[thurminator]

I have a part coming up that has a .900 deep .154 diameter hole. It has a .0005 concentricity callout between 2 outside diameters. One of the dia is only .004 smaller than stock size. I always have problems with material swelling and putting conc. to .002-.006. I am using G821 to keep material as close to guide bushing as possible. Drilling is done first so that it is supported by guide bushing. Any tips for a good drill or method to help this? Cycle time is exrtremely critical. Thanks

[Ned-Dragon]

material is swelling-stretching:
turning to fast
drilling to fast - tool gets hot, do not make tools and material hot
--------------
concentricity:
check your bushing for run out. use test indicator.
try indicate of off sub, drills of off bushing it self.
use cutting oil Hard Cut 1854

ANY WAY TRY THIS.


T2200(DRILL)
G0Z-.05T22
G65P1212A.2B.1C.05Z1.W.01S-.05R-.05F.001D.3E2
G0Z-.05T0
play with feed rate, A, B, C,D, E
--------------
MICRO
$1
O1212
#140=#4001(SAVE-GO-G1)
#141=1(SET-DWELL-COUNTER)
IF[#7NE#0]GOTO1(CHECK-DWELL)
#7=0
N1IF[#24NE#0]GOTO105(CHECK-X)
IF[#26NE#0]GOTO5(CHECK-Z)
#3000=1(X OR Z IN COMMAND LINE MISSING)
N5(Z)
IF[#23NE#0]GOTO6(CHECK-W)
#3000=1(NO W ON COMMAND LINE)
N6#23=ABS[#23](MAKE+)
#139=1(SET PECK COUNTER)
#142=#19(142=Z POS EACH PECK)
N8G0Z[#142-#23]
#142=#142+#[#139](ADD ON EACH PECK #1-#2-#3-#3)
N10IF[#142LT#26]GOTO20(CHECK IF DONE)
#142=#26
GOTO100
N20G1Z#142F#9
G0Z#18
IF[#141NE#8]GOTO30
G4U#7
#141=0
N30#141=#141+1
IF[#139EQ3]GOTO8(NEVER GT 3)
#139=#139+1(COUNTER FOR #1-#2-#3)
GOTO8
N100G1Z#142F#9
G0Z#18
G#140
M99
N105(X)
IF[#21NE#0]GOTO106
#3000=1(NO U ON COMMAND LINE)
N106#21=ABS[#21]*2
#139=1
#142=#19
N108G0X[#142+#21]
#142=#142-[#[#139]*2]

N110IF[#142GT#24]GOTO120
#142=#24
GOTO200
N120G1X#142F#9
G0X#18
IF[#141NE#8]GOTO130
G4U#7
#141=0
N130#141=#141+1
IF[#139EQ3]GOTO108
#139=#139+1
GOTO108
N200G1X#142F#9
G0X#18
G#140
M99
(CALL BY)
(G65P8999A.15B.1C.05R-.05S.3Z1.5W.02F.001D1.E2.)
(G65P8999A.1B.075C.05R1.1S1.X0.U.02F2.D1.E2.)
(A=#1 FIRST PECK IN RAD.)
(B=#2 SECOND PECK IN RAD.)
(C=#3 THIRD AND ALL THE REST PECKS IN RAD.)
(R=#18 RETREAT POINT)
(S=#19 START POINT)
(Z=#26 X=#24 ENDING POINT)
(W=#23 U=#21 RAPID RETURN DISTANCE FROM LAST PECK IN RAD.)
(F=#9 FEED)
(D= #7 DWELL IF NOT THERE NO DWELL)
(E=#8 DWELL EVERY? PECKS)