3D Patterns for a Threshing Drum

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3D Patterns for a Threshing Drum

Home Forums 3D Printers and 3D Printing 3D Patterns for a Threshing Drum

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  • #31486
    JasonB
    Moderator
      @jasonb
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      #192211
      JasonB
      Moderator
        @jasonb

        I was over on Traction Talk Forum yesterday and Ian (Shiremog) had posted a photo of some 3D printed patterns for a 3" threshing drum he is making, he has said its OK to share the photos here which I thought may be of interest as its always better to see the prints being put to a use we can relate to rather than printing out trinkets etc. The printer is an Ultimaker2, the same as Andrew J uses.

        Some of the patterns, apparently there are over 120 castings in the model all home cast in aluminium or bronze. Click for a larger image

        patterns.jpg

        More detailed shots of some of the patterns, the small cube is a core box – its an easy job to click a button and print the space around an object rather than the object itself.

        pattern-corebox.jpg

        pulleys.jpg

        brackets.jpg

        corn-spouts.jpg

        And a pic of the wheel hub with the holes for the spokes to fit into, wheel is 10" dia for an idea of scale.

        thresher-wheel.jpg

         

        Edited By JasonB on 03/06/2015 10:04:06

        #192219
        Ady1
        Participant
          @ady1

          One and a half to two grand for a unit and you're good to go

          This could really give the castings market a boost, all sorts of projects become possible

          How much is the raw material for printing?

          Looked it up, about 30quid per 0.75kg, so not cheep for the good stuff, say about 5kg for that set of castings, 150 to 200 quid?

           

          Edited By Ady1 on 03/06/2015 10:59:20

          #192229
          GarryC
          Participant
            @garryc

            Sorry Jason couldn't resist putting up these couple of photos of my Grandad with the real thing…

            No probs if you want to delete of course!

            Cheers

            Garry

            pic2.jpg

            pic1.jpg

            Cheers

            Garry

            #192231
            Diane Carney
            Moderator
              @dianecarney30678

              Pneumatics !! That's posh wink

              #192235
              GarryC
              Participant
                @garryc

                Yes we set the trend down here for others to follow Diane..!

                pic 3.jpg

                #192236
                Roderick Jenkins
                Participant
                  @roderickjenkins93242

                  Very impressive. There will be some tricky sand moulding ahead. I look forward to seeing the castings.

                  Thanks for the heads-up Jason.

                  Rod

                  #192241
                  Neil Wyatt
                  Moderator
                    @neilwyatt

                    Great prints too.

                    Will he being doing 'lost PLA' or making conventional moulds (as hinted by the use of a core box), or a mixture of both?

                    Neil

                    #192247
                    JasonB
                    Moderator
                      @jasonb

                      Neil, if you take a closer look at the patterns you will notice a white dusty look to them where they still have talc on the surface used as a release agent to stop the sand sticking. Traditional sand casting with single or two part patterns as needed.

                      Rod a few of the finished castings can be seen in teh last photo I posted.

                      Couple more, this feed screw would have been impossible to pull from a two part mould so it was screwed out of the sand to leave the cavity, hence its not as good a finish as the other castings.

                      pattern2.jpg

                      pattern3.jpg

                      #192254
                      John Stevenson 1
                      Participant
                        @johnstevenson1
                        Posted by JasonB on 03/06/2015 14:25:07:

                        A few of the finished castings can be seen in the last photo I posted.

                        .

                        Jason

                        Think you have the last mixture mixed up unless they are casting in wood ? sad

                        #192255
                        KWIL
                        Participant
                          @kwil

                          Big dusty machines, remember working on one in the 1940s bagging the grain.yes

                          #192257
                          JasonB
                          Moderator
                            @jasonb
                            Posted by John Stevenson on 03/06/2015 15:25:33:

                            Posted by JasonB on 03/06/2015 14:25:07:

                            A few of the finished castings can be seen in the last photo I posted.

                            .Jason

                            Think you have the last mixture mixed up unless they are casting in wood ? sad

                            Another one that needs to go to spec savers, look closely and fixed to the wood are various bits of metal, just above the wheel is the bronze casting of the curved spoke pully the pattern for which is in an earlier photo, several other bits in bronze & ali there too.

                            #192286
                            Neil Wyatt
                            Moderator
                              @neilwyatt

                              > talc on the surface used as a release agent

                              Ah, I assumed is was some sort of bloom, probably because I saw a particularly faded red car yesterday.

                              Neil

                              #192289
                              Boiler Bri
                              Participant
                                @boilerbri

                                This fellow is very skilled looking at the patterns. Was this his profession?

                                Brian

                                #192294
                                John Stevenson 1
                                Participant
                                  @johnstevenson1

                                  The skill here Brian is drawing in 3D, the printing is virtually automatic.

                                  #192313
                                  Jesse Hancock 1
                                  Participant
                                    @jessehancock1

                                    I would have thought the skill is in the use of scissors to cut the 3D print to the proper shape. Or did he use origami?

                                    #192319
                                    JasonB
                                    Moderator
                                      @jasonb

                                      You still need to know a bit about pattern making, easy enough to draw up a part but not much use if it can't be pulled from the sand so correct draft and maybe loose piece need to be added or you don't add machining allowances where needed. Also think about how you will machine the part – a simple chucking spigot added at the time can make life a lot easier. If using iron thin extremities can get chilled so again its worth adding a bit of extra material to the end so that can be cut off to leave good iron where you need it.

                                      J

                                      #204544
                                      Keith Griffin 1
                                      Participant
                                        @keithgriffin1

                                        Could the patterns be made available for sale/loan/hire as I am in the early stages of building one of these machines?

                                        #204619
                                        JasonB
                                        Moderator
                                          @jasonb

                                          Keith, your best bet would be to join Traction Talk forum, only needs an e-mail and then you will be able to view this thread and ask Shiremog himself.

                                          J

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