Help Please!   I cannot get this program  to run correctly.

 I am trying to mill a bore that is .750 in diameter by .125 deep using a 3/8" endmill.    The following program is how I would accomplish this using  my Haas mill.    When I run this in Mach 3 the  program runs   centerline of tool  ignoring the offset.    I have a tool diameter of .375 entered on the tool page on tool #1.   This  bore needs to be programed using cutter comp  becuase there are slight variations in the part that fits into the bore  and the easiest way to  adjust the bore for  the part fit is to adjust the cutter diameter.

Thanks,

 Scott


(test cutter comp- TAIG )
G17 G40 G49 G64 G80 G94
N1
T1 M06 (3/8"" 2 FLUTE HSS ENDMILL)
G90 G54 G00 X-1.000 Y1.000
S2900 M03
G43 H01 Z0.500 M08
G00 X0.000 Y0.000
G00 Z.100
G01 Z-.125 F12.0
G12   I0.200 K0.375 Q0.075 D01 F12.0
G00 Z1.000
G00Y0.000 X0.000
G00 Y1.000
G00 X-1.000
M30

You need to have G41/42's in the program. Also you need to have G40's to turn off comp

 I have  added a G42 command to the program and got some really strange simulations.   I  tried a  G42 command on the  X0.000  Y0.000 line as follows:  G42 G00 X0.000 Y 0.000 D01  and I also tried using it in the  G12  line as follows:  G12 G42 I.200 K.375 Q.075 D01   Both positions did not show an accurate toolpath.  I also had a G40 entered  at the second location of X0.000, Y0.000.


 

G12 should only have

G12 I.375 F12

No K, Q, or D
And you can't use compensation with G12, I don't believe.

And if you want to use G41/G42, you'll need a lead-in move inside your bore and need to use G2/G3.

   So from what I am getting mach 3 does not understand a G12 Command.   I need to milll out  a bore in a Pocket format  (G12) rather than  a circular interpolation (G02)  mode.  How would one go about doing this in mach 3  using  cutter comp?   I wish it were as easy in mach 3 as it is in my Haas Mini Mill!     I have tried all the programming formats I would use in the Mini Mill  as well as experimenting  with  I,J,and R  commands in G02  and G12 and so far I cannot get a complete  pocket.

Scott

Check out the G-codes in the manual. G12 in Mach3 is just a circle.

If you program with IJK's you can do a full circle... you can't do a full circle in R mode (No other program can because there is a math problem with doing that)