Cnc turning lecture6
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The document discusses coordinate systems and programming for CNC turning machines. It explains the basic G and M codes used to control machine functions like feed rate, spindle control, and tool changes. It provides examples of full programs for facing, roughing, and finishing processes. Sample code is given to demonstrate setting workpiece and tool offsets, constant surface speed, feed rate, spindle speed, and tool changes.
Cnc turning lecture6
- 1. 6/13/2012 AXIS CNC TURNING X TRAUB TNA 300 Z sharizan/CNC Turning TNA300 1 sharizan/CNC Turning TNA300 2 TURNING Coordinate system for CNC Turning machines MILLING sharizan/CNC Turning TNA300 3 sharizan/CNC Turning TNA300 4 1
- 2. 6/13/2012 MACHINE COMMAND G Instructions CODES G00 Straight line at the rapid traverse G code - Set preparatory machine G01 Straight line at the feed rate functions such as rapid traverse mode, G02 Circular arc, clockwise (right) feed mode and active tool length offsets. G03 Circular arc, counter clockwise (left) G26 Approach to tool changing ( Home) G40 Tools nose off M code - Perform a miscellaneous G46 Tools nose on machine function such as automatic tool G59 Zero point shift G71 Longitude roughing cycle changes, coolant control and spindle G92 Speed limitation operations. G96 Constant cutting speed sharizan/CNC Turning TNA300 5 sharizan/CNC Turning TNA300 6 M Instructions Program Block M00 Programmed stop M03 Spindle right (clockwise) M04 Spindle left ( counterclockwise) G01 X30 Z-20 F0.2 M05 Spindle stop M08 Coolant on G-Instruction Auxiliary conditions M09 Coolant off sharizan/CNC Turning TNA300 7 sharizan/CNC Turning TNA300 8 2
- 3. 6/13/2012 Step in programming Start Start – work piece zero point, cutting speed, tool, example spindle rotation, speed limit % Facing O 4546 Roughing process G59 X 0 Z___ Cutting G96 V___ T___ M___ Close - stop spindle, stop coolant, program stop G92 S___ M08 sharizan/CNC Turning TNA300 9 sharizan/CNC Turning TNA300 10 Start Start example Symbol example % Program number % O 4546 O 4546 Zero point shift G59 X 0 Z___ G59 X 0 Z___ G96 V___ T___ M___ G96 V___ T___ M___ G92 S___ M08 G92 S___ M08 sharizan/CNC Turning TNA300 11 sharizan/CNC Turning TNA300 12 3
- 4. 6/13/2012 G59 – zero point shift Start example G59 X 0 Z___ CALCULATE Z % Machine zero point spindle length = 150mm O 4546 Workpiece zero point + Work piece length = ______ + allowance = 10mm G59 X 0 Z___ Constant cutting speed TOTAL = ______ G96 V___ T___ M___ G92 S___ M08 sharizan/CNC Turning TNA300 13 sharizan/CNC Turning TNA300 14 Start G96 V___ T___ M___ example V ____ VELOCITY – by calculation or table % Tools O 4546 G59 X 0 Z___ T ____ No of Tools G96 V___ T___ M___ Spindle G92 S___ M08 rotation M____ Spindle rotation ( CW / CCW ) sharizan/CNC Turning TNA300 15 sharizan/CNC Turning TNA300 16 4
- 5. 6/13/2012 Start G92 S____M__ example S2000 SPEED LIMIT – calculation or table % Speed limit O 4546 G59 X 0 Z___ M08 Coolant on G96 V___ T___ M___ G92 S___ M08 Coolant on sharizan/CNC Turning TNA300 17 sharizan/CNC Turning TNA300 18 CLOSE PROGRAMMING TECHNIQUE example Using G code G26 Approach to tools changing (home) M05 M09 Spindle stop/Coolant off M00 Program stop % sharizan/CNC Turning TNA300 19 sharizan/CNC Turning TNA300 20 5
- 6. 6/13/2012 PROGRAMMING TECHNIQUE PROGRAMMING TECHNIQUE G0 X20 Z2 G1 X20 Z-15 F0.2 F - federate G2 X40 Z-25 R10 G1 X40 Z-40 G3 X60 Z-50 R10 G1 X60 Z-75 X = Diameter of work piece sharizan/CNC Turning TNA300 21 sharizan/CNC Turning TNA300 22 EXAMPLE 1 EXAMPLE 1- solution % O 652 X G59 X0 Z180 START G96 V200 T0202 M03 G92 S2000 M08 G00 X32 Z0 FACING G01 X-1 Z0 F0.2 G00 X26 Z2 G01 X26 Z-20 G00 X27 Z-20 Ø30 G00 X27 Z2 G00 X22 Z2 ROUGHING G01 X22 Z-20 G00 X23 Z-20 Ø19 G00 X23 Z2 Z G00 X19 Z2 G01 X19 Z-20 G00 X32 Z-20 15 20 G26 M5 M9 CLOSE M0 Unit : mm % sharizan/CNC Turning TNA300 23 sharizan/CNC Turning TNA300 24 6
- 7. 6/13/2012 EXAMPLE 2 - CUT EXAMPLE 2- solution % O 652 G96 V200 T0101 M04 X G59 X0 Z190 START G92 S2000 M08 G96 V200 T0202 M03 G00 X32 Z-36.5 G92 S2000 M08 G01 X26 G00 X32 Z0 G00 X27 FACING G01 X22 G01 X-1 Z0 F0.2 G00 X26 Z2 G00 X23 G01 X18 CUT G01 X26 Z-20 G00 X27 Z-20 G00 X19 Ø30 G01 X14 G00 X27 Z2 G00 X22 Z2 G00 X15 ROUGHING G01 X22 Z-20 G01 X10 G00 X23 Z-20 G00 X11 Ø19 G00 X23 Z2 G01 X6 G00 X19 Z2 G00 X7 Z G01 X2 G01 X19 Z-20 G00 X32 Z-20 G00 X3 15 20 G01 X0 G26 G26 M5 M9 CLOSE Unit : mm M0 % sharizan/CNC Turning TNA300 25 sharizan/CNC Turning TNA300 26 EXAMPLE 3 Using G71- Longitude roughing cycle Unit : mm X G71 P60 Q70 I0.2 K0.2 D2 F0.2 Ø35 Machining Machining allowance in Feedrate allowance in Ø30 Z-direction X-direction Depth of cut Ø22 Z Definition of finished 20 15 15 contour sharizan/CNC Turning TNA300 27 sharizan/CNC Turning TNA300 28 7
- 8. 6/13/2012 G71 EXAMPLE 3 - solution START PROGRAMMED % END PROGRAMMED X 0 5451 G59 X0 Z190 G26 Roughing cuts M05 M09 G96 V200 T0202 M03 M00 G92 S2000 M08 % End point finished FACING OBJECT contour “Q” Start point G00 X37 Z0 G01 X-1 Z0 F0.2 G00 X37 Z2 ROUGHING CYCLE K G71 P60 Q70 I0.02 K0.02 D1 F0.2 G26 SUB PROGRAMMED D N60 G46 G00 X0 Z0 G01 X22 Z0 G01 X22 Z-15 G01 X30 Z-15 Start point finished G01 X30 Z-30 contour “P” G01 X35 Z-30 I G40 N70 G26 Z sharizan/CNC Turning TNA300 29 sharizan/CNC Turning TNA300 30 EXAMPLE 4 EXAMPLE 4 - solution % O55 G00 X11 G59 X0 Z210 G01 X6 G96 V200 T0202 M03 G00 X7 G92 S2000 M08 G01 X2 G00 X20 Z0 G00 X3 G01 X-1 Z0 F0.2 G01 X0 G00 X20 Z0 G26 G71 P80 Q90 I0.2 K0.2 D2 F0.2 M5 M9 G26 M0 N80 % G46 G00 X0 Z0 G01 X4 Z0 G01 X4 Z-15 G02 X8 Z-20 R10 G01 X8 Z-35 G03 X-18 Z-45 R15 G01 X-18 Z-50 G40 N90 G26 G96 V200 T0101 M04 G92 S2000 M08 G00 X20 Z-51.5 G01 X14 G00 X15 G01 X10 sharizan/CNC Turning TNA300 31 sharizan/CNC Turning TNA300 32 8
- 9. 6/13/2012 DATA REQUIRED - bulb EXAMPLE 5- 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 sharizan/CNC Turning TNA300 34 % EXAMPLE 5 - solution EXERCISE 1 O041 G00 X21 Z-50.5 G59 X0 Z209 G01 X15 F0.5 G96 V200 T0202 M03 G00 X16 G92 S2000 M08 G01 X11 G00 X21 Z0 G00 X12 G01 X-1 Z0 F0.4 G01 X7 G00 X21 Z2 G00 X8 G71 P70 Q80 I0.2 K0.2 D1 F0.2 G01 X3 G26 G00 X4 N70 G01 X0 G46 G26 G00 X0 Z0 M05 M09 G03 X3 Z-1 R2 M00 G03 X19 Z-25 R38 % G03 X10 Z-35 R13.555 G01 X10 Z-45 G03 X8 Z-49 R6.9 G00 X12 Z-38 G01 X9 Z-38 G00 X12 Z-38 G00 X12 Z-41 G01 X9 Z-41 G00 X12 Z-41 G00 X12 Z-44 G01 X9 Z-44 G40 N80 G26 G96 V200 T0101 M04 G92 S2000 sharizan/CNC Turning TNA300 35 sharizan/CNC Turning TNA300 36 9
- 10. 6/13/2012 EXERCISE 2 EXERCISE 1 EXERCISE 3 sharizan/CNC Turning TNA300 37 sharizan/CNC Turning TNA300 38 10