Turnbuckle Leg Adjusters

New Home Forum Mostly Printed CNC – MPCNC Your Builds – MPCNC Turnbuckle Leg Adjusters

This topic contains 9 replies, has 3 voices, and was last updated by Profile photo of geodave geodave 3 weeks, 3 days ago.

Viewing 10 posts - 1 through 10 (of 10 total)
  • Author
    Posts
  • #36607
    Profile photo of geodave
    geodave
    Participant

    I have been looking for an easier way to adjust the level of my corners & came across this idea: https://www.thingiverse.com/thing:953976 The problem was I wanted to use my same corner styles, so I set out to remix this in openscad. My biggest hurdle was getting the threading the way I wanted & found an openscad screw threads library that worked well for me at http://dkprojects.net/openscad-threads/ . I used a thread angle of 40 degrees since that printed a lot better than the default 30 degrees. With a Pitch of 4, turning the nut 1 revolution will raise or lower it 8mm (4mm below the nut & 4mm above). I was originally going to make this design the same way the original designer did, but then realized a turnbuckle would be fun. I had enough room inside the turnbuckle to add a 1/2″ EMT which should make it quite strong. I need to make a couple more small tweaks to the design, but I am pretty happy with how well this initial test went. I was tired of using index cards on my corners to get it level. I have an option to have the threads only at the top like the original design, just in case this does not work out. Here are some photos of what it looks like so far. There is also an image showing the variables that can be changed on the turnbuckle.

    1 user thanked author for this post.
    #36611
    Profile photo of Ryan
    Ryan
    Keymaster

    Sweet design!

    So far what are your impressions? Sturdy, any play in the threads after you tighten the locks?

    #36614
    Profile photo of Jeffeb3
    Jeffeb3
    Participant

    That’s neat. Is there a set screw in that hole, how does that work? I want to make that and then find a purpose for it.

    #36615
    Profile photo of geodave
    geodave
    Participant

    I tested the thread clearance with a .8, .4 & then .2. The clearance that worked best for me was .4. There is almost no play in the threads & when you tighten the bracket even just a little bit there is no play. That clearance is adjustable in openscad. I also took the liberty of remixing your Lock-CornerC in openscad to add the threads with an optional Height adjustment. 27mm might be too short to use with the threads.

    #36616
    Profile photo of geodave
    geodave
    Participant
    I tested the thread clearance with a .8, .4 & then .2. The clearance that worked best for me was .4. There is almost no play in the threads & when you tighten the bracket even just a little bit there is no play. That clearance is adjustable in openscad. I also took the liberty of remixing your Lock-CornerC in openscad to add the threads with an optional Height adjustment. 27mm might be too short to use with the threads.

    If you are talking about the horizontal hex hole in the middle of the nut, that is in case you want to adjust it using a 5mm allen wrench, screwdriver or whatever fits. If you add the 1/2″ EMT to center, you probably can not use that. My 32mm plastic wrench adjusts it pretty good so far. I was just thinking I could probably make something like a knurled socket open at the top & bottom & leave one on each of the turnbuckle. That way I could put some index marks around the circumference to get a better idea of how much it is going up or down.

    I showed this to a friend & he wanted me to print him one to use as a mini jack. I can see there are some good possibilities for using this idea for other purposes.

    #36676
    Profile photo of geodave
    geodave
    Participant

    I guess this is more accurately called a Jackscrew instead of a turnbuckle. https://en.wikipedia.org/wiki/Jackscrew

    Yesterday I remembered an M3 thumbwheel design which works pretty good on leveling my 3d printer corners, https://www.thingiverse.com/thing:844008 . I used his openscad file to create a 32mm thumbwheel & printing that now to see how well that will work. I included a screen shot of what that should look like. For the test version, I only used 4 index numbers instead of 8. I will use a black sharpie to highlight the numbers & main ticks.

    #36807
    Profile photo of geodave
    geodave
    Participant

    I published it today on thingiverse https://www.thingiverse.com/thing:2405370
    I do not have all the corners on yet, but looked good enough to go ahead & publish.

    #36912
    Profile photo of geodave
    geodave
    Participant

    Hope this is not too far off topic, but I am always looking for something fun to make. I ended up not using the thumbwheels but designed a thumbwheel spinning top. It is not the best spinning top out there, but was a good use of my left over thumbwheels. Here is a short video showing 2 test runs.

    https://www.thingiverse.com/thing:2407034

    #36913
    Profile photo of Ryan
    Ryan
    Keymaster

    Way more cool that a fidget spinner!

    #36923
    Profile photo of geodave
    geodave
    Participant

    I made a more blunt version of it & spins even better now.

    I had to put off finishing putting my jackscrew legs on as there was a bald faced hornets nest in the doorway to my shed. I originally thought it was a wasp nest & was going to leave it alone until Fall, but when one of them stung me twice, I decided it was time for them to go. If I had realized it was a hornets nest, I would have taken care of it earlier. It seems to smell a little like Raid in my shed now, so I need to air it out once I am sure the hornets are gone.

Viewing 10 posts - 1 through 10 (of 10 total)

You must be logged in to reply to this topic.