[CMK1]

Hi Everyone.
I hope someone can help me here.

We have a Mori MV 40 with a Fanuc 10m (year approx 1987) and rigid tapping is enabled.
G84.2 calls up the rigid tapping but what happens is that the tap goes to the bottom of the hole ok then changes direction fine comes about half way out of the hole and then the spindle does something weird, it all happens pretty fast but it looks like it speeds up and then down again, the feed stays the same through the whole process.

As you can imagine it just pulls half of the threads on the way out.

I have had our local Fanuc Guru looking at it and he thought it was a parameter wrongly set, he was going to get a copy from another machine the same but he never came back.

I would be very thankful for any help anyone could offer here.

[underthetire]

See if you can get a video of it. I'm guessing it's a parameter on the spindle drive myself.

[CMK1]

Thanks for the reply

I should get this tomorrow.


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[CMK1]

Ok went in to work this morning and powered up the Mori and was met with "004 Overtravel LS Alarm" and the machine was also in an Emergency stop state.
I checked all of the obvious things like switches etc but i have now found that i dont have the 24NC voltage and for the life of me i cannot find where it comes from.
Can anyone point me in the correct direction so i can get on with fixing my origonal problem.

Thanks

[CMK1]

Hi Underthetire

I have taken a video but cant work out how to post it on here.
Under further investigations today we have found that when the tap is starting to retract the spindle seems to ramp up too far and then slows down to speed as it gets half way out of the hole.
I am guessing now that the spindle always starts like this but only noticeable when rigid tapping. It also seems to get more noticeable the higher the rpm

I have got the parameter settings that are currently in the spindle drive and they are as follows:

F1-1
F2-0
F3-0
F4-0
F5-2
F6-0
F7-100
F8-5
F9-0
F10-128
F11-128
F12-128
F13-210
F14-211
F15-80
F16-15
F17-18
F18-50
F19-10
F20-80
F21-20
F22-0
F23-60
F24-0
F25-60
F26-0
F27-60
F28-0
F29-131
F30-0
F31-1
F32-10
F33-10
F34-100
F35-75
F36-90
F37-0
F38-0
F39-0
F40-0
F41-64
F42-30
F43-24
F44-10
F45-8
F46-66
F47-8
F48-34
F49-25
F50-190
F51-0
F52-85
F53-15

[CMK1]

Bump


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[underthetire]

Put a youtube link..
Probably need to adjust ramp up parameters. Post the drive part number as well.

[CMK1]

Here you go

https://www.youtube.com/watch?v=myyfhasGB8g

Drive part number is A06B-6059-H212


Thanks

[underthetire]

Thats a weird one. C series drive looks like from the part number.
What i need to know, if this is a built in motor (integral) type or gear/belt drive spindle. I'm guessing that vintage it's probably a integral spindle. If so, i think the spindle encoder sensor needs to be adjusted.

[CMK1]

Yes you are correct it has got a integral spindle motor.
What is the procedure for setting the sensor.


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[underthetire]

Not sure if that one has the tooth sensor wheel on the spindle or not, but ideally you need the break out board and scope to do it. Check the wheel for damage, and set the gap with a matchbook cover. I know it doesn't sound very accurate, but metal on the sensor face is not good. Should be about .008". Also, see if you can borrow a handheld tachometer and check actual spindle RPM vs programmed. There is a setting on the drive to adjust if it's off.

[CMK1]

Ok the spindle does have a toothed wheel and a sensor, i checked the gap and it seemed a bit close so i removed it and found that at some time it had been rubbing (photo below) the yellow wire was also broken of its terminal so i soldered it back on and set the gap to what you specified and tried the tapping cycle again but got the same issue.
On the video above i had run at 1000rpm as the faster you go the problem is more pronounced, when i change to 1500rpm i get a SV032 LSI OVERFLOW (SPINDLE) alarm when it goes to start the tapping cycle if i then change the speed to 2000rpm i get a 452 SPINDLE STOP SIGNAL OFF alarm also when it starts the tapping cycle.

I have checked the speed with a tachometer at 500rpm and the physical speed is 498rpm so not far away.


Attachment 203094

[underthetire]

Ive seen worse. The LSI alarm overflow makes me wonder if the LSI chip on the main board is going..that chip controls the axis count. Not sure on this one.

[CMK1]

No bother
Thanks for your help so far.

[CMK1]

Bump

Can anyone else help me here.

[fordav11]

did it ever work properly? if yes something has changed electronically. the rubbing on the wire and the break is not good. possibly that shorted something on the circuit board where the wire connects at the other end and has damaged one or more IC's. you'll probably need to call Fanuc service if you need it fixed. otherwise use standard tapping mode and a floating tapping adapter.

[CMK1]

Thanks fordav11
It has never worked in our time but the machine is 1987 and we have it approx 10 years so it may have worked previously.
At the moment we are using a floating adapter but it is not ideal for some of the jobs we do.


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