[johnpiero]

When I program our vertical mill to mill a 2" x 2" block with rounded corners I use one main program which calls 2 subprograms. 1 subprogram is for the rough-mill and the 2nd subprogram is for the finish-mill. Note that both subprograms are practically identical with the exception of a smaller compensation for the finish end-mill.
In an effort to simplify, i tried programming the G41 command within the main program so that I can use 1 subprogram for both the rough and finish end-mills. However, when i do so, the endmill doesn't travel where programmed for the first couple G1 and G2 commands, however it eventually follows the correct path.
Question, why doesn't the end-mill follow the correct path for the first couple movements?
Thank you in advance.

[Geof]

Show the program.

[dcoupar]

What kind of control?

[johnpiero]

So to machine the block with the Rough Mill with G41 in the main program, the main program looks like this (keep in mind this is a 2" x 2" piece with 1/2" Radii corners.

01111
G0 G40 G49 G80 G90
G92 X5.0 Y5.0
X-0.5 Y1.0 T1 M6
S3000 M3
G43 Z-1.0 H1
G1 G41 Y0.0 H17 F15.0
M98 P30001
G40 Y1.0
G92 X -6.5
G1 X-0.5
G1 G41 Y0.0 H18 F15.0
M98 P30001
G40 Y1.0
G92 X-6.5
M5
G0 G28 G49 Z0 H0
G28 G49 G91 X0 Y0
G90 M30

and the subprogram looks like this:
O0001
X-0.5 Y0.0
Z-0.5
G2 X0.0 Y-0.5 R0.5 F10.0
G1 Y-1.5
G2 X-0.5 Y-2.0 R0.5
G1 X-1.5
G2 X-2 Y-1.5 R0.5
G1 Y-0.5
G2 X-1.5 Y0 R0.5
G1 X-0.5
Y1.0
G92 G0 X2.5
M99

[Geof]

G1 G41 Y0.0 H18 F15.0

Change this so that you have both an X and a Y move and have the end of the move a short distance away from the first corner.

You will also have to change some moves ahead of this command.