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IndustryArena Forum > MetalWorking Machines > Okuma > Multus B300W fiasco
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  1. #1
    Join Date
    Jan 2011
    Posts
    3

    Angry Okuma B400-W-----Undependable

    The Company I work for bought a Multus B400-W one month before I started working there. I went to training for the programming side of it and the operators got 2 weeks of training running it.
    Starting in Sept 09' we have had nothing but trouble with this machine, starting with Overheating servo's, Tool Changer jamming and throwing tools out of the arm, Constant Turret out of Alignment Problems "At least once a week" and using ADMAC never knowing what angle to compensate the 2nd spindle to time Front and Backsides of the part.
    Okuma from my past use to be a dependable machine, but NEVER AGAIN !!!
    We had our service rep out and said we were a unusual case.

  2. #2
    Join Date
    Jun 2008
    Posts
    372
    You need to add a tool cleaning cycle to the toolchange code

    I use M341, IGF can also use M341

    with

    OM341
    VS88=VMTTL
    IF [VTTLN[1] EQ VS88]NLP1
    G20 HP=4
    TC=01
    M8
    M869
    M263
    M175
    G04 F4
    M868
    M262
    M174
    M9
    NLP1 M321
    RTS

    As for ADMAC and the the 2 spindles. This is a machine setup issue not an ADMAC issue. This is controlled by a PARAMETER

    1st-2nd spindle
    No2 2nd spindle zero offset
    Or use VSYOF=?????

    I have not seen the problem that you speak off

  3. #3
    Join Date
    Jun 2005
    Posts
    142
    I agree, the spindles are timed by a parameter.
    I can't recall where exactly it's buried.
    Our Multus arrived having the No1 chuck jaws aligned and pointing down(C0), which was nice as we mill between both clamped chucks a lot.
    Our Macturn arrived with each chuck (C0) at some random position. We aligned them ourselves.

    I'm starting to think there is some very basic communication problem at Okuma HQ.
    And probably a basic ATC design flaw as well.
    I know Okuma have stated (several years ago!)that using a cleaning routine(M341) as part of the tool change cycle is a fix.
    Why the hell do people(customers) in Australia, Europe, North America etc have to find this information through peer groups like CNCZone!?
    Why isn't this made clear and set up ready to use, if needed, by the distributor?
    It only reduces the frequency of dropped or jammed tools anyway.
    Attached Thumbnails Attached Thumbnails DSC00234a.JPG  

  4. #4
    Join Date
    Jun 2008
    Posts
    372
    It comes down to machine setup, For some people the cycle time is everything for others machine running is everything.

    The M341 cleaning cycle was supplied by OCJ to the local distributer. Does your machine have this cleaning cycle?

    The toolchange arm spring problem can also be related to maintainance, How often do you clean the arm/Springs?

  5. #5
    Join Date
    Jan 2011
    Posts
    3
    How long have you worked for Okuma ?....budgieW

  6. #6
    Join Date
    Jun 2005
    Posts
    142
    For most people they want BOTH.
    Our machine uses the M341 NOW, after the problem has shown itself.
    I use it selectively on particular tools or material types, otherwise cycle times are too long.
    Cleaning springs on a machine a couple months old honestly did not occur to me at the time.
    We run an MA400H, six years old, and never had a problem with the ATC. Never had any preventative maintenance either.
    Buying the Multus was based on the reliability and solidity of that old MA.
    We have been less than impressed.
    Yes we bought a Macturn after the Multus, but it was the only hi-spec machine in Australia at the time and we could not wait for a Mazak or Mori Seiki or anyone else, to build/import one.
    It is a better machine than the Multus, because it is a (mostly) tried and true design.

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