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    How to make screw threads?

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    • Rich O BrienR Offline
      Rich O Brien Moderator
      last edited by

      Hi John,

      Thanks for the post. Much appreciated and very impressive.

      Looking forward to the tutorial

      rgds
      Rich

      Download the free D'oh Book for SketchUp πŸ“–

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      • D Offline
        driven
        last edited by

        My pleasure,

        I've only been teaching myself SU for the last 3-4 weeks (have dabbled in the past) so as to make animated model of a device I'm designing.

        It involves lots of moving springs and threads so I been trying all sorts of rubies out to try and get a good look with as low a poly count as I can,

        heres a thead I did with arc tool, skin.rb and xformcllone.rb

        and there's one using simpleloft.rb at that subject

        away working for a few days, will have a tidy of my screen cast when I get back, my lack of speed and basic skills makes me cringe when I watch, but the workflows are pretty good.

        john


        this is low'ish poly count


        10 sec. render

        learn from the mistakes of others, you may not live long enough to make them all yourself...

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        • R Offline
          Roger
          last edited by

          Just a thought regarding your goals. How important is the screw thread in your render? If the screw or bolt is the subject of your render, then all the foregoing suggestion by other members of the forum are valid. However, the purpose of the render is to show a device that is far more important than the screw sub components, I have found that a bit map of horizontal lines (like corrugated metal roofing reduced in scale)can be applied to machine screws, bolts or threaded holes can produce a very convincing render and still remain low poly.

          It is all a matter of perception. If the screws are you product or will be seen in extreme close up, then model them. If the roles of the screws is a secondary item to a far more important product, then I say fake them.

          http://www.azcreative.com

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          • R Offline
            RootlessAgrarian
            last edited by

            I gave Screw 2.3 a try but so far am puzzled by it. This version does not offer an entry box for the offset, just a step count and number of turns. I am always getting zero offset -- it just "smears" the shape around into a torus.

            I had a look at the source code and though I don't speak Ruby, I got the impression that it was somehow inferring the offset from the geometry of the shape to be smeared -- some kind of slope derived from an edge orthogonal to the axis of the lathing operation. Can anyone confirm?

            Nothing is 'mere'. -- Richard Feynman

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            • N Offline
              NewOne
              last edited by

              @driven said:

              I'll put up a tutorial if anyone wants..

              YES, please! πŸ˜„

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              • D Offline
                driven
                last edited by

                haven't sorted screen casting out yet, but I found screw1.5.rb is the most stable on my mac.

                it appears to be the same as described in the PDF tutorial for screw2 (http://www.crai.archi.fr/RubyLibraryDepot/Ruby/screw2_1_tutorial.pdf)

                Offset is determined by the distance your profile is drawn from the blue axis so construct at origin, in free space.

                Use a new page/layer/or hide/move whatever is there already and make it a group or component for further use.

                john

                learn from the mistakes of others, you may not live long enough to make them all yourself...

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                • W Offline
                  watkins
                  last edited by

                  You might find these thread textures useful.

                  http://forums.sketchucation.com/viewtopic.php?f=40&t=11378&hilit=+threads

                  They are not perfect, but do the job and are low poly. The attached drawing used the textures.

                  Regards,
                  Bob


                  Thread textures.jpg

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                  • A Offline
                    ALWX65
                    last edited by

                    This is something I really want to learn. Is there a video anywhere showing exactly how to do it? All I want to do is show the threaded portion of a bolt sticking out the back of a nut.

                    ALW

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                    • A Offline
                      archiasdomesticus
                      last edited by

                      From what I can tell the scripts on that are referenced in this thread (screw, k_tools) are no longer available on at http://www.crai.archi.fr. Have they been moved?

                      What plugins are still available to help with drawing screw threads?

                      Thanks,

                      Jim

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                      • TIGT Offline
                        TIG Moderator
                        last edited by

                        The Ruby Depot moved here
                        http://rhin.crai.archi.fr/RubyLibraryDepot/Ruby/RUBY_Library_Depot.htm
                        It's in transition... You can still find the files but the Search function is broken... as it's looking at the old links...
                        e.g. k_tools http://rhin.crai.archi.fr/RubyLibraryDepot/Ruby/EM/k_tools_50.rb

                        TIG

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                        • A Offline
                          aea
                          last edited by

                          no manage ?


                          SCREW.png


                          screw.skp

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                          • Rich O BrienR Offline
                            Rich O Brien Moderator
                            last edited by

                            Hi,

                            Here's how to use this plugin....

                            Step 1

                            As your bolt has a diameter of 225cm you need to place your thread profile 112.5cm from origin...

                            Step - 1.jpg

                            Step 2

                            Now double click your thread profile and select Plugins>Screw, at this stage you need to choose a start point and an end point. I chose the bottom of the profile as the start point and the top as the end point...

                            Step - 2.jpg

                            Step 3

                            Your bolt was a circle made of 24 segments therefore your thread needs to mimic this for optimum fit so insert 24 into the Step box and choose a whole number for the turns to allow you to align threads afterwards...

                            Step - 3.jpg

                            Step 4

                            Click OK and wait.........

                            Step - 4.jpg

                            Now you can select your thread and align it to your bolt. This is a basic method of achieving what you need. But you could also align your bolt at the origin at the beginning and then apply the steps.

                            The only thing that may change is the dimensions of your threads/lead/pitch which depends on whether it's UNC or UNF

                            Anyway, here's my version to look at...

                            screw.skp

                            Download the free D'oh Book for SketchUp πŸ“–

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                            • liquid98L Offline
                              liquid98
                              last edited by

                              Look here:
                              http://sketchup.google.com/3dwarehouse/details?mid=76063a259e3aec4abf52def0e259b9b0&prevstart=0

                              Things that flourish fall into decay. This is not-Tao, And what is not-Tao soon ends ~ Lao tse

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                              • R Offline
                                Roger
                                last edited by

                                Reminds me of the building I passed on the way home this morning. It was the "Pilgrim Screw Company". It seems like a straight line looking for a joke.

                                http://www.azcreative.com

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                                • gillesG Offline
                                  gilles
                                  last edited by

                                  Here they are.
                                  EDIT: screw1_5 is in fact screw3.0, screw_2.1 is an earlier version.


                                  screw1_5.rb


                                  screw_21.rb

                                  " c'est curieux chez les marins ce besoin de faire des phrases "

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                                  • brookefoxB Offline
                                    brookefox
                                    last edited by

                                    Thread title should perhaps refer to bolt thread, which I am happy to learn about, but I am looking for screw thread.

                                    ~ Brooke

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                                    • R Offline
                                      Roger
                                      last edited by

                                      Pilgrim Screw Company
                                      @roger said:

                                      Reminds me of the building I passed on the way home this morning. It was the "Pilgrim Screw Company". It seems like a straight line looking for a joke.

                                      http://www.azcreative.com

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                                      • K Offline
                                        KE6CVH
                                        last edited by

                                        Hi Gilles, I just downloaded both attachments from your post April 17 2010 and laast edited Mar8 2010. I have them showing up in my plugins when opening sketchup 8 but can't see them in the file folder, kind of strange. One shows up as "screw" and the other as "screw 21". What I need is a tutorial as I don't have the slightest clue how to use them. When I click on the tutorial link on this discussion it brings me to the ruby depot library homepage and if I look under A-Z I can only see the download that doesn't work and no tutorial. Best regards, Mike

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                                        • gillesG Offline
                                          gilles
                                          last edited by

                                          Screw1_5.rb is the one you need (screw in plugins window)
                                          Have a look at Rich's tutorial:
                                          http://sketchucation.com/forums/viewtopic.php?p=245701#p245701

                                          " c'est curieux chez les marins ce besoin de faire des phrases "

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                                          • wimveW Offline
                                            wimve
                                            last edited by

                                            @rich o brien said:

                                            Hi,
                                            Here's how to use this plugin....

                                            Hello,

                                            Was looking for this today. Works like a charm ! Thanks.

                                            Best regards,
                                            Wim
                                            Holland
                                            http://www.petromax.nl/DeBeer.html

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