DMU experts

[Columbo™]

We have a DMU-50

 

This does not happen all the time, but today even after a restart it happened three times in a row.

 

Program sends machine to C270. and B95. Machine goes to C270. and B94.98971 and goes into e-stop.

 

Any ideas???

 

service people have no clue....

 

Thanks

[Mr. Wizzard]

not a DMU guy, does the load meter spike while trying to rotate?

[Columbo™]

not a DMU guy, does the load meter spike while trying to rotate?

 

 

Nope, makes the rotation and the next Z move and then the alarm. (but B never got there 100%)

[Mic]

Heidenhain control?

 

Sounds like a problem with the position monitoring. I think there is a timer parameter or something similar that can be increased slightly to overcome the problem.

[Columbo™]

Heidenhain control?

 

Sounds like a problem with the position monitoring. I think there is a timer parameter or something similar that can be increased slightly to overcome the problem.

 

 

Yea....thanks, I'll get someone on it

 

 

[Aeroguy]

Sounds like you might be hitting a limit switch. Is your machine able to do negative axis?

[Columbo™]

No limit switch....it works most of the time, just recently it's been acting up. Been running the same parts for weeks.

[Mr. Wizzard]

I have nothing, sorry. Not being a DMU guy, just thinking something was getting hung up (chips, maybe crack in something) that would force a load and make the A stall out.

[dougm]

we had a similar problem with ours

the locks were not holding the B axis.

 

Doug

[Aeroguy]

Hmmm.. Well this could just be a shot in the dark, but maybe one of your driver boards is acting up. That used to happen to me at least every 6 months or so. I would probably suggest swapping the board with another axis and see if the alarm changes to that axis.

[K2csq7]

We had a similar issue on our Daewoo's, it was the timing of the lock for the rotary.

[chall]

Is it a dmu 50 evolution or the 3+2 version. We have 2 small dmu's and have had the bolts shear on the b axis clamps at least 4 times, one is currently down for this reason, and the machine is just over a year old. One thing to try that might keep you going is slow your feed down for the spatial/cycle 19 move. Do you get any errors at all? Or just the e stop?

[dougm]

Our 3+2 was just as chall said sheared the bolts twice

[Columbo™]

ours is a 3+2 also....

 

The machine goes to an e-stop

 

The wierd thing is the only time in the program it shuts down (and not all the time) is on the center drill. The drill later on never, as of yet had the problem.

[Mr. Wizzard]

If you have the time, can you program some incremental rotations back and forth and run in a loop to see if the problem happens in the same spot consistently? Just on the center drill is weird....

[Columbo™]

If you have the time, can you program some incremental rotations back and forth and run in a loop to see if the problem happens in the same spot consistently? Just on the center drill is weird....

 

 

WEIRD.......YES...very

 

Made a looping program and it ran fine. whent back to the production program.....same $hit...

 

Checked the program all is good.

 

Copied the drill and changed the cycle 83 to 81 and changed the drill depth for the center drill....e-stop AGAIN...

 

BTW.....this machine is past weird.

[Mr. Wizzard]

WOW, the things that happen to us.....

 

Are there any macros or settings being loaded, run by the program or canned drilling cycle within the control (in the background) that could be throwing a curve ball? Anyone (operator) mess with the machine parameters or settings?

[chall]

can u post that bit of the program up?

[Columbo™]

Goes down on line 860 (again, not all the time)

 

;(CENTER DRILL SECTION C-C - CLEVIS SIDE)

N830 S4278 M3

N840 G599 D1

N850 SUPA X-21.5 Y-.1

N860 CYCLE800(1,"DMG",0,27,0.,0.,0.,90.,0,95.,,,,1)

N870 G90 G0 X-1.25 Y1.0479

N880 Z5.

N890 F6.16

N900 MCALL CYCLE81(5.,-1.2237,.1,-1.47,)

N910 X-1.25 Y1.0479

N920 MCALL

N930 G0 SUPA D0 Z-.1

[Mr. Wizzard]

Did you jiggle the wires? Seriously, could be something dumb, like a bad plug, wire, connection at the drive. Just guessing.

[chall]

Did you jiggle the wires? Seriously, could be something dumb, like a bad plug, wire, connection at the drive. Just guessing.

 

this is also true, we have to give one of our other DMU's a "love tap" to get the screen to work when we switch it on.

[Columbo™]

WOW....gets even weirder.

 

Had to break down the job to run another hurry up job. No problems, lots of rotary moves.

 

After the reset-up of first job, back to the e-stop BS in the same spot. It took about a half a day completeing about 20 parts before the first e-stop alarm.

[Mr. Wizzard]

Well, that explains it. The machine doesn't want to run those parts. Problem solved. Don't run those parts on it.

 

Next time, hold up the print and ask first.

If you get a , move on.

[Columbo™]

^^ ^^

 

[Odin]

Had something similar happen on our makino 1210 b-axis. ended up being the scale for the b-axis. replaced it and all is well.