[motordude]

Hello all,
I bought a new Doosan DNM400 last year, with Fanuc 0i-MC controller. It has now run 340 hours. At 140 hours this thing happened: I was running from a PMCIA card, milling waterline, hence the z value is constant, at that time it was, say 35 (can't remember exact value). The feedrate was 250mm/min. Suddenly the z value started to fluctuate between 34.xxx and 36.xxx. The values on the screen was 35. The feeding started to slow down and speed up from 120-600. I can't say if the X & Y moved wrongly, or if it was only the Z axis.
In other words, the program on the screen didn't take palce in the machine.
The part was damaged. When shutting the machine down and restarting the same program all was fine, no problems

I contacted my sales rep and the contacted Fanuc. They said that running from a non Fanuc memorycard may cause this problem. I got a Fanuc card and have been using it since. Now at 340 hours the same problem occurs, and is remedied by shutting down and restarting.

Has anybody experienced similar problems and found a cure for it?

Thanks!

[MysticMonkey]

Were there any fanuc alarms ?
What brought your attention to the problem (other than geometry of the wp)?

Probably a Fanuc issue, but. It would probably only be solved by changing quite a few NC/Servo boards and waiting to see if the error disapeared.

Also It would be better to post this problem in the Fanuc forum.

I assume your warranty has expired ?

[motordude]

Thanks for your reply,
there weren't any Fanuc alarms. I stood by the machine and observed as it was in the beginning of the program and wanted to see if all went well. After a short while into the program, the problem occured.

I did post this in the Fanuc forum, no replies unfortunately!

The machine is still under warranty, luckily, but I was hoping someone could tell me if they've had similar issues.