Have an Omnitech router with oi fanuac controller. Fanuac servers. Using cv 9 for cad. Machine is 10 years old. We are starting to get parts that are randomly radiusing the four corners on parts. Not one particular part. Today we ran a program that was repeated over and over again for quantities. Some of the parts had the radius corners.

Just checking to see if someone has had similar problem.

In order to start to figure out the problem, You should find that program and post the code. Myself and about a thousand people out here know Fanuc G-gode. We can let you know if the code is causing the radii or if you need to look at the machine or if the CV settings for corners have changed. Can you tell if the radii are nice and consistent, or just sloppy looking possibly caused by backlash in the machine?

inside your machine tab,,locate "roll around corners" please reference photo,,,toggle this setting and should solve your issue..

Chev

View higher quality, full size image (1152 X 648)

Mike, here's the g code and a pic of the corners.
We ran this program, the rounding of the corners were very random, most were square, some were rounded.

Also Chevy, I checked the tabs and they were checked "NO". but thanks for the idea.

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O0001 (R640201N)
(CREATED ON 01 MAY 18 - 06:56)
(MATERIAL: 3/4 Hickory Mdf)
(LOAD: Material face UP)
G0 G20 G91 G28 Z0 M15
G90 G40 M22
M88 B0
M89 B0
G08 P1
M25
(ROUTE TOOL #11- 3/8 COMPRESSION)
(DIAMETER 0.374)
G0 G54 G90 X0. Y0.
T11
G0 G54 G90 X31.3735 Y25.9475 M13 S16000
G43 H11 Z1.75
G0 Z1.
G1 G42 D1 Y23.9375 Z-0.005 F100.
Y0.0005 F547.5
X46.9975
Y47.8745
X31.3735
Y23.9375
Y23.5635
G40 Y21.5535 Z1.
G0 Z1.75
X31.311 Y21.9275 Z1.75
Z1.
G1 G42 D1 Y23.9375 Z-0.005 F100.
Y47.8745 F547.5
X15.687
Y0.0005
X31.311
Y23.9375
Y24.3115
G40 Y26.3215 Z1.
G0 Z1.75
X15.6245 Y21.9275 Z1.75
Z1.
G1 G42 D1 Y23.9375 Z-0.005 F100.
Y47.8745 F547.5
X0.0005
Y0.0005
X15.6245
Y23.9375
Y24.3115
G40 Y26.3215 Z1.
G0 Z1.75
X15.6245 Y69.864 Z1.75
Z1.
G1 G42 D1 Y71.874 Z-0.005 F100.
Y95.811 F547.5
X0.0005
Y47.937
X15.6245
Y71.874
Y72.248
G40 Y74.258 Z1.
G0 Z1.75
X31.311 Y69.864 Z1.75
Z1.
G1 G42 D1 Y71.874 Z-0.005 F100.
Y95.811 F547.5
X15.687
Y47.937
X31.311
Y71.874
Y72.248
G40 Y74.258 Z1.
G0 Z1.75
X31.3735 Y73.884 Z1.75
Z1.
G1 G42 D1 Y71.874 Z-0.005 F100.
Y47.937 F547.5
X46.9975
Y95.811
X31.3735
Y71.874
Y71.5
G40 Y69.49 Z1.
G0 Z1.75
G80
M22
G91 G28 Z0 M15
G90 H0 M25
M88 B0
M89 B0
G91 G28
G90 X49. Y97.
M07
G08 P0
M30
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View higher quality, full size image (1778 X 2353)

Looks like a mechanical issue rather than a software issue to me.

check PID
and Jerk parameters if exists in yours controllers/driver

Yes. That's not looking like a radius corner, just a bad corner. Code shows straight corners, not roll around and look ahead is on. I would get a tech in to check the ball screws and or rack depending on the machine if you don't have maintenance in house.

Thanks for all the responses. Mechanical issue makes sense and will contact a technician.

Thanks again!

Are the roll around corners all in the same corner........that is in relation to one corner or another of the machine? Or are they random in location around the parts as well?

It does sound like a backlash issue to me as well.

BH Davis

I would agree that this looks like a mechanical issue. If you have belts that drive your long axis check them.

The random rounding is on all four corners. Rack and pinion with fanuac servors. I plan on having a technician come in and go over the machine.
Thanks again.

Jim,
You have rack and pinions on the Omnitech but many of them have a belt between the Fanuc Servo Motor and the gear box that sits in the rack. If yours is configured like this you may want to check both sides to make certain you don't have a broken belt. This is something I can help you with depending on your location.

Most rack and pinion machines you can power down and move the gantry by hand, may take some force. You'll know if one side is sticking for whatever reason. I've had issues where the bearing trucks gum up and don't move freely on the rails so essentially one side is always dragging behind and then finally jumps when it catches up.

again im almost sure its not rack & pinion problem
the corner are totaly 90 deg not round
so machine have no any move in previous axiss
its mater of wrong driver parameter ,the loop error wrong,controller not fix the correct position in any second

Update?

CV 9-

we had to slow our machine down for corner like what you show

we went to cv 11 after 11 kept shutting down on us in cad layers

anyway, give us an update

Thanks

If you purchased that machine new, you'll have free lifetime phone support provided by Anderson America on Omnitech Routers which have FANUC controllers. If you purchased it used, we have some alternatives for you to get expert help inexpensively.

Just from the picture, I would recommend that you verify that the part isn't moving on the table during that corner. If it was backlash or mechanical, it would usually (but not always) have the same "rounded" results on at least 2 corners, and often 4 corners.

Also, those older omnitechs had straight toothed rack and pinions that at this age would likely be worn or need replaced. It's not very expensive to do, but that is another likely culprit.

(704) 522-1823 techsupport@andersonamerica.com

Anderson America