 Z2 ;

N48 G01 X21 Z-25 ;

N49 G00 X27 Z-25 ;

N50 G00 X27 Z2 ;

N51 G01 X20 Z2 ;

N52 G01 X20 Z-25 ;( First step turning  end )

N53 G00 X27 Z-25 ;

N54 G00 X27 Z2 ;

N55 G01 X19 Z2 ;

N56 G01 X19 Z-10 ;( Second step turning start cut = 0.5 )

N57 G00 X27 Z-10 ;

N58 G00 X27 Z2 ;

N59 G01 X18  Z2 ;

N60 G01 X18 Z-10 ;

N61 G00 X27 Z-10 ;

N62 G00 X27 Z2 ;

N63 G01 X17 Z2 ;

N64 G01 X17 Z-10 ;

N65 G00 X27 Z-10 ;

N66 G00 X27  Z2 ;

N67 G01 X16 Z2 ;

N68 G01 X16 Z-10 ;(End second step turning)

N69 G28 X0 Z0 ;

N70 M05 ;

N71 M09 ;

N72 M30 

More examples..........!!!!

DESCRIPTION OF PROGRAM

Main prog file name HARSH

N1- Program in absolute co-ordinate system , metric input inmm , feed in mm/min ,Feed rate 100 .

N2 – Tool at reference point  were X0 and Z0 .

N3 – Tool change command , select no of tool 6 , tool offset no 01 .

N4 – Spindle on clockwise at speed 1000 .

N5- Coolent on .

N6- Rapid command at X 27 and Z 2  . ( Tool takes position )

N7 – Linear command tool near to job at X25 and Z0  .

N8-Linear command tool touch to the job at X25 and Z-2 .

N9- Linear command cutting operation start each cut 2 mm .

X-1 and z-2  .(facing)

N10 -  Rapid command tool goes away at X 27 and Z at same place .

N11 – Tool goes rapidly at safe position at X27 and Z2 .

N12 – Tool ready at x axis for another cut linearly .

N13- Tool touch to job for next cutting linearly .

N14- Linear command cutting operation start each cut 2 mm .

X-1 and Z-4  .(facing)

N15- -  Rapid command tool goes away at X 27 and Z at same place .

N16- Tool goes rapidly at safe position at X27 and Z2 .

N17- Tool ready at x axis for another cut linearly .

N18 - Tool touch to job for next cutting linearly .

N19- Linear command cutting operation start each cut 2 mm .

X-1 and Z-6  .(facing)

N20- Rapid command tool goes away at X 27 and Z at same place .

N21- Tool goes rapidly at safe position at X27 and Z2 .

N22- Tool touch to job for next cutting linearly .

N23- Tool touch to job for next cutting linearly

N24- Linear command cutting operation start each cut 2 mm .

X-1 and Z-8  .(facing)

N25- Rapid command tool goes away at X 27 and Z at same place .

N26- Tool goes rapidly at safe position at X27 and Z2 .

N27- Tool ready at x axis for another cut linearly

N28- Tool touch to job for next cutting linearly

N29-- Linear command cutting operation start each cut 2 mm .

X-1 and Z-10  .(Facing operation end)

N30- Rapid command tool goes away at X 27 and Z at same place .

N31- Tool goes rapidly at safe position at X27 and Z2.

N32 - Tool ready at x axis for another cut linearly.

N33- Linear command cutting operation start each cut 0.5 mm .

X25 and Z-25  .(first step turning start)(means each turning cut reduce 1 mm diameter)

N34- Rapid command tool goes away at X 27 and Z at same place.

N35- Tool goes rapidly at safe position at X27 and Z2.

N36- Tool touch to job for next cutting linearly at X24 .

N37- Linear command cutting operation start each cut 0.5 mm .

X24 and Z-25  . (means each turning cut reduce 1 mm diameter)

N38- Rapid command tool goes away at X 27 and Z at same place

N39 - Tool goes rapidly at safe position at X27 and Z2.

N40- Tool touch to job for next cutting linearly at X23 .

N41- Linear command cutting operation start each cut 0.5 mm .

X23 and Z-25  . (means each turning cut reduce 1 mm diameter)

N42- Rapid command tool goes away at X 27 and Z at same place

N43- Tool goes rapidly at safe position at X27 and Z2.

N44- Tool touch to job for next cutting linearly at X22 .

N45- Linear command cutting operation start each cut 0.5 mm .

X22 and Z-25  . (means each turning cut reduce 1 mm diameter)

N46- Rapid command tool goes away at X 27 and Z at same place

N47- Tool goes rapidly at safe position at X27 and Z2.

N48- Tool touch to job for next cutting linearly at X21 .

N49- Linear command cutting operation start each cut 0.5 mm .

X21 and Z-25  . (means each turning cut reduce 1 mm diameter)

N50- Rapid command tool goes away at X 27 and Z at same place.

N51- Tool goes rapidly at safe position at X27 and Z2.

N52-  Tool touch to job for next cutting linearly at X20.

N53- Linear command cutting operation start each cut 0.5 mm .

X21 and Z-25  .( firtst step Turning end ) (means each turning cut reduce 1 mm diameter)

N54- Rapid command tool goes away at X 27 and Z at same place

N55- Tool goes rapidly at safe position at X27 and Z2.

N56-  Tool touch to job for next cutting linearly at X19.

N57 - Linear command cutting operation start each cut 0.5 mm .

X19 and Z-25  .( Second step Turning start ) (means each turning cut reduce 1 mm diameter)

N58- Rapid command tool goes away at X 27 and Z at same place

N59- Tool goes rapidly at safe position at X27 and Z2.

N60 - Tool touch to job for next cutting linearly at X18.

N61- Linear command cutting operation start each cut 0.5 mm .

X18 and Z-25  . (means each turning cut reduce 1 mm diameter)

N62- Rapid command tool goes away at X 27 and Z at same place

N63- Tool goes rapidly at safe position at X27 and Z2.

N64 - Tool touch to job for next cutting linearly at X17.

N65- Linear command cutting operation start each cut 0.5 mm .

X17 and Z-25  . (means each turning cut reduce 1 mm diameter)

N66- Rapid command tool goes away at X 27 and Z at same place.

N67 - Tool goes rapidly at safe position at X27 and Z2.

N68- Tool touch to job for next cutting linearly at X16.

N69- Linear command cutting operation start each cut 0.5 mm .

X16 and Z-25  . (means each turning cut reduce 1 mm diameter)

N70 - Tool at reference point  were X0 and Z0 .

N71- Spindle off .

N72 – Coolent off .

N73 – Main program end .