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C-Beam Prefab Untitled

Discussion in 'CNC Mills/Routers' started by ahayden, Sep 24, 2016.

  1. ahayden

    ahayden Journeyman
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    ahayden published a new build:

    Read more about this build...
     
    TerryOx, snokid and Joe Santarsiero like this.
  2. MaryD

    MaryD OpenBuilds Team
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    Nice design
     
  3. TerryOx

    TerryOx Veteran
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    Bigger is sometimes better. There might also be interest in a larger format CNC machine that can easily be converted to an intermediate size, using the same rails but with adjustable plates that can effectively "choke up" on the rails to produce a machine with greater accuracy and repeatability. Rather than using plates screwed to the ends of the rails, it would use sliding plates on the sides of the rails, that could set the effective machine size to slightly greater than the planned project size. Maybe it already exists.
     
    #3 TerryOx, Sep 25, 2016
    Last edited: Sep 25, 2016
  4. ahayden

    ahayden Journeyman
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    @TerryOx Having some scalability to improve accuracy for smaller high tolerance parts definitely drove a lot of design decisions. I'm hoping this setup will provide enough rigidity, though admittedly modular joints have a tendency to introduce more error than their fixed counterparts. I haven't seen any designs yet that would be able to easily scale x,y and z travel. Please let me know if I'm overlooking any.
     
  5. TerryOx

    TerryOx Veteran
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    I do appreciate some of the advantages of your design. My build of the C-Beam XL is in the early stages, and I tend to do things very slowly and deliberately.
     
  6. JordanMoss

    JordanMoss Well-Known
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    Nice design. I am currently building something almost exactly the same.

    Have you thought about supporting the X axis gantry with a custom shaped plate (like the OX) rather than the vertical rail sections?
     
  7. ahayden

    ahayden Journeyman
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    @JordanMoss I looked into that and I have a few vector files drawn up for plates that accommodate 4 wheel sets along the top and bottom in addition to 4 more mini wheels running in the C-Beam track. Currently I don't have direct access to a CNC Router that can easily cut aluminum.

    For this build I'm more interested in a design that offers flexibility, in this current iteration I can lower the X axis gantry which will provide more rigidity to the Z axis. I can also shorten the X axis without cutting my lead screw or C-Beam.
     
  8. Bad Sequel

    Bad Sequel Veteran
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    Liking the looks of this!
     
  9. Mark Carew

    Mark Carew OpenBuilds Team
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  10. Darrell Corpening

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    Can you explain further what you mean by "admittedly modular joints have a tendency to introduce more error than their fixed counterparts"?
    And another question - which of the Openbuilds plates did you use for the two Y-movement beams with?
     
  11. ahayden

    ahayden Journeyman
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    @Darrell Corpening gantry routers have a gantry that runs along the y axis which is then connects to a carriage that runs along the x axis and z axis. This allows the cutting volume of the router to be maximized however with each axis connected in series the error/deflections compounds. This is added to the fact that in the carriages and gantry need to be kept to a reasonable size. A heavier gantry means actuator rails need to be stiffened to support more weight and stepper motors need more power to drive the axises. Travel speeds then are reduced to make up for increased inertia. Because of this XY tables are designed to have a smaller cutting envelope and to move at slower speeds. The x and y move independently of the z axis dividing the mass of moving parts and allowing for greater accuracy and larger more powerful spindles to be used. This is essentially the difference between the design of a 3 axis CNC router and a 3 axis CNC mill.

    The C-beam XL is somewhat of a hybrid xy table where the table only moves the y axis and the fixed gantry runs a carriage that navigates the x and z axis'. The dual y actuators are are linked by the table which provides a much more rigid connection than a moving gantry counterpart.

    If anyone else has any input on this feel free to jump in. I'm sure there's probably another thread out there that dives a little deeper into the pros and cons.
     
    jamesdjadams and AnassL like this.
  12. Jestah

    Jestah Veteran
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    Really nice design that looks like it is going to perform very well! thanks for sharing!
     
  13. Dale Y

    Dale Y Journeyman
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    Nice and simple. I am new to this and have just started planning one of my own, which oddly enough is similar. Now I see this and it gives me some ideas on how to finish my design
     
  14. Darrell Corpening

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    I love the simplicity of this design. And it could easily be scaled to any reasonable size.

    Looks like you are using standard Openbuilds plates rather than custom plates. Which Openbuilds plates are you using on the Y and X axis?
     
  15. Darrell Corpening

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    Looks to me that you have used a total of 6 XL Gantry Plates. Is that right?
     
  16. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    7 XL plates. There are 2 plates back to back between the X and Z axes.
     
  17. Jesus Obezo

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    Perhaps you could offer options of the 500 mm rails in either direction for those of us that need the space saving.
     
  18. MWB

    MWB New
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    This is the design I am going with. Makes sense and is a efficient use of existing parts for those of us that cannot currently fabricate aluminum parts for plates. I would like to go with a 1500 mm by 750 mm size (approx.) Do you see any issues with this length of C Beam as well as lead screw?
     

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