Fanuc 0T-C X Axis Homing Issue

[WakelessFoil]

Anyone who has worked with these older Nakamura turning centers knows of the odd trait that is the X axis direction. As you move closer to the spindle X is positive. I tried to change this by following the directions here:

Nakamura 0T and 6T Lathes X axis reversed

Hi all. I have 2 Nakamura lathes. One is a 0T control from 1995, TMC-15, and the other is a 1985 model Slant with 6T control. From day one I was always

www.cnczone.com

Well it didn't work. The machine still read the same way only now the machine would not perform a zero return in X and it was acting a bit erratically. I changed the parameters back and restarted the machine. Nothing changed and it is still acting odd. If I try to home the machine, it will home Z fine, but when I try to home X it just travels past zero until it triggers the limit switch. It will home itself if I execute a G28 in MDI but will not home in RPR. How might I fix this? Is it possible that switching one parameter may have altered others that I don't know about?

I tried calling Fanuc three times but the line is down.

Thanks,
Justin

 

[Ox]

"Acts erratic" just doesn't help us much.

Maybe you just O/T'd your axis and maybe your L/S was already on it's death bed, and now you need to change it?

I highly doubt that changing one param automagically changed others - that wouldn't have changed back as well.


I thought that was a Mori thing?
Old Nak's too eh?


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Think Snow Eh!
Ox

 

[Garwood]

Anyone who has worked with these older Nakamura turning centers knows of the odd trait that is the X axis direction. As you move closer to the spindle X is positive. I tried to change this by following the directions here:

Nakamura 0T and 6T Lathes X axis reversed

Hi all. I have 2 Nakamura lathes. One is a 0T control from 1995, TMC-15, and the other is a 1985 model Slant with 6T control. From day one I was always

www.cnczone.com

Well it didn't work. The machine still read the same way only now the machine would not perform a zero return in X and it was acting a bit erratically. I changed the parameters back and restarted the machine. Nothing changed and it is still acting odd. If I try to home the machine, it will home Z fine, but when I try to home X it just travels past zero until it triggers the limit switch. It will home itself if I execute a G28 in MDI but will not home in RPR. How might I fix this? Is it possible that switching one parameter may have altered others that I don't know about?

I tried calling Fanuc three times but the line is down.

Thanks,
Justin

Do you know how Fanuc parameters work? How you read them?

 

[Ox]

Think he switched the wrong one?

Either way - if he switched it back ....


---------------

Think Snow Eh!
Ox

 

[WakelessFoil]

Do you know how Fanuc parameters work? How you read them?

Yes I do. I do not know what every single parameter does (as I am sure most don't) but I know how to edit them. I changed them back and it did not go back to it's previous state.

 

[WakelessFoil]

"Acts erratic" just doesn't help us much.

Maybe you just O/T'd your axis and maybe your L/S was already on it's death bed, and now you need to change it?

I highly doubt that changing one param automagically changed others - that wouldn't have changed back as well.


I thought that was a Mori thing?
Old Nak's too eh?


--------------

Think Snow Eh!
Ox

"If I try to home the machine, it will home Z fine, but when I try to home X it just travels past zero until it triggers the limit switch."

I think the limit switch is fine because it still works in the same way. The stepper motor just doesn't stop at zero anymore.

Yes, I have no idea why they made them like that.

 

[Garwood]

Yes I do. I do not know what every single parameter does (as I am sure most don't) but I know how to edit them. I changed them back and it did not go back to it's previous state.

12345678

Which one is bit 3?

 

[Ox]

"If I try to home the machine, it will home Z fine, but when I try to home X it just travels past zero until it triggers the limit switch."

I think the limit switch is fine because it still works in the same way. The stepper motor just doesn't stop at zero anymore.

Yes, I have no idea why they made them like that.

Well, I hope that we aren't talking about anything with stepper motors!

There is a HOME L/S and then there is an O/T L/S. (in a row)
It sounds like it's not seeing your HOME switch.


--------------------

Think Snow Eh!
Ox

 

[WakelessFoil]

12345678

Which one is bit 3?

Bit 3 = 5 in that string.

 

[WakelessFoil]

Well, I hope that we aren't talking about anything with stepper motors!

There is a HOME L/S and then there is an O/T L/S. (in a row)
It sounds like it's not seeing your HOME switch.


--------------------

Think Snow Eh!
Ox

I see, well when I run a G28 in MDI it goes to zero no problem. I will call Fanuc on Monday and see if I can speak to Glenn. He has helped us solve very similar issues in the past with these older machines.

 

[WakelessFoil]

If anyone runs into this issue, try booting the machine holding "P" and "CANCEL", then try homing the machine. Problem solved!

 

[Ox]

Then you were not over-traveling, you were UNDER traveling.
Glad that you got it tho.


--------------------

Think Snow Eh!
Ox

 

[newcomer]

I had exactly the same problem as you before. Some parameters that require the machine to be turned off and on will reset the APZ bit on parameter 1815 or something like that which is causing the RTH issue.