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Using 12mm Linear Shaft and Bearings with V-Slot Extrusion

Discussion in 'Concepts and Ideas' started by Steve B, Feb 22, 2015.

  1. Steve B

    Steve B Veteran
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    I just wanted to report what I feel is excellent compatibility of the V-Slot with 12mm hardened linear shaft and bearings. I recently changed my lower axis on my CNC Jr. to use linear shaft instead of the wheels on the sides, because I feel that the arrangement with the wheels on the ends of my sliding table and leadscrew down the middle was not very stiff, it was also next to impossible to align sufficiently. I am keeping v-slot and wheels on my gantry and Z axis, I feel given the configuration they are plenty stiff.

    All the parts I bought are from Amazon, 12mm Linear Shaft (330 mm), 8 pack of linear bearings (only needed 4, but now I have spares) and 4 pack of shaft mounts. $40 total. I clamped the bearings to some V-Slot using some duct strapping. Mounting the bearings to the V-Slot lengthwise works great to keep the bearings aligned perfectly straight. Also, the bearings are 22mm in diameter, so they work out within 1mm of perfect spacing with the rest of the V-slot, note my sliding table is even with the 20x60 along the side of my supporting structure.

    I think for a sliding table, this configuration is far superior to using the wheels sideways underneath the table, or on the ends. It's extremely rigid.


    2015-02-22 16.29.03.jpg
     
    John Williams likes this.
  2. andrew

    andrew Journeyman
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    I like this, but I just don't feel great about using pipe strapping on a cnc machine. Sitting in the groove like that is awesome for alignment, but there should be a better way to fix it. It's a shame the block mounted variety (sc12uu) doesn’t match up to this extrusion.

    edit: If you're willing to step up to a 20mm shaft, there's a commonly available block with 40mm x 40mm mounting holes (sc20uu).
     
    #2 andrew, Feb 22, 2015
    Last edited: Feb 23, 2015
  3. Steve B

    Steve B Veteran
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    Yes, the pipe strapping seems a little hackish, but it worked great. I'll try to take a better pic, it doesn't look good, but works great. The strapping is tightened with screw in a way that it creates a ton of tension. There is still about 3mm left between the screw and v-slot, so there's more room to tighten if need. However, it doesn't have to be super tight, just enough not to slip. You could put a screw in the V-slot at the end of the bearing, if you really wanted to make sure it didn't slip. It's on the bottom, so no-one has to look at it. You could probably also use something like a conduit clamp.
     
  4. andrew

    andrew Journeyman
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    Yeah, you're right. I'm sure it works. I've been considering something similar so I'm just brainstorming.
     

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