[MoraTradgnist]

Hi!

I'm (maybe..) about to buy a Mori Seiki MV-40M -94, Fanuc OM-C, 10000 rpm option, 30 tool ATC option.

Is this a good machine? Are there any weak points to be aware of?
Can I do some 3D-milling or is the control too slow?
I know it's not an HSM machine but I guess it will do 3D-milling better than the old Mikron WF41C i use today..or?

Thanks in advance!

[MoraTradgnist]

Hi again,

I bought the machine and so far everything seems to work properly, except for the ATC arm.
The seller told me that it was dropping the tool during tool change from time to time and he was right..

Where should I start?

It's seems that the arm is not clamping the tool hard enough, it's only the heaviest tools that drops. The arm rotates quite fast and it's hard to see what really happens.

Is there some kind of springs for the "thumbs" in the ATC arm that can be worn?

I started the machine for the first time today and I have not been cutting anything yet. I don't want to put expensive tooling in the tool holders before I know that the ATC is 100% reliable...

[underthetire]

Yes, there are springs under the ATC arm thumbs, however, those lock and unlock depending on where the arm is. If it's randomly throwing heavy tools only, I would suspect the actual ATC arm claws on the end are bent/badly worn, at least one of them, or the Z height is off. Best thing to do is step through the ATC cycle with the custom/aux function.
Zero return Z
Custom/AUX button
ATC Manual
Spindle orient>exec
Pot down>exec
ATC arm FWD>exec>X+ button
You can just bump the X+ button, once the arm is off center you can push it by hand to the spindle, where it will get tight again.
continue till arm stops with x+ button
pot up>exec

[MoraTradgnist]

Thanks for the fast reply!

One of the claws was, as you said, bent. It helped a lot to straight it out but it still drops tools sometimes.

It seems like the arm is out of rotation alignment. If I stop the atc in the middle of the cycle and check how the tool is seated in the claw, it's obvious that the arm should rotate a little bit further before gripping the tool.

How do I adjust this?
The arm seems to be fitted on the shaft with a clamping ring. What happens if I remove the 8 bolts above the arm, does the arm fall down?

If I use a dial indicator, should the arm be parallel to the y-axis when it's in home pos.?

Sorry for the poor language, it's late and I'm tired....

/R

[coolhand03]

yes you can loosen those bolts to adjust the arm. loosen the bottom cup, but leave it in place to keep the arm from falling off once you knock it loose. it might take some good whacks to break it loose. i use a brass hammer. ive found the easiest way to adjust it is leave a tool holder in the arm as a reference. that way you can use the manual command to move it back and forth to see how it is placed in the spindle. if the arm starts to move up and the tool holder is still not perfectly underneath the spindle taper, just keep tapping it over until it is. the home position switch is up by the magazine. shouldnt need to mess with it at all.

[underthetire]

And please make sure you check both sides, if a claw was bent and straightened, you assuming the rest of the dimensions are still good on it. And be aware with alignments, if your off too far, it WILL break a cam bearing in the ATC unit. You don't want that!

[adanemelese]

Kind request for Mikron "wf41c" electrical wiring manual for TNC 155 control system