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Designed and created this SFX100 Linear Bearing Sleeve mount

Discussion in 'DIY Motion Simulator Projects' started by Onii77, May 1, 2021.

  1. Onii77

    Onii77 New Member

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    My Motion Simulator:
    AC motor, 4DOF
    I designed and created this SFX100 Linear Bearing Sleeve mount to increase the throw of the SFX100. I had already extended the throw by getting longer hollow tubes, longer ball screw and profile (all 300 mm) but still wanted more travel, so I started from a scratch 100x100 block and countersunk the head of the linear sleeve bearing so that I could invert it.

    One thing that I need to account for is that now there is about 5mm too much throw and I will be making small shim to fit inside the profile so that the ball nut does not travel too far. if I had known this before, I would have added 5 mm to the slider, or taken 5mm off the profile. ahh well, live and learn

    My profile should get here next week and I'll be able to get it all together and try it out.

    Edit: Forgot to mention, this gives me about 185mm of travel.

    image (2).png image (3).png Image from iOS (1).jpg Image from iOS.jpg
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    Last edited: May 1, 2021
  2. Ads Master

    Ads Master

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  3. wannabeaflyer2

    wannabeaflyer2 Well-Known Member

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    Hi @Onii77 nice work , just had one thing to mention for you to take into account , if i understand your update it would appear that all the weight of the Platform and actuators will now be transmitted through the M8 threads in the 3D printed plate ..
    i would have a concern that this would be asking too much from these threads in this part as it stands , just my initial observation but i may have misssd some detail .
    this is not a critisism just my 2 cents worth as they say .. the weight and forces on these plates is very high especially when crashing LOL ... i do that a lot so ask me how i know :) good strong 3d prints are great when loaded correctly but threaded elelments are usually for location / Clamping in my view , Cheers
  4. Onii77

    Onii77 New Member

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    My Motion Simulator:
    AC motor, 4DOF

    Thank you for the kind words! When I get the profile early next week I will double check. I think I will be fine because the countersunk sleeve is actually on the inside, pressing on the profile itself, so there should be no pressure on the PLA threads, I will have to watch it in high angles, for shearing stress, but I believe that the M10s that are going through the mount will also apply pressure on the bearing to hold it against the profile, thus strengthening it.

    All that said, I do appreciate the critique/advice, it's got me thinking again about the forces involved!
  5. Onii77

    Onii77 New Member

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    My Motion Simulator:
    AC motor, 4DOF
    Also, attached is the STL exported from Fusion360. Note to anyone that would like to use it that you now need to be careful that you do not overcommit the ball screw.

    Now that the "body" of the linear bearing is no longer inside the profile, and instead points out, there is the possibility that you have too much throw now. That could inadvertently push the nut right off the end of the ball screw.

    In my case, with the extended throw "kit", I needed to prevent about 5mm of internal travel. I created a 5mm bumper (see screenshot, ignore the cable ties on the print bed, lol) to ensure that the slider could not overcommit. A better solution would be to extend the slider by the 5mm, but I had just printed all my sliders before I decided to design the above, so will try this out.

    upload_2021-5-1_13-12-56.png

    Attached Files:

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  6. wannabeaflyer2

    wannabeaflyer2 Well-Known Member

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    Hi @Onii77 Aha the missing piece of info for me LOL :) now i undesrstand the Postion of the Linear Bearing is supported on the extrusion so lees / No real load on the Thread ..

    Definetly makes sense now , Welll done :) inmy design for the Internal slider i opted for just a Cross shapped slider which greatly reduced the length needed and reduced friction points within the Extrusion i would need to show you a copy of m CAD drawing for my SFX150 Actuator to make it clearer but Hey yopur design is good so on the basis of "if it aint broke , dont fix it" then your good to go :) keep up the good work, we all learn something new with each design itteration , nothing is set in stone and theirs always ways to improve ideas thats why this forum is so great in my eyes Cheers
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