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Cnc turning lecture4

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  • 1. 10/17/2011 MOHD SHARIZAN BIN MOHD SHARIF Jabatan Kejuruteraan Mekanikal CNC TURNING sharizan/CNC Turning TNA300 1CNC TURNINGTRAUB TNA 300 sharizan/CNC Turning TNA300 2 1
  • 2. 10/17/2011AXIS X Z sharizan/CNC Turning TNA300 3 TURNING MILLING sharizan/CNC Turning TNA300 4 2
  • 3. 10/17/2011Coordinate system for CNCTurning machines sharizan/CNC Turning TNA300 5MACHINE COMMANDCODES G code - Set preparatory machine functions such as rapid traverse mode, feed mode and active tool length offsets. M code - Perform a miscellaneous machine function such as automatic tool changes, coolant control and spindle operations. sharizan/CNC Turning TNA300 6 3
  • 4. 10/17/2011G Instructions G00 Straight line at the rapid traverse G01 Straight line at the feed rate G02 Circular arc, clockwise (right) G03 Circular arc, counter clockwise (left) G26 Approach to tool changing ( Home) G40 Tools nose off G46 Tools nose on G59 Zero point shift G71 Longitude roughing cycle G92 Speed limitation G96 Constant cutting speed sharizan/CNC Turning TNA300 7M Instructions M00 Programmed stop M03 Spindle right (clockwise) M04 Spindle left ( counterclockwise) M05 Spindle stop M08 Coolant on M09 Coolant off sharizan/CNC Turning TNA300 8 4
  • 5. 10/17/2011Program BlockG01 X30 Z-20 F0.2G-Instruction Auxiliary conditions sharizan/CNC Turning TNA300 9Step in programming Start – work piece zero point, cutting speed, tool, spindle rotation, speed limit Facing Roughing process Cutting Close - stop spindle, stop coolant, program stop sharizan/CNC Turning TNA300 10 5
  • 6. 10/17/2011Startexample%O 4546G59 X 0 Z___G96 V___ T___ M___G92 S___ M08 sharizan/CNC Turning TNA300 11Startexample Symbol% Program numberO 4546G59 X 0 Z___G96 V___ T___ M___G92 S___ M08 sharizan/CNC Turning TNA300 12 6
  • 7. 10/17/2011 Start example % O 4546 Zero point shift G59 X 0 Z___ G96 V___ T___ M___ G92 S___ M08 sharizan/CNC Turning TNA300 13 G59 – zero point shift G59 X 0 Z___ CALCULATE Z spindle length = 150mmMachine zero point Workpiece zero point + Work piece length = ______ + allowance = 10mm TOTAL = ______ sharizan/CNC Turning TNA300 14 7
  • 8. 10/17/2011Startexample%O 4546G59 X 0 Z___ Constant cutting speedG96 V___ T___ M___G92 S___ M08 sharizan/CNC Turning TNA300 15Startexample% ToolsO 4546G59 X 0 Z___G96 V___ T___ M___ SpindleG92 S___ M08 rotation sharizan/CNC Turning TNA300 16 8
  • 9. 10/17/2011G96 V___ T___ M___ V ____ VELOCITY – by calculation or table T ____ No of Tools M____ Spindle rotation ( CW / CCW ) sharizan/CNC Turning TNA300 17Startexample% Speed limitO 4546G59 X 0 Z___G96 V___ T___ M___G92 S___ M08 Coolant on sharizan/CNC Turning TNA300 18 9
  • 10. 10/17/2011G92 S____M__ S2000 SPEED LIMIT – calculation or table M08 Coolant on sharizan/CNC Turning TNA300 19CLOSEexampleG26 Approach to tools changing (home)M05 M09 Spindle stop/Coolant offM00 Program stop% sharizan/CNC Turning TNA300 20 10
  • 11. 10/17/2011PROGRAMMING TECHNIQUEUsing G code sharizan/CNC Turning TNA300 21PROGRAMMING TECHNIQUE sharizan/CNC Turning TNA300 22 11
  • 12. 10/17/2011 PROGRAMMING TECHNIQUEG0 X20 Z2G1 X20 Z-15 F0.2 F - federateG2 X40 Z-25 R10G1 X40 Z-40G3 X60 Z-50 R10G1 X60 Z-75 X = Diameter of work piece sharizan/CNC Turning TNA300 23 EXAMPLE 1 X Ø30 Ø19 Z 15 20 Unit : mm sharizan/CNC Turning TNA300 24 12
  • 13. 10/17/2011EXAMPLE 1- solution%O 652G59 X0 Z180 STARTG96 V200 T0202 M03G92 S2000 M08G00 X32 Z0 FACINGG01 X-1 Z0 F0.2G00 X26 Z2G01 X26 Z-20G00 X27 Z-20G00 X27 Z2G00 X22 Z2 ROUGHINGG01 X22 Z-20G00 X23 Z-20G00 X23 Z2G00 X19 Z2G01 X19 Z-20G00 X32 Z-20G26M5 M9 CLOSEM0% sharizan/CNC Turning TNA300 25EXAMPLE 2 - CUT X Ø30 Ø19 Z 15 20 Unit : mm sharizan/CNC Turning TNA300 26 13
  • 14. 10/17/2011EXAMPLE 2- solution%O 652 G96 V200 T0101 M04G59 X0 Z190 START G92 S2000 M08G96 V200 T0202 M03 G00 X32 Z-36.5G92 S2000 M08 G01 X26G00 X32 Z0 G00 X27 FACING G01 X22G01 X-1 Z0 F0.2G00 X26 Z2 G00 X23 G01 X18 CUTG01 X26 Z-20G00 X27 Z-20 G00 X19G00 X27 Z2 G01 X14G00 X22 Z2 G00 X15 ROUGHINGG01 X22 Z-20 G01 X10G00 X23 Z-20 G00 X11G00 X23 Z2 G01 X6G00 X19 Z2 G00 X7G01 X19 Z-20 G01 X2G00 X32 Z-20 G00 X3G26 G01 X0 G26 M5 M9 CLOSE M0 % sharizan/CNC Turning TNA300 27EXAMPLE 3 Unit : mm X Ø35 Ø30 Ø22 Z 20 15 15 sharizan/CNC Turning TNA300 28 14
  • 15. 10/17/2011EXAMPLE 3 - solutionSTART PROGRAMMED% END PROGRAMMED0 5451 G26G59 X0 Z190 M05 M09G96 V200 T0202 M03 M00G92 S2000 M08 %FACING OBJECTG00 X37 Z0G01 X-1 Z0 F0.2G00 X37 Z2ROUGHING CYCLEG71 P60 Q70 I0.02 K0.02 D1 F0.2G26SUB PROGRAMMEDN60G46G00 X0 Z0G01 X22 Z0G01 X22 Z-15G01 X30 Z-15G01 X30 Z-30G01 X35 Z-30G40N70G26 sharizan/CNC Turning TNA300 29EXAMPLE 4 sharizan/CNC Turning TNA300 30 15
  • 16. 10/17/2011EXAMPLE 4 - solution%O55 G00 X11G59 X0 Z210 G01 X6G96 V200 T0202 M03 G00 X7G92 S2000 M08 G01 X2G00 X20 Z0 G00 X3G01 X-1 Z0 F0.2 G01 X0G00 X20 Z0 G26G71 P80 Q90 I0.2 K0.2 D2 F0.2 M5 M9G26 M0N80 %G46G00 X0 Z0G01 X4 Z0G01 X4 Z-15G02 X8 Z-20 R10G01 X8 Z-35G03 X-18 Z-45 R15G01 X-18 Z-50G40N90G26G96 V200 T0101 M04G92 S2000 M08G00 X20 Z-51.5G01 X14G00 X15G01 X10 sharizan/CNC Turning TNA300 31EXAMPLE 5- bulb sharizan/CNC Turning TNA300 32 16
  • 17. 10/17/2011 DATA REQUIRED - bulb Program Number : O041 Cutting Rough part : Feed 0.5 mm/rev Diameter = 19mm Cont cutting rate 400mm/min Length = 49mm Working Zero Point G59 Tools Chuck + jaw = 150mm Facing = T0202 + rough part = 49mm Roughing = T0202 + clearance = 10mm Cutting = T0101 Zero point shift = 209mm Metal working data Facing Feed 0.4 mm/rev Speed 2000rpm Cont cutting rate 200mm/min Roughing Feed 0.2 mm/rev Cont cutting rate 200mm/min sharizan/CNC Turning TNA300 33% EXAMPLE 5 - solutionO041 G00 X21 Z-50.5G59 X0 Z209 G01 X15 F0.5G96 V200 T0202 M03 G00 X16G92 S2000 M08 G01 X11G00 X21 Z0 G00 X12G01 X-1 Z0 F0.4 G01 X7G00 X21 Z2 G00 X8G71 P70 Q80 I0.2 K0.2 D1 F0.2 G01 X3G26 G00 X4N70 G01 X0G46 G26G00 X0 Z0 M05 M09G03 X3 Z-1 R2 M00G03 X19 Z-25 R38 %G03 X10 Z-35 R13.555G01 X10 Z-45G03 X8 Z-49 R6.9G00 X12 Z-38G01 X9 Z-38 G00 X12 Z-38G00 X12 Z-41G01 X9 Z-41G00 X12 Z-41G00 X12 Z-44G01 X9 Z-44G40N80G26G96 V200 T0101 M04G92 S2000 sharizan/CNC Turning TNA300 34 17
  • 18. 10/17/2011 EXERCISE 1 sharizan/CNC Turning TNA300 35EXERCISE 2 EXERCISE 1 sharizan/CNC Turning TNA300 36 18
  • 19. 10/17/2011EXERCISE 3 sharizan/CNC Turning TNA300 37 19

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