Fadal CNC 88HS Z soft limit
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  1. #1
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    Default Fadal CNC 88HS Z soft limit

    From what I read, it appears if I try and restrict the max Z + travel by messing with soft limits, it will affect zero and tool change position??
    Is there a way to reduce Z max positive 1” without screwing up the Cold Start position?

    Thanks
    Keith


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    I'm interested in hearing this as well.

    You trying to avoid the roof?

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    Why would you mess with the limit?


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    It has to come up to clear the tools to rotate to the next tool
    Don


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    Already been said, but I'll say it again.

    If you limit the Z one inch lower, you won't even have to worry about tool changes,
    tools in the carousel won't fit under the spindle. Do a TC,1, there is maybe 3/8"
    of clearance from the pull stud to the spindle face.

    I'm assuming this is a ceiling clearance issue. If you don't want to or can't cut
    a hole in the ceiling, this is what I would do.

    Make a spacer and space the tool carousel down 1", then add a sheet metal strip
    to the "umbrella" so the tools are still shielded (as well as they can be).

    Then move your cold start position down 1". Should work fine, the only thing
    you would have to worry about is you could over travel going down, but that
    shouldn't be a big deal, I don't ever think I've hit the Z negative soft limit
    in my life.

    Another consideration on the 1". You may have to spin your resolver or encoder to
    get the carousel to line up with your spindle, or you could just make your drop
    a multiple of the lead screw pitch and not worry about it.

    This would also be quick and easy to remove and return the machine to factory
    configuration if you ever move to place with a respectable ceiling height, or
    sell it.

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    One more thought.

    The top of the spindle motor is just sheet metal that holds a fan, you might be able to
    gain your inch by modifying that.

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    I just cut a hole in the ceiling. You can’t limit the z and still have tool changes work.

    Then my next procedure was to build a shop with 12 foot ceilings.


    But seriously I would look at modifying the fans and cover on top of the spindle motor that still leaves the cable chain but were I’m going to school right now the haas machines actually have the cable chain just touch the ceiling a bit on full z pos. So that should be fine.

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    Default Fadal CNC 88HS Z soft limit

    Thanks for all the input. I already have a big hole for the cable chain. It’s the joist that’s in the way. I can certainly modify the fan filter , I was just researching options.

    Edit - deleted stupid comment I made, I was missing the big flick on clearing the other tools in the changer


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