Hardinge CHNC turret valve permanent blowing


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Thread: Hardinge CHNC turret valve permanent blowing

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    ThiloD's Avatar
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    Default Hardinge CHNC turret valve permanent blowing

    Hallo
    I have just started my CHNC with an Allen Bradley Control
    It seems that everything is working fine just the Clippard Valve for the turret blows permanently thru a hole in the aluminum body. Is that normal?

    My compressor works hard to get enough air.

    If I turn the turret with the swith at the reader unit it turns perfect.
    I have unmounted the valve and there is no rubber seal between the aluminum body and the valve. Maybe the seal would close that bypass?

    Thanks for the help.
    Thilo



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    Default Re: Hardinge CHNC turret valve permanent blowing

    If you are referring to the Air Cushion / Bump Stop. That always leaks air. The CHNC is an air hog. And if you are running one with just a slight compressor system. The compressor will work hard to keep up. It is one of the negatives of this machine.

    Post a photo of what you are talking about and perhaps I can help you more.

    I remember way back when......
    We ran two 1995 CHNC3's with one 5HP 60 Gallon Compressor. You could go into the compressor room and grill steaks on the compressor's cylinder heads.
    With just a touch of motor oil Ajou sauce.

    JT



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    Default

    Thank you so much JT

    I am not able to post aphoto
    but it is like you mentioned. It is the Clippard valve for the turret steering.
    If the turret sits down after rotation it is blowing permanantly thru that bypass hole.

    I think I have to buy a new compressor.....

    Thilo



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    Finalyy I was able to post the photo

    The air is blowing even when the turret is in the down position


    Is that correct ?


    Thilo

    Quote Originally Posted by JohnnyTurn View Post
    If you are referring to the Air Cushion / Bump Stop. That always leaks air. The CHNC is an air hog. And if you are running one with just a slight compressor system. The compressor will work hard to keep up. It is one of the negatives of this machine.

    Post a photo of what you are talking about and perhaps I can help you more.

    I remember way back when......
    We ran two 1995 CHNC3's with one 5HP 60 Gallon Compressor. You could go into the compressor room and grill steaks on the compressor's cylinder heads.
    With just a touch of motor oil Ajou sauce.

    JT




  5. #5
    ThiloD's Avatar
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    Default

    Finalyy I was able to post the photo

    The air is blowing even when the turret is in the down position


    Is that correct ?


    Thilo

    Quote Originally Posted by JohnnyTurn View Post
    If you are referring to the Air Cushion / Bump Stop. That always leaks air. The CHNC is an air hog. And if you are running one with just a slight compressor system. The compressor will work hard to keep up. It is one of the negatives of this machine.

    Post a photo of what you are talking about and perhaps I can help you more.

    I remember way back when......
    We ran two 1995 CHNC3's with one 5HP 60 Gallon Compressor. You could go into the compressor room and grill steaks on the compressor's cylinder heads.
    With just a touch of motor oil Ajou sauce.

    JT




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    Default Re: Hardinge CHNC turret valve permanent blowing

    As JonnyTurn said, they are air hogs and were designed that way. They wanted to keep chips etc. out of the housings.

    When I first got mine years ago, it did not work at the time. I found a guy that had worked for Hardinge for over 20 years as a CHNC tech and even helped with the design and assembly. While waiting for him to come, I took the entire turret all apart to FIX that leak. Turned not to be bad, but had purchased the seals so did it anyway. Still leaked bad. When I talked to him, he confirmed that it was normal and nothing could be done.

    He was a great guy and is retired now, but recently gave me an old VCR tape called, "Everything you wanted to know about commissioning the 810 T control for the CHNC 1, but were afraid to ask." Seriously, that is the name of it. The man talks with a German accent in a slow monotone voice that will put you asleep in minutes, but it does some good info in it. I did a digital conversion to DVD for it and if you have a Siemens 810 T control, PM me and I'll send you a copy.

    Good luck and get a bigger compressor!

    Mike

    Two Haas VF-2's, Haas HA5C, Haas HRT-9, Hardinge CHNC 1, Bother HS-300 Wire EDM, BobCAD V23, BobCAD V28


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    Default Re: Hardinge CHNC turret valve permanent blowing

    You need that seal on the valve, it will leak, do not over tighten once you get a seal. Mine had minor air loss out the back of the valve and it worked ok, now I have a ton of air leaking out the rear of the buffer piston, like tons and the buffer is intermittent. I replaced all the X and O rings, still bleeding too much air. Seems to have made it worse.I need a buffer doctor.



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Hardinge CHNC turret valve permanent blowing
Hardinge CHNC turret valve permanent blowing