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Sphinx Solidworks files & XL Build plan

Discussion in 'CNC Mills/Routers' started by Apothus, Apr 9, 2017.

  1. Apothus

    Apothus Well-Known
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    I have been making a start on a Sphinx build, I really like @Kyo's design but wanted to make it in the XL scale, somewhat because I already have some spare 1m C-Channel assemblies i can salvage from another build.

    As part of wrapping my head around the project and what is involved in the machine I built the assembly in solidworks, migrating Kyo's files into solidworks part files. I figured I would share them for anyone else using solidworks.

    The plates will be laser cut & then drilled & bored on a turret mill. Although I am looking at options to increase the X-Axis rigidity to mount a 2.2kW spindle. They are $40 more than the 1.5 and they have an er16 collet.

    [​IMG]
     

    Attached Files:

    W1ck3dM1nds, corpore and Kyo like this.
  2. Kyo

    Kyo Master
    Staff Member Resident Builder Builder

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    Looks great ! Thank you for sharing your files. I have been asked for Solidworks format and have been unable to provide as I do not have SW. I look forward to seeing your build :thumbsup:
     
  3. Apothus

    Apothus Well-Known
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    My pleasure, I'll throw some dimensioned drawings up soon as well.

    This was my thought for increasing the rigidity of the X-axis. Essentially two C-Channels back to back and bolted every 100mm along their length. I also extended the front set of v wheels to try and move them infront of the center of mass a little more. Naturally a bit of travel cost but I should have plenty to start with.

    [​IMG]
     
  4. Kevon Ritter

    Kevon Ritter Veteran
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    The 2.2kW might be $40 more, but that's $40 wasted as it will probably exceed what the overall design of the machine can do, especially with a 1000mm wide gantry. After a certain point, extra cutting power is just bad weight to deal with, as it's now hanging away from the gantry. You have to look at how the machine moves. It uses v wheels which is more than likely going to be a much larger restriction that the spindle itself. You'll also probably need the max 425oz Nema 23 or possible bigger just to keep it from dropping. You also risk the possibility of sagging the c-beam itself.

    The linear rail and v wheel setup form openbuilds is pretty cool, but I wouldn't go that far with it.

    Edit: I just saw the last post. Nice mods! How much twisting resistance do you think a double C gantry would provide?
     
  5. Apothus

    Apothus Well-Known
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    TBH I dont have enough experience with the C-Rail to know how much of an improvement this will be. There is a temptation to try solidworks load modeling but its beyond my skill level for a complex assembly like this, there is just too many variables. The design also has the complication of needing a double width X carriage as well.

    I am tempted to build the larger plates so I can experiment with the additional rails. Maybe starting with a makita trimmer + some additional weights for testing then moving up to a 2.2kw spindle. It just seems a shame to shell out more money for a smaller router I hopefully wont need. Maybe I can borrow a mates :p
     
  6. Apothus

    Apothus Well-Known
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    The assembly certainly isnt light. With a 4kg spindle the entire carriage weighs 16kg!
    Not to mention the 80cm width of the two carriage plates & cost of 24 wheel sets. Although I think just the outside sets would be sufficient to start with.
    My plan is to bring the backlash nuts on the Y axis plates vertically inline with center of mass, I doubt it will make much difference but it may help eliminate any strange rocking behavior.

    [​IMG]


    I'll also make provisions for the X-Axis screw to run through the front channel and affix to the main adapter plate, reducing the likelihood of crabbing and rocking by having the driving force so far from the carriages center of mass. Just ignore the current alignment errors :p

    [​IMG]

    [​IMG]
     
  7. Kevon Ritter

    Kevon Ritter Veteran
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    It may not be a bad idea to add dual steppers for x. Those poor delrin nuts might wear down way too soon. One other possibility is to switch to a larger screw (lead or ball).
     
  8. corpore

    corpore Well-Known
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    ... very interesting, like the idea of of strengthening the x c-beam! If one could get a rail & pinion system to work on the double c-beam x axis, it could probably be extended even a bit more, allowing sequential work on rather large sheets of material, being pushed through.
     
    silopolis likes this.

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