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IndustryArena Forum > MetalWorking Machines > Okuma > please, a few questions about threading
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  1. #1
    Join Date
    Jun 2015
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    4131

    please, a few questions about threading

    hello all

    why does the spindle phase is depending on rpm ? how does the controller sync phase with z axis ? what is causing this floating zero ?

    what is so special about the option/special function that allows the phase to be always the same, regardless of rpm ? does it involve also hardware add-ons ?

    igf spits by default M22 M73 M32; how can i change it's defaults, for example M23 M74 M33 ?

    kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  2. #2
    Join Date
    Jun 2015
    Posts
    4131

    Re: please, a few questions about threading

    hello past self of myself as rpm changes, the linear axis needs to catch up, and it requires a safe-travel, during which to sync with the rpm

    during this travel, syncronicity is created, thus there is less sync at travel start, and sync is guaranteed at travel end; so, knowing this, is best to have syncronicity achieved before the tool starts to cut, thus clearance has to be long enough to allow syncronicity to occur

    as long as syncronicity is achieved before cutting, the thread will look just fine, and also is possible to cut a thread at different rpms, as long as clearance is long enough, and phase shifts are taken into account, but is not recomanded to change the rpm while in-cut, because the linear axis will try to catch up ( to match the new rpm ), and will mess the existing thread

    manuals provide the minimal travel, as a function of a machine specific constant and linear axis speed; for example, for s1234o/min and f1.5mm/o, the minimum delta is k*1234*1.5, where k is machine depentant, and there is a table that shows such values for some okuma machines

    but spindle acceleration times are not linear, and differs with gear, and so, also the k value presented in the manuals, is just an average; please check attached image, that plots k value as a function of linear axis speed

    once you have control over syncronocity, safe overides can be achieved, allowing to :
    ... thread at different rpms ( = okuma's variable spindle speed threading spec )
    ... chase treads, like roughing a thread somewhere else, then clamping it in the chuck, and finish ( = okuma's thread phase matching spec )

    in other words, there are alternatives to some special functions / kindly
    Attached Thumbnails Attached Thumbnails Untitled.png  
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

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