Okuma LB15 w OSP 5000 Nose Radius Comp Help

Hi all,

New to this machine and needing help getting the nose radius comp setup correctly. Here's what I have:

OD turning tool with .031 rad

(in the NOSE - R COMP settings) X = .031, Z = .031, P = 2
(The screenshot doesn't show these settings. We entered them, got the error and then removed them)

With this code:

G50 S2500
G97 S1100 M42 M03 M08
G00 X1.85 Z0.1 T020202
G87 N0103
G82
G00 Z0
G01 X1.75 G41 F0.007
X0 F0.002
X1.441
G03 X1.501 Z-0.03 K-0.03
G01 Z-0.312
X1.625
Z0.6

I'm getting the following error:

"517 ALARM - B NOSE - R COMP NOSE-R > CIRLCE-R"

Also, the screen is super foggy. Does anyone know if this is a problem with the screen cover or the crt itself? (see pics)

Thanks in advance!

You need to use G42 for comp on an OD. With the G41 you're using it is cutting on the inside of the programmed profile. In other words, you're trying to cut inside a .030 radius with a .032 radius tool.

Plus its better get the X-step 2 time your nose radius.

I’m pretty sure that when you go from X1.75 Z0 to X0 Z0 and then back up to X1.441 Z0 it’s going to make the control shit the bed. Going down you will be on the Z+ side of the contour and going up you will be be on the Z- side ( inside the part!). I could be wrong though.

Change P 2, to P 3, exactly as you see in your first picture. Run your program in "Machine Lock" and see if it faults
Best of luck,
Chris

Well, for one thing, it looks like you're reversing your X direction in the middle of the cut. Can't do that with TNR comp.

johnryancnc said:

Hi all,

New to this machine and needing help getting the nose radius comp setup correctly. Here's what I have:

OD turning tool with .031 rad

(in the NOSE - R COMP settings) X = .031, Z = .031, P = 2
(The screenshot doesn't show these settings. We entered them, got the error and then removed them)

With this code:

G50 S2500
G97 S1100 M42 M03 M08
G00 X1.85 Z0.1 T020202
G87 N0103
G82
G00 Z0
G01 X1.75 G41 F0.007
X0 F0.002
X1.441
G03 X1.501 Z-0.03 K-0.03
G01 Z-0.312
X1.625
Z0.6

I'm getting the following error:

"517 ALARM - B NOSE - R COMP NOSE-R > CIRLCE-R"

Thanks in advance!

Click to expand...

Hello johnryancnc,
In your example code, it would be correct to use G41 to face the part as the tool would have to offset to the Left of the Tool Path, but when reversing the direction of X travel in the X0.0 to X1.441 move, the control will still offset the Tool to the Left in the direction of travel, which would be into the Workpiece. When reversing the direction of travel, the Tool Radius Comp would have to be changed from G41 to G42. Further, if the following code:

G01 X1.75 G41 F0.007
X0 F0.002
X1.441

actually worked without error, I believe a pip at the centre of the workpiece would result.

When facing a part where the face is perpendicular to the Z axis, there is no need to use Tool Radius Compensation and therefore, its common to face the part without using TRC and then turn it on when profiling the ID, or OD.

The same reason applies for the Z axis as stated above when changing direction in X. With your change of direction in Z in the Z0.6 move, the TRC would have to be reversed, or cancelled.

G50 S2500
G97 S1100 M42 M03 M08
G00 X1.85 Z0.1 T020202
G87 N0103
G82
G00 Z0
G01 X1.75 F0.007
G01 X-0.062 F0.002
G00 Z0.050
G42 X1.441
G01 Z0.0
G03 X1.501 Z-0.03 K-0.03
G01 Z-0.312
X1.625
Z0.6

Regards,

Bill