c axis milling program

[goaler]

hello members
i.m new to this site
i have an okuma captain L370 lathe and am trying to mill
a hex on the end of a shaft. the hex comes to a shoulder and
i am able to produce the hex but the flats appear rounded or
it looks like maybe the corners may be milled away a bit causing
the flats to look rounded.
i have milled a bigger hex on an other part using the same program
but this time it doesn't appear that i have the feed rate figured right
or maybe i need to use a different programing method.
any example programs or easy methods of calculating the feed would be helpful. i'm running a 1inch 3insert cutter milling a hex in stainless steel that is .830 across
the flats and .930 across the corners .340 deep
i'm running 2600rpm and feeding f18
any thoughts or advice
thanks in advance

[OkumaWiz]

What does your code look like? Are you using G101 with tool comp? If yes,
you may have your nose comp wrong which gives your flats a concave or convex surface depending on your comp value direction error. If I'm not understanding your description, then you may have your turning tool clipping the sharp corners thus rounding them out.

Your code, comp values would be helpful.

Your feedrate will need to be calculated using the formula in your programming book for "C" milling. (yes I too really wish the Okuma control would calculate this for you automatically - isn't that what a computer is for?!)

Best regards,

[CNCRim]

hard to help with out see your program code and from what you said I think you have the end line up with the piece and that's why the piece have corner, but we need to take a look at your program.

[MCR-B II]

I think Okumawiz is right. It is R comp problem.

[goaler]

hello thanks for your previous response
i am just starting to learn the milling function on this okuma
i have live tooling for side and face milling
i was using no comp on the previous job which was a bigger hex head
so i wasn't using any tool comp on this job
but this time on the smaller hex head the corners are rounded off
leaving the convex flat
can changes be made in the tool offset area x z t values
or must they be made elsewhere
but here's the program

NSTRT

G90
G95
G50
M5

/(FACE & RUFF TURN SMRAD TRIGON)
G0X20Z3
G50S2500
T010101M8
G97S1505M3M42
G18
/G0X1.6Z0.100
G0X1.100Z.100(BLT VRT LINK)
G1Z0.0F.010
X-0.031F.004
G0Z0.055
X0.935(BLT VERT LINK)
G1Z-.335F.008
X1.100
G0Z.100
G0Z1.00M9
M5
G0X20Z3
T0100
M1
/(NOV 26,2009 OKUMA)
/(MILL 6 FLATS HEX)
G090G95G50
M157
M5
/M1

N05
(1INCH END MILL)
G50 S4500T040404
G50 SB=3000(M TOOL MAXSPEED)
G0 X20 Z0.05 M5
/M146(C AXIS UNCLAMP CLOCKWIS)
M110(C AXIS JOINT)
M146M16(C AXIS UNCLAMP+DIR)
(START MILLING)
/G0X2.250 C30 T040404SB=1600M13
G0X0.940 C30 T040404 SB=2600 M13

G94 Z-0.109 F4
G101 C330 F20(2ND FLAT ROTAT 60)
C270
C210
C150
C90
C30

/G0X2.250 C30 T040404SB=1600M13
G0X0.940 C30 T040404 SB=2600 M13

G94 Z-0.218 F4
G101 C330 F20(2ND FLAT ROTAT 60)
C270
C210
C150
C90
C30

/G0X2.250 C30 T040404SB=1600M13
G0X0.940 C30 T040404 SB=2600 M13

G94 Z-0.327 F4
G101 C330 F20(2ND FLAT ROTAT 60)
C270
C210
C150
C90
C30

/G0X2.250 C30 T040404SB=1600M13
/G94 Z-0.328 F3
/G101 C330 F18(2ND FLAT ROT 60)
/C270
/C210
/C150
/C90
/C30

/G0X2.240 C30 T040404SB=1600M13
G0X0.940 C30 T040404 SB=1600 M13

G94Z-0.083F4
G101 C330 F8(2ND FLAT ROTAT 60)
C270
C210
C150
C90
C30

/G0X2.240 C30 T040404SB=1600M13
G0X0.940 C30 T040404 SB=1600 M13

G94 Z-0.166 F4
G101 C330 F8(2ND FLAT ROTAT 60)
C270
C210
C150
C90
C30

/G0X2.240 C30 T040404SB=1600M13
G0X0.940 C30 T040404 SB=1600 M13

G94 Z-0.249 F4
G101 C330 F8(2ND FLAT ROTAT 60)
C270
C210
C150
C90
C30

/G0X2.2400 C30 T040404SB=1600M13
G0X0.940 C30 T040404 SB=1600 M13

G94 Z-0.332 F3
G101 C330 F8(2ND FLAT ROTAT 60)
C270
C210
C150
C90
C30


M12(STOP SPINDLE)
G0X20Z0.05
M146(C AXIS UNCLAMP CLOCKWIS)
M109(CANCELS M110 AXIS JOINT)
G95(RETURN 2 FEED/REVOLUTION)
T0400M9
M2
%
thanks in advance

[CNCRim]

This is the link you are looking for check it out.

http://www.et.byu.edu/groups/mfg230c...de_blocks.htm#

[goaler]

yeah thanks i have that link