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The C-Beam Sphinx 1x1

Discussion in 'CNC Mills/Routers' started by John Christian Lien, Jan 17, 2017.

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  1. John Christian Lien

    John Christian Lien Well-Known
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    Currently building a C-Beam Sphinx with a total size of 1m x 1m. I am following Kyo's sphinx build to the letter except when it comes to the height of the y-axis side plates.

    I took the original y-axis side plate files from Kyo's "rev 2 folder" to a freelancer and had him scale them up a bit. So they are now
    229mm x 155mm. Since i was going with taller plates i feared it would become more flexible, so instead of 6.3mm aluminium i went with 6mm steel.

    As i write this the plates are being cut at a local shop. Will update with pictures as soon as i get them.

    I have included the Y-Axis Side Plate (dxf) file in this post, free to download, just in case you want to go the same route.

    The picture below is my goal, except i will use a watercooled cnc spindle with a VFD.
    [​IMG]
     

    Attached Files:

    snokid and Kyo like this.
  2. Giarc

    Giarc Master
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    Maybe I am looking at this wrong, but with the plates that high, and the bottom of your Z even with the underside of the X plates will your spindle's end mills be able to reach down to your spoil board? Or will you mount yours with the Z plate attached to the X plate with the Cbeam going up and down so it can reach lower? Of course it could be the camera angle throwing me off. The reason I point this out, is I had a similar issue in my build. I built everything so at the lowest Z position, my standard end mills would reach the top of my spoil board plus a couple millimeters. I was able to get a 3.75" workable Z depth this way. However, when I wanted to drill a series of holes for mounting things to the spoil board I had to purchase extra long end mills. They work fine for drilling holes, but I have found them to have to much flex for accurate cutting. When I do multiple passes to cut through thicker materials I can see the depth lines. With my standard length end mills I don't see the "layers."
     
  3. John Christian Lien

    John Christian Lien Well-Known
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    Hi!

    I didnt notice that until you pointed it out now. I think the easiest fix is to have a "long" cnc spindle like on the picture below instead of a router, so that if you need to adjust the height you can just adjust the position of the spindle, instead of the whole z-axis. However it depends on how far it is between the bit and the spoilerboard it is though. i wouldnt have mine as far up as shown on the picture above.

    [​IMG]
     
  4. Giarc

    Giarc Master
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    One thing I have done to help eliminate some of the lever effect is to add an additional spoil board for when I am cutting sheet goods and aluminum. This is a smaller spoilboard and i have several made from scrap. When I cut 2 inch foam for a project, I removed the extra layer. This also helps keep me from having to replace the full size spoil board.
     

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