Nakamura 0T and 6T Lathes X axis reversed

[Third-Gen]

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 pissed that X axis was negative away from part center. Any positive diameter was a X-. Well, for anyone else that has this issue and wants to change it, this is what I did. Im still working on the 6T control since I dont have a param manual for it, but for the 0T, this worked PERFECT!!!

Enable PWE

Diagnostics Page

ES142 is X axis direction
Its located at D514-2 so just change what ever yours is to the opposite. This will reverse the motion on the axis (so it is essentially backwards)

Go into servo settings, and change the X axis direction 111 or -111 to the opposite, this will correct the motion and the axis + or -

Now the issue is homing, it will home the wrong direction now

go into parameter #3, bit 0 is the x axis homing direction, change it to opposite what it is now.

restart the machine, rehome, and check your tool offsets.

Ill post up the 6T when i figure it out

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[Mike283]

Unfortunately the 6T is not quite as easy. This should help though.

1. Zero return X axis.
2. Change parameter 12 bit 0 (1 to 0/or 0 to 1).
3. Exchange the parameters between 143 and 147 but leave the signs. (143 is always positive, 147 is always negative value).
4. Change the sign on parameter 82, do not change the value.
5. Shut the machine off and swap motor wires on X axis servo (Switch XA1 and XA2)
6. Locate the Pulse coder on the end of the Ball screw, and switch wires on Pin A and B, also D and E in the connector housing, If you find the pulse coder in the Yellow cap, then skip next procedure(procedure 7).
7. Switch polarity on Tacho Generator on Pin A and B on the yellow cap.
8. Swap the Jog '+' and '-' by changing wires. (swap wires 576 and 577).
9. Restart the NC.
10. If you have FAPT and are using it, you must change the sign of MTF parameter 1050.

[Third-Gen]

Holy moly!! Didnt know the 6T was so involved. Im guessing youve done this before Mike283. I still have a ton to learn on this 6T. Its a lot different than the 0T. Calling a tool change wants to send the tool to X0 all the time. I gotta figure that out eventually.

[Third-Gen]

Mike I think I have the tool change stuff figured out, need to use a G50 with the tool change to move the coordinate system. Im gonna try to do the reverse this weekend, the X on the jog wheel is backwards too. No idea why Nakamura would have done this...weird.

[Third-Gen]

also what is a FAPT?

[Azmodi]

also what is a FAPT?

Fanuc Automatic Programming Tool. I have not used FAPT in over 15 years

[Mike283]

Mike I think I have the tool change stuff figured out, need to use a G50 with the tool change to move the coordinate system. Im gonna try to do the reverse this weekend, the X on the jog wheel is backwards too. No idea why Nakamura would have done this...weird.

This wasn’t just Nakamura. Some lathes were built X positive, some were built X negative. Don’t know why.

[Third-Gen]

Mike, ya its weird why they would do that. it messes up my I and K for arc vectors something terrible! its already hard enough to do the math sometimes as is. plus finding a post that works correctly is a pain.