QT-15 Turret Skipping Tools
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  1. #1
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    Question QT-15 Turret Skipping Tools

    We've recently bought a 1990 QT-15N T32-2, turning center and it's been running pretty good for its age. One of the issues that we've been having is that the turret skips stations when it's cold. Say its at tool 1 and you push the manual index button to go to 2, it might skip right past 2 and land at 3. It does it equally in either direction and it will also do it in auto mode while cutting a part. I've adjusted the encoder in the turret so that it is in the middle of the range where the light is on when tool 1 is up and it makes no difference. Also cleaned things up in there while I had the cover off. It is really bad when the machine is first turned on and you're setting up a job. It might skip on the first couple of parts in auto, then all of a sudden it quits doing it and runs parts just fine. Won't do it again until the machine is turned off and it sits overnight.

    I'm not sure if the encoder is bad, or if it's something else. It always displays the correct tool for where the turret is. If it tries to bring up tool 8 and lands at 9, it displays tool 9 and it knows it messed up. In auto mode, it will just sit there. Sometimes it throws an error, but most of the time it just sits there and you have to shut the control off and restart it. This machine has the 12 tool turret.

    I hate to throw an $800 encoder at it if it's more simply a sticky solenoid valve or relay or something.

    Anyone have any thoughts? Thanks in advance.

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    More likely a dirty/worn hydraulic index motor
    There is a shot pin in that thing that will miss which let's it get by a station.
    Do an MDI tool change first thing asking for a one station move. If it hicks and then goes all the way around and hits the second try your encoder is fine

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  4. #3
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    I like what you're telling me. I just can't see it being the encoder. But, I don't have a clue about how to run the thing in MDI mode. I'm going to need a little direction on that...

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    Just right a little manual program
    Some of the older mazaks have a test mode not sure about yours
    As far as how to write a manual program I'm afraid that's for the button pushers and over my head

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    I know nothing about that vintage of machine, but for clarity sake.....

    When its at Tool 1 and you press the tool change button and it skips from T1 to T3, does the machine acknowledge that its at tool 3, and not Tool 2?

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    Quote Originally Posted by J&H View Post
    It always displays the correct tool for where the turret is. If it tries to bring up tool 8 and lands at 9, it displays tool 9 and it knows it messed up.
    Encoder is fine.

    Quote Originally Posted by wippin' boy View Post
    There is a shot pin in that thing that will miss which let's it get by a station.
    There's your answer ^^^.

    Machine needs shot pin assembly in turret cleaned up. No $800 required, just some time and elbow grease.

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    I've a similar machine and it does the same thing on initial startup in very cold weather.
    I always thought it was the hydraulic oil temp being too low and that if I got a heater for the oil tank it wouldn't be an issue.
    Might look into the pin next winter.

    ....or get a building that holds the heat !

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    So, where is this shot pin? Do I start by removing the face of the turret or is it something that I can get to from the backside? Are there any wearable parts that I should have on hand before digging into it?

    Thanks for the replies so far.

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    Quote Originally Posted by Bobw View Post
    I know nothing about that vintage of machine, but for clarity sake.....

    When its at Tool 1 and you press the tool change button and it skips from T1 to T3, does the machine acknowledge that its at tool 3, and not Tool 2?
    Yes, if it skips tool 2, it shows that its at tool 3 like it really is. So far, this has kept it from doing anything destructive.

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    the shot pin I'm talking about is inside the "Nippon hydraulic index motor"
    I have not been inside the motor, I am parroting what I have been told by the guy at

    Hydraulic components
    262-549-1760
    in Wisconsin
    the name was joe 20 years ago but not sure now

    I pulled the unit and sent it to them
    it may or may not be "guy whats handy with tools" kinda repair, I'm not sure

    an oil change and an inline filter might be a start
    the guy told me one little piece of crud will do it

    the index motor is about the size of a toaster, you get at it from the back but the turret itself has to come out also I think

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    In my limited experience with a qt15n with t32b control from 1993 we battled this problem off and on for years with everything from turret out of balance to proximity switches out of adjustment to encoder out of adjustment to index motor. Our machine would work for 6 months then for a week or so skip stations and hang up then work fine for another six months. New proximity switches new hydraulic pump new index motor solenoids and all because that encoder must be working cause it keeps track of where the turret really is... Just change the encoder!! problem solved.

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    In my limited experience with a qt15n with t32b control from 1993 we battled this problem off and on for years with everything from turret out of balance to proximity switches out of adjustment to encoder out of adjustment to index motor. Our machine would work for 6 months then for a week or so skip stations and hang up then work fine for another six months. New proximity switches new hydraulic pump new index motor solenoids and all because that encoder must be working cause it keeps track of where the turret really is... Just change the encoder!! problem solved.
    ok then
    problem solved
    i'll go back to angry birds to pass the time

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    Quote Originally Posted by wippin' boy View Post
    ok then
    problem solved
    i'll go back to angry birds to pass the time
    No, no.... Problem NOT solved! Lol

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    Quote Originally Posted by wippin' boy View Post
    the shot pin I'm talking about is inside the "Nippon hydraulic index motor"
    I have not been inside the motor, I am parroting what I have been told by the guy at

    Hydraulic components
    262-549-1760
    in Wisconsin
    the name was joe 20 years ago but not sure now

    I pulled the unit and sent it to them
    it may or may not be "guy whats handy with tools" kinda repair, I'm not sure

    an oil change and an inline filter might be a start
    the guy told me one little piece of crud will do it

    the index motor is about the size of a toaster, you get at it from the back but the turret itself has to come out also I think
    I think maybe changing the oil and in inline filter might be the right place to start. It certainly won't hurt anything. Any recommendation on where to come up with an inle.filter like that?

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    > McMaster-Carr <

    I just hung mine off the cable festoon/hose hangy deal right inside the big back cover
    I'm no hydraulic expert but if there is some sort of flushing goo breaking product for a hydraulic system that would be good too
    a five minute warm up program on an old turd like ours never hurt either
    somethin' slow and steady to shake out the cobwebs in the morning

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    looks like some magic shit to me
    couldn't hurt

  22. #18
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    Update

    So, I dumped 2 quarts of Marvel Mystery Oil into the hydraulic oil tank. I have not changed oil or filter yet. Just added the MMO. After a few days of running, the turret all of a sudden just quit skipping tools all together. It's magically just working fine. I'm going to run it for just a bit longer, then change the hydraulic oil and filter and see if it lasts.

    Thanks for all the help and please keep your fingers crossed for me!

  23. #19
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    ya jinxed yourself now boy

    looks like I need to dump some of that seafoam stuff in my little qt20

  24. #20
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    I ended up going with the marvel mystery oil over the seafoam. It was cheaper and more available. Looks to be about the same thing. I think the largest portion of it is just mineral spirits anyway. At this point, I think I'd suggest it for any older machine that might be having some hydraulic issues.

    In fact, ever since we got the machine, we get a low hydraulic pressure error when we first start it up and that is happening less and less frequently. Like maybe that sensor was sticky and it's starting to free up a little.


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