G83 Peck Cycle.

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Presentation transcript:

G83 Peck Cycle

Custom Drilling “Cycle”

ID Boring - spot drill - drill - rough bore - finish bore

ID Boring Example (SPOT DRILL) G00 T0505 G97 S1000 G99 G00 X0 Z[#501 + 2.0] M03 M08 G01 X0 Z[#501 - 2.0] F0.5 G01 X0 Z[#501 + 2.0] F2.0 M09 M05 G28 U0 W0 M01

ID Boring (cont) (ROUGH BORE) IF [#522 GE 19.0] GOTO 66 (#522 IS ID) M0 (ERROR - BORE SMALLER THAN TOOL) N66 G0 T0707 (19MM END MILL, TOOL 7) G50 S1000 (CLAMP AT 1000) G96 S#502 (CSS) G99 G00 X19.0 Z[#501 + 2.0] (START POINT) M3 M8 G71 U2.0 R0.5 (2MM DOC, 0.5MM RETRACT) G71 P20 Q25 U-0.7 W0.0 F#503 (NOTE -0.7 FOR U = INTERNAL) N20 G00 X#522 Z[#501 + 2.0] G01 X#522 Z[#501] F#504 G01 X#522 Z[#501 – 10.0] (10MM DEEP BORE) N25 G00 U-0.4 (MOVE DOWN 0.4MM OFF BORE) M9 M5 G28 U0 W0

ID Boring (cont) (FINISH BORING) G00 T0707 G50 S1200 G96 S#502 G99 G00 X12.7 Z[#501 + 2.0] M03 M08 G70 P20 Q25 G00 Z[#501 + 2.0] M09 M05 G28 U0 W0

Threading Cycle Threading requires multiple passes in perfect synchronization to reach final thread depth. Must make sure you are in constant spindle speed mode, not constant surface speed!

Computing Thread Parameters Overall thread height H = Pitch*(0.5 / tan 30deg) = 0.866025*Pitch Ext thread depth = (17/24)*H = 0.613435*Pitch Int thread depth = (5/8)*H = 0.541266*Pitch

Threading - G76

Threading - G76

G76 Pffppaa Qddd Rfff (first line of G76)‏ Threading - G76 G76 Pffppaa Qddd Rfff (first line of G76)‏ ff = # of finish passes (01-99)‏ pp = # revolutions for gradual pull-out (0.0- 9.9=00-99)‏ aa = angle (60 degrees for us)‏ ddd = last depth of cut (min.cutting depth) (positive radial value, no decimal point – microns)‏ fff = finish allowance (mm, dec.point allowed)‏

G76 Xxx Zzz Ppp Qqq Fff (2nd line)‏ Threading - G76 G76 Xxx Zzz Ppp Qqq Fff (2nd line)‏ xx = last thread pass diameter zz = Z endpoint of thread pp = height of thread (pos.radial value, microns)‏ qq = 1st threading pass depth (max.cutting depth, pos.radial value, microns)‏ ff = feedrate (same as thread lead)‏

Example: M24x2 external thread Threading - G76 Example: M24x2 external thread G00 X30.032 Z[#501 + 6.0] G76 P010060 Q005 R0.0 G76 X24.43 Z[#501-10.0] P1360 Q0544 F2.0

Multistart Threading Example: M24x2 three start external thread #1=2.0 (PITCH - MM)‏ #2=0.5/TAN[30.0] * #1 (H)‏ #3=#2 * 17.0/24.0 (THREAD DEPTH)‏ #4=3 (NUMBER OF STARTS)‏ #5=0 (START NUMBER)‏ G00 X32.0 Z[#501 + 3 * #1 * #4] (START 3X LEAD AWAY)‏ WHILE [#5 LT #4] DO 1 G00 X30.032 Z[#501 + #1 * #5 + 3 * #1 * #4] G76 P100060 Q005 R0.0 G76 X23.39 Z[#501-10.0] P[FIX[#3*1000]] Q0544 F[#1*#4] #5 = #5 + 1 END 1