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Lead CNC 1510 modified

Discussion in 'CNC Mills/Routers' started by Marco964, Nov 6, 2019.

  1. Marco964

    Marco964 New
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    Marco964 published a new build:

    Read more about this build...
     
  2. Mark Carew

    Mark Carew OpenBuilds Team
    Staff Member Moderator Project Maker Builder Resident Builder

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    Great looking Build @Marco964 Are the lead screws put under compression or tension. I ask because of the whip that could be generated at the 1500mm length.
    Thank you for sharing brother!
     
    Peter Van Der Walt likes this.
  3. Marco964

    Marco964 New
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    Hi Mark. There is no compression but only a slightly tension to avoid the whip of the lead screws. Furthermore the two nut block mounted over the gantry, prevents this from occurring.
    Thanks a lot.
     
    Mark Carew likes this.
  4. Batcrave

    Batcrave Journeyman
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    There've been a number of discussions on here about the potential & potential problems of mounting one of those massive 1.5kW 80mm spindles on the Lead, but you're the first one I've seen actually try it on a full-size machine.

    I've got one on mine too, but due to space constraints I only have a half-width gantry. I keep thinking about expanding my machine to full-width, but every time the topic comes up, someone (sometimes me) brings up oft-repeated but little-tested theoretical concerns about the longer beam bending/sagging/twisting from the weight.

    How has it been working out for you? Have you had any trouble, or had to make any gantry modifications to compensate for it? Or have I (or we?) been worrying about nothing?


    -Bats
    (also, your electronics look fantastic... now I can't even look at my wiring without wincing)
     
  5. Rick 2.0

    Rick 2.0 OpenBuilds Team
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  6. Batcrave

    Batcrave Journeyman
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    Oooo... I've been drooling over the High Z mod anyhow, but it didn't occur to me (recently) that it would make the gantry twice(ish) as sturdy at the same time.

    Of course, then you get into the leverage/momentum question - when happens when you run a 10lb spindle up the High-Z's flagpole and then send the gantry G0'ing home like a bat out of metaphors?

    Although, I've already wasted the past week trying to chase down some intermittent stalls that I think are feed rate/acceleration-related (maybe... unless they aren't. this will probably need a thread of its own if it doesn't clear up in the next couple days), so maybe I should consider slowing down anyhow.


    -Bats...
    (...out of heck? ...out of patience? ...out of liquor? ...out of not-yet-snapped-endmills?)
     
    Peter Van Der Walt likes this.
  7. Marco964

    Marco964 New
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    Hello Bats. Thanks for your interest in my project.
    I must tell you sincerely that at the moment I did not find any particular problems but just to avoid them, I tried to reinforce the whole structure, doubling the number of wheels and putting double supports for the screws, to avoid unwanted oscillations. In this way the structure is very robust and perfectly supports the weight of the engine which is around 7Kg. If you need further information, do not hesitate to contact me.
    Regards.

    Marco
     
    Batcrave likes this.
  8. Marco964

    Marco964 New
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    attached a video showing the lack of oscillations on the y and x axis
     

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