T42 Zero Return/1006 Torque Limiter Issue
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  1. #1
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    Default T42 Zero Return/1006 Torque Limiter Issue

    I have a new to me Hardinge T42 lathe that I am having issues with the zero return procedure. I am hoping to get some help with an issue I am having.

    I am able to get the machine to move to the "stop on its own" position but when I hit X+ button to send it to the switch to set zero it stops immediately with a 1006 x/z lmtr/tlstk breakway. Looking in the parameters indicates a X axis fault. I jog the machine's x-axis until the bit goes from 0 to 1 indicating the clutch re-engagement. There is no audible clunk when it re-engages like the manual and the posts indicate there should be. Once cleared I can jog around a bit but when I go to set the x-limit I have the 1006 error again.

    It seems to be the clutch is not re-engaging or the switch is not functioning (possibly switch alignment). Thoughts on this? Trouble shooting procedures? I haven't tried the 2x4 as that was specifically called out in the manual for the Z axis.

    As far as I can tell the machine hasn't been crashed, or rather the x/z turret surfaces are in alignment (within .0005")

    I referenced this previous post as it seemed relevant.
    Hardinge T42SP Z torque limiter reset

    Matt

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    First off, w/o a PM, I wasn't going to see this thread in this board.
    I am sure that a few CNC questions pop up in here, but this board is mostly a manual machine board.


    Anyhow - what you are saying doesn't make sense to me...

    If it was tripped, I wouldn't expect it to start the HOME procedure, but apparently it is.

    Then you say that just by jogging X that you can git the param to change.
    What param specifically?
    Are you in 1815? (I'm guessing not if you have a HOMEing routine.

    I guess that since you seem to have a ghost, maybe the best place to start would be to pull back the way covers and get an eyeball on the clutch.
    Is it tripped? (may be hard to tell)
    Or maybe does it just have a little pc of schidt on it that the prox is picking up?
    Or maybe even just the prox got bumped somehow before you got it?
    (someone changed X axis thrusts just before puting it for sale?)

    You can manually trip it on porpoise.
    Use the block if you like - but just go push agginst the spindle, or maybe a 1.5" bar in the collet, or ???
    Just use the MPG to push on it.

    If it is already tripped, and you dial in slowly, you can (should) hear it pop in.
    However - if it is NOT already tripped, you will not only hear it, but will likely see the axis jump back a bit.
    You will then need to keep MPGing it down until you hear it latch in aggin.
    If you are handwheeling it too fast, you will blow right on through the clutch and re-trip it before you get stopped.
    It could be up to a full revolution (of the axis screw) before it trips back in aggin tho.

    After you go through that - if you tripped the clutch at all, you will likely need to tell the control to forget where it is.
    Turn off the power to the control. (not the whole case)
    Hold down the letter P and CAN keys, and boot up.
    Keep keys held down until it is all booted up.
    Then HOME it.

    Let me know outcome - I will now see this thread since I have replied to it now.


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

    Think Snow Eh!
    Ox

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    Thanks for the info Ox. Sorry if I put the thread in the wrong sub-forum. I thought this was the one for Hardinge lathe's like the T42. Is there a more appropriate location I should have this moved to?

    I am speaking of is the diagnostic parameter x10 Bit 3 (XTQLM). The maintenance manual describes to watch it while slowly rotating the MPG.

    After getting that (x10 bit 3) to reset from 0 to 1, I would trying the homeing procedure as described in the manual but I couldn't get past the step where I was to press zero reset and +x to move the axis to the home position. It would typically trip the 1006 alarm again. I haven't tried with the cancel and p trick, I will try that after I figure the clutch bit out.

    Couple questions on this, does it stop automatically at the home position during the re-home procedure? When is it necessary to re-home? After every 1006 trip error?

    I was in the process of removing the sheet metal around the x-axis (needs to be cleaned up anyway) and seeing if I could see if the sensor is out of alignment or maybe some chips got in there during transit . It looks like its up near the x axis motor.

    Just a note, I can only work on the lathe when I am out at the shop on the weekends so it will be a few days before I can test this.

    Thanks for the help!!

    Matt

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    You should easily be able to hear the clutch trip in/out, even in a noisy shop.
    If it is actually tripping easy enough not to make much noise, then maybe it needs replaced?


    If the machine needs HOMEd at all, it will need homed every time that you reboot the control.

    Yes, the axis should stop at the HOME position on it's own.


    Typically this thread would be in the "CNC" section.


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

    Think Snow Eh!
    Ox
    Last edited by Ox; 08-28-2019 at 08:44 AM. Reason: that you

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    Hi Matt, you are correct about the location of the torque limiter. You will need to remove the cover under the servo motor and the lube block package (a couple bolts and let it hang) to access the prox switch and see the torque limiter. I have had to replace the torque limiters as they do wear out as Ox said. It could also be run-out on the tripped torque limiter making and breaking the prox (X10.3). When this happens there is a clicking sound but it's not near as loud as when the limiter snaps back in unless the limiter is wore out. On x-axis you usually don't need the 2x4 due to the weight of the turret. It should snap back in when hand wheeling in the positive direction with the smallest increment selected.

    The Hardinge torque limiters only move out about .060" and they snap back in with a full revolution as suggested above. I also don't believe in ghosts.


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