Unistrut Bridge Crane

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    Unistrut Bridge Crane

    Why the hell not?

    A friend built a 12x20 skidoo shop. Used 2x6 for ceiling member with the intention of putting a 2x8 up there with some eye bolts for lifting spots. Laying in bed last night I was thinking how it would be sweet to be able to move in at least one direction with a hoist, or even 2 directions.

    So, plan for now is to buy a sleeve of 100 608-ZZ skateboard bearings and some 5/16 roll pins and make 8 of these:

    Click image for larger version Name:	strut trolley.jpg Views:	0 Size:	60.5 KB ID:	203534

    Then attach two lengths of standard unistrut to the ceiling perpendicular to the rafters, attached with those fancy new-style lag bolts. Probably 5 feet apart.

    Click image for larger version Name:	unistrut.jpg Views:	0 Size:	87.3 KB ID:	203535

    Then span those with a bridge of two strut side by side with some tubing to stiffen the bridge.


    The trolley is rated at 600 lbs and I'll be using 4 to hang the bridge, and another 4 to hang the hoist.





    Should be a dirt cheap way to have a super low profile 3 axis crane. Should easily lift anything snowmobile and small engine related (<1000 lbs). Snagging a 800 4-stroke engine out of a skandic and setting it on the workbench would be childs play.

    Change my mind?


    "If she'll wink, she'll fuck"

    GO MINING

    #2
    Do it. And take videos. It'll either be awesome, or make a sweet vid of you dying. 🤣

    I don't think I'd stand under the load, personally....

    Comment


      #3
      I think the way unistrut works is by the straps holding it together, I would be concerned of it spreading under load and having the carriage you built falling out.
      but I'm no engineer.

      Comment


        #4
        We use this at work to lift and move 100 HP motors or tube bundles that are being replaced. We use the double strut the trolley slides in. Works so well I'm planning on doing this in my workshop that's a 10x20. but only spanning 10 feet.

        Comment


          #5
          Attach it where it crosses every rafter for maximum deflection prevention. There has to be a uni strut spec for how much weight it can take on an unsupported length before the "U" fails. That it is distributed to four roller contact points probably helps too.

          But I do know for a fact that a 14' 2x12 drilled centerline with a 1" steel dowel through it can support a 1.5 ton chain fall and an iron Spitfire 4 cyl engine no problem. The chain fall was just suspended from the dowel on a short length of chain bolted together. I may have even had the trans on there as well. It's been a while.

          Comment


            #6
            .....and we're a go!

            Time to source 608 bearings, 5/16x1.375 split pins, and spacers.

            Any suggestions as to what I should use to space the bearing out from the plate? I don't think it needs it, but I could weld the spacer to the trolley plate to stiffen things up a bit.

            If only I had a lathe to square up some spacers.

            Oh, and we're doing the full length of the shop, so 20 feet long, 5 foot wide.


            "If she'll wink, she'll fuck"

            GO MINING

            Comment


              #7
              how thick do the spacers need to be?

              Or, just increase the thickness of your plate to locate the bearings correctly in the unistrut

              Comment


                #8
                Originally posted by jeepnmatt View Post
                how thick do the spacers need to be?

                Or, just increase the thickness of your plate to locate the bearings correctly in the unistrut
                Math says the spacers on either side should be 0.305 inches for exact fit, so I'm guessing a 1/4 inch spacer on each side should be about right. I suppose the easiest thing would be to add a 1/4 inch strip on either side of the plate, weld in place then make my holes.


                "If she'll wink, she'll fuck"

                GO MINING

                Comment


                  #9
                  Harrington makes this sexy little chain hoist. 1/4 ton, looks to be the same size as 1/4 ton lever hoists.

                  Pricey though, (compared to the levers).

                  Click image for larger version
Name:	harrington hoist.jpg
Views:	326
Size:	19.4 KB
ID:	204057


                  "If she'll wink, she'll fuck"

                  GO MINING

                  Comment


                    #10
                    I guess I should be looking for coil-pins instead of split pins?

                    Click image for larger version
Name:	Coil-Pins.jpg
Views:	327
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ID:	204162


                    "If she'll wink, she'll fuck"

                    GO MINING

                    Comment


                      #11
                      Local place down in Oroville sells the part with the bearings of various types.

                      And the Steel.

                      They are called "All Metals".

                      https://www.allmetalssupply.com/prod...heels-4-plate/

                      Part #
                      ZH820-0115

                      Comment


                        #12
                        I did this same thing in my old garage, just in one direction, and used it as an attic hoist with a 1,000# warn 120v winch on it. Wokred perfectly. I had it over an attic scuttle, so I could use it in the garage, or use it to pull items up into the attic and slide them over to the decking up there for storage.

                        Comment


                          #13
                          Seems like a perfect solution for a light-duty overhead crane for sheds and whatnot.

                          Post many pics, I may do this in my shed as well.

                          EDIT: Found some docs. This is pretty impressive.
                          https://www.unistrut.us/assets/unist...olley_Broc.pdf

                          https://www.unistrut.us/products/1-5...aming/trolleys

                          https://www.youtube.com/watch?v=7V5toTT3gbo
                          Last edited by GLTHFJ60; 1 week ago.
                          1987 FJ60 "Moonshine" - 4BT+stuff
                          2004 F550 "Project Mayhem" - 6.0+stuff

                          Comment


                            #14
                            I'd like to see the parts list for the next size up of this concept. Like big enough to lift an LS engine and trans.

                            Comment


                              #15
                              Sliding garage door track is another option.

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