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  • More CNC porn

    This time, how about a "billet" motorcross helmet, complete with vents, visor and graphics.

    www.gaskrank.tv

    What is that thing, a seven-axis?

    Doc.
    Doc's Machine. (Probably not what you expect.)

  • #2
    God knows but that is some serious porn. I'm wondering if that could even be done manually to a specified drawing as opposed to it being freehand finished.

    5 /7 years ago this would have been next to impossible but there is a chance Xerox had one 30 years ago

    Thanks for posting it Doc.

    .
    .

    Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



    Comment


    • #3
      5 axis

      Great post Doc.

      Many thanks.

      In the lower right corner it said 5 axis.

      That's what everyone is up against - from Japan in that case - but there is some top-class stuff in Europe - and I suspect else-where in Asia as well.

      Comment


      • #4
        Whilst's it's nice and secretly we would all want one the truth is it's expensive, not so much as in machinery but in software and the training of using it correctly.
        When I say expensive as well as $$$ I also mean time and to be honest many people will never manage to get their heads round in it what they have left of their lifetime.

        This isn't meant nastily as I know for a fact that I am one of those.

        Supporting CNC machines we get asked this 2 1/2D / 3D question every week. Truth is everyone wants to do full 3D shapes, in practice they hardly ever get beyond the simple brackets because of the learning curve and time restraints of what is a hobby.

        Hard fact is that 90% of parts made today are still based on 2 1/2D shapes. Anything you make by hand on you mill can be done by a 3 axis CNC.

        If it's a simple 3D shape it can be done by automatic CAM programs and still run on a 3 axis CNC mill.

        http://www.youtube.com/watch?v=RV8Dq6mslnE

        This was generated from a 3D file off SLD's website, put in Cut3D, tools specified and run.
        It doesn't seem to be cutting as it's doing a final pass at 90 degrees to the first. It's rough as the step over is too course but I want to prove a point more than make a finished gear.

        .
        Last edited by John Stevenson; 01-30-2010, 07:11 AM.
        .

        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



        Comment


        • #5
          How many hours you think it took?

          I just noticed- While i knew it was a demo/sample model (50th anniversary of something) I figured they were going to fit it with conventional padding. Nope, it's a display only- note how they milled what usually would have been cloth-covered padding around the face opening.

          Kind of a shame, I'd love to see some rider actually wear it. Though I'll bet it cost about a hundred grand, counting machine time and writing/verifying the software.

          Doc.
          Doc's Machine. (Probably not what you expect.)

          Comment


          • #6
            A good portion of this multi-axis (3+) has to do with orienting the cutter for optimum feed speed and metal removal.

            Most times the work is done with ball end type cutters. For best performance you don't want to cut near the dead zone at the tip. That's one reason you see the heads/work gyrating around at odd angles. You want the cutter to be cutting out at the perimeter if possible.

            Comment


            • #7
              Originally posted by John Stevenson
              God knows but that is some serious porn. I'm wondering if that could even be done manually to a specified drawing as opposed to it being freehand finished.

              5 /7 years ago this would have been next to impossible but there is a chance Xerox had one 30 years ago

              Thanks for posting it Doc.

              .
              It's hard enough to even design in 3D, let alone machine it
              I'm trying to do a full-face 3D crash helmet at the moment, and it's got multiple compound curves in all axes, and it's nearly impossible to draw it with all the surfaces and get them to blend correctly. Lots of work and I still can't get it right

              Peter

              Comment


              • #8
                If the item being modeled can't be described mathematically and you don't have a sculpted item to measure, modeling an organic shape can be pretty tough.

                Comment


                • #9
                  Tell me something I don't know. As much as I love and know Solidworks, it can't do Class A surfaces as the curvature continuity is too poor.
                  Pro E is better and Alias better still, but I'm stuck with what I've got.

                  Comment


                  • #10
                    Originally posted by John Stevenson
                    Whilst's it's nice and secretly we would all want one the truth is it's expensive, not so much as in machinery but in software and the training of using it correctly.
                    When I say expensive as well as $$$ I also mean time and to be honest many people will never manage to get their heads round in it what they have left of their lifetime.

                    This isn't meant nastily as I know for a fact that I am one of those.

                    Supporting CNC machines we get asked this 2 1/2D / 3D question every week. Truth is everyone wants to do full 3D shapes, in practice they hardly ever get beyond the simple brackets because of the learning curve and time restraints of what is a hobby.

                    Hard fact is that 90% of parts made today are still based on 2 1/2D shapes. Anything you make by hand on you mill can be done by a 3 axis CNC.

                    If it's a simple 3D shape it can be done by automatic CAM programs and still run on a 3 axis CNC mill.

                    http://www.youtube.com/watch?v=RV8Dq6mslnE

                    This was generated from a 3D file off SLD's website, put in Cut3D, tools specified and run.
                    It doesn't seem to be cutting as it's doing a final pass at 90 degrees to the first. It's rough as the step over is too course but I want to prove a point more than make a finished gear.

                    .
                    Googling SLD's website gave me to many choices that didnt fit the description, can you post the link please?

                    Comment


                    • #11
                      Originally posted by oldtiffie
                      In the lower right corner it said 5 axis.

                      That's what everyone is up against - from Japan in that case - but there is some top-class stuff in Europe - and I suspect else-where in Asia as well.
                      See what you can do when your government doesn't give away your industries to outsourcing

                      Comment


                      • #12
                        Originally posted by oldtiffie
                        Great post Doc.

                        Many thanks.

                        In the lower right corner it said 5 axis.

                        That's what everyone is up against - from Japan in that case - but there is some top-class stuff in Europe - and I suspect else-where in Asia as well.
                        When did Deckel Maho defect to Japan...last time I looked they were German....and are "very top-class stuff from Europe" ..

                        Comment


                        • #13
                          Originally posted by Tony Ennis
                          If the item being modeled can't be described mathematically and you don't have a sculpted item to measure, modeling an organic shape can be pretty tough.

                          I'd say that is why a lot of designs start out as scuplted pieces of clay and then backplotted to 3D cad to help generate the code. Even with a really good sculptor the price to pay them to scupt two or three of those helmets from scratch would be nothing compared to drawing it up out of thin air. Of course I know the helmet was probably backplotted from an identical production helmet or at least one that has been modified but the sculpting part I'm talking about is for one off parts that have no piece to backplot from.
                          Jonathan P.

                          Comment


                          • #14
                            Originally posted by mochinist
                            Googling SLD's website gave me to many choices that didnt fit the description, can you post the link please?
                            mochinist,

                            I can't find the damn thing, in fact I can't now find any stl's of spiral bevels, I'm sure it was SLD web site but now not sure but can't find any on other sites.

                            It was a free 3D download from one of the gear company sites.
                            Problem is a lot of these sites download a file as 1223345.zip so searching on an old hard drive is hard.
                            I'll try to look though as I'd like to do a better one for a sample.
                            .
                            .

                            Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                            Comment


                            • #15
                              man, and I am happy when the new v's on my fab'ed aloris toolholders fit
                              "Good judgment comes from experience, and often experience comes from bad judgment" R.M.Brown

                              My shop tour www.plastikosmd.com

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