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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:

    Fredrik KJolner, 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.
     
  5. John Christian Lien

    John Christian Lien Well-Known
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    Getting there.. Prefitted the Y-Axis.

    213667702.jpg 213670701.jpg
     
    Kyo likes this.
  6. John Christian Lien

    John Christian Lien Well-Known
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    The two videos here are just to show that i dont think this gantry is too long (some people think so). I dont think this gantry will flex.. The "measurement" between bottom of the gantry and table is bang on the 89 mark with and without load. It was the same directly under the z-axis as well, just didnt manage to shoot a video of it as i dont have a second set of hands right now.




     
  7. ChadRat6458

    ChadRat6458 Journeyman
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    What size spindle are you using?
     
  8. Kevon Ritter

    Kevon Ritter Veteran
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    The load isn't the weight of the spindle though. The load is the force as a result of cutting. None of which would be directly up or down unless you plan to plunge end mills.
     
  9. Nibar77

    Nibar77 New
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    Would you have a PDF file of the front plates, if not do you know who would...thanks
     

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