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Recent CAD projects in Sketchup

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  • Recent CAD projects in Sketchup

    I always need something to do in the middle of the night when I can't sleep so I frequently work on 3D models in Sketchup just for fun.

    Here are a few:

    This is a roll off roof observatory for the new scope. It's what I would like to build but it isn't going to happen this year. I have too many projects outside that were shut down by the heavy smoke last year.



    This is a purely imaginary research/diving/ROV/coastal vessel. Since cost is no object it's 85 feet long with a displacement of around 60 tonnes. This is a WIP (Work In Progress) so there are many details missing such as hatches, anchors, interiors and bulkheads etc. The models contains detail down to the level of screw heads.



    This is a coilgun/railgun that can launch a car sized projectile at 2 kilometres per second. It is designed using the SketchyPhysics 3.2 software and actually uses the magnetics simulation to launch the projectile. All the "coils" are active in the simulation instead of just cheating and giving the projectile a programmed velocity vector.

    You can check it out on the Google 3D warehouse at

    http://sketchup.google.com/3dwarehou...647575&ct=mdsa

    It requires SketchUp 7 or 8 and only works with the latest version of SketchyPhysics 3.2



    It also contains (unpublished) a working helicopter that can be flown.



    None of these models contain any components from other peoples work.
    Free software for calculating bolt circles and similar: Click Here

  • #2
    Very impressive models.

    I'm wondering how you defined the hull shapes of the catamaran. If I could do that I might take up model shipbuilding myself.
    Allan Ostling

    Phoenix, Arizona

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    • #3
      It is impossible to explain so I will have to do a step by step tutorial. It isn't as difficult as it may look even though this hull is pretty complex. I still haven't installed the propulsion.



      The cool thing is that I can actually test the stability and balance in SketchyPhysics. I haven't done that yet as I still have a lot of items to add. You can place items and specify a density for the volume which is then used to calculate the weight and balance when it is floating.
      Free software for calculating bolt circles and similar: Click Here

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      • #4
        You sick little monkey! That's a bunch of ridiculousness right there.


        Now.


        About that railgun...


        You have a parts manifest yet?

        ----
        Proud machining permanoob since September 2010

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        • #5
          Great work, Evan. I'm still in the very basic learning curve of Sketch up.
          ZL1OG:KH0EX

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          • #6
            Originally posted by Evan
            It is impossible to explain so I will have to do a step by step tutorial. It isn't as difficult as it may look even though this hull is pretty complex.
            I'm wondering if you can model hull shapes to scale, from measured drawings. I'd like to eventually be able to go from a table of offsets, shown here:




            ... to a perspective view of the hull, as in this example from Howard Chapelle's American Small Sailing Craft:




            This strikes me as a pretty tall order for SketchUp, but perhaps not impossible.
            Last edited by aostling; 03-25-2011, 11:21 PM.
            Allan Ostling

            Phoenix, Arizona

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            • #7
              Evan,
              You are really good at that, also takes more then some sketchup skill, skill can be learned, imagination.... well, that's another thing, unfortunately, a trait I seem to be lacking in.

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              • #8
                liked the observatory, i remember speaking to Patric moore after a lecture he gave at a local lecture hall, he was signing the books me and my son had purchased when i asked about his observatory at home, that was it, he was off on a good old rant about his neighbours giant beech[i think] trees beeing in the way of a big bit of sky and the damn things had even stood up to a hurricane, i definately got the impression he was not a tree hugger.
                Anyway not being up on the subject i always thought observatories benifited from some rotational capacity, how would you manage [i think i'm just kinkey about great big domes like Palomar!
                mark

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                • #9
                  My northern sky isn't worth looking at as there is some sky glow from the nearby town. I also have a very high horizon to the east so that leaves only the south to the west up to the zenith as usable observing directions. There is also a very important benefit to the roll off roof design. If it has a lot of snow and ice on it that just rolls along with it. Domes always leak and you have to clean them off to be able to open the port.

                  As for modeling to a table of offsets, that is certainly possible although it will be tedious. I am looking for a macro recorder that works as a plugin for Sketchup. That way it will be compatible with Windows or Mac.

                  I'm going to try and explain how the hull was modeled. I'll see if I can find a table of offsets for a canoe design to play with.
                  Free software for calculating bolt circles and similar: Click Here

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                  • #10
                    Nice job Evan, I have used Sketch-up a couple of times to model porches and backyard decks that I have built for customers. It is a pleasure to use.

                    Tim

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                    • #11
                      Originally posted by tmc_31
                      Nice job Evan, I have used Sketch-up a couple of times to model porches and backyard decks that I have built for customers. It is a pleasure to use.

                      Tim
                      Tim, I'm curious as to whether you (or others) have used the function I've seen in Sketchup to incorporate modelling into an existing photo? I have a porch I need to change and have a few ideas but I'm not really sure how they'll look on this particular house in reality. I'd like to take a photo and model the porch on to is. There's an existing porch but it looks crap, so it's a matter of changing it to something that looks better yet is still in keeping with the rest of the house and uses the existing porch structure as much as possible. Beyond my weeny imagination, so time to crank up some VR

                      Pete

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                      • #12
                        Nice to see someone else enjoys solid modeling the way I do. Outstanding work Evan, but I cant help but wonder if youre ever going to upgrade to a program that has some real functionality? Drawing those hulls in the manner aostling described would be a breeze in several of the programs I use.
                        "I am, and ever will be, a white-socks, pocket-protector, nerdy engineer -- born under the second law of thermodynamics, steeped in the steam tables, in love with free-body diagrams, transformed by Laplace, and propelled by compressible flow."

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                        • #13
                          Drawing those hulls in the manner aostling described would be a breeze in several of the programs I use.
                          It is really easy in SketchUp too. SketchUp has a great deal of almost hidden functionality that isn't documented. In fact, that is by far the biggest weakness of the program. It doesn't have any real documentation.

                          I simply cannot justify spending a lot of money for something that amounts to entertainment.
                          Free software for calculating bolt circles and similar: Click Here

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                          • #14
                            I simply cannot justify spending a lot of money for something that amounts to entertainment.
                            If everyone thought that way the GDP of the US would probably drop by 30%.

                            Those are some nice Sketchup drawings.
                            Tom - Spotsylvania, VA

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                            • #15
                              I was doodling around trying to figure out the best way to make a tutorial on curved surfaces and then I became sidetracked.

                              This is what happened instead. BTW, everything in the image is my work.



                              Free software for calculating bolt circles and similar: Click Here

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