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The biggest advantage of using CAD for designing

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  • The biggest advantage of using CAD for designing

    I have realized one of the advantages of using a CAD program to help in making parts. One can build the part in the CAD program and print it out. Go to the shop and machine the part. If when you machine the part you make a mistake and remove too much material and have the machined part off size all you have to do is go back into your CAD program and change the dimensions! Now you have a part exactly machined. If you draw with pencil and paper it is a lot more work to get your parts exactly!!!!!!!

    One of the big advantages of a parametric CAD program!
    Location: The Black Forest in Germany

    How to become a millionaire: Start out with 10 million and take up machining as a hobby!

  • #2
    Just use larger tolerances, that way you don't even have to change the cad drawing!
    For me, modeling in 3d parametric cad allows me to "build stuff" when I am forced away from my work shop due to "life".

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    • #3
      For my farm work my tolerances are not often very critical on the parts I make!

      Yesterday I made a CAD part in Alibre Design. It was a trunion plate for a air cylinder for my sheep shearing machine. In CAD my design seemed like it would work. In reality I didn't leave enough room for the nut on the end of the rod on the cylinder. So in the shop I changed my design and built the plate. Then I went back and changed the CAD drawing.

      Of course I was making a half joke about changing the CAD to match my mistakes but......only half a joke. For you real machinists of course that is not an option I know. And as I get better I hope it happens less often.
      Location: The Black Forest in Germany

      How to become a millionaire: Start out with 10 million and take up machining as a hobby!

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      • #4
        Originally posted by Black Forest
        Yesterday I made a CAD part in Alibre Design. It was a trunion plate for a air cylinder for my sheep shearing machine. In CAD my design seemed like it would work. In reality I didn't leave enough room for the nut on the end of the rod on the cylinder. So in the shop I changed my design and built the plate. Then I went back and changed the CAD drawing.

        If you took the time to build your model completely, the nut would have been
        in there, you would have fixed that interference problem on the screen.
        Even in 2-d autocad, you could lay out the complete working range of
        the machine in question, showing the complete range of motion
        of that offending air cylinder.

        Fixing the CAD model to match what you made is bass ackward.

        One of the bigger reasons for CAD is the ability to export the surfaces
        (electronically) directly to a cnc plasma cutter, a cnc mill, a cnc lathe.
        Thereby programming the machine using the CAD file *granted there is a
        CAM program step in there, along with post processing to talk to
        the machine.

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        • #5
          Digger Doug, are you being serious? I was being sarcastic or whatever you call it.....

          Of course all that you said is true and I knew that already. OK, I'll say it again, It was a joke!!!! Sorry for taking up your time with a joke....
          Location: The Black Forest in Germany

          How to become a millionaire: Start out with 10 million and take up machining as a hobby!

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          • #6
            No I was being serious, I have to assume your a new-to-cad operator,
            and do not re-alize all the advantages and techniques to making
            a complete layout.

            10 more minutes in front of the screen to draw all of the elements,
            saves several hours (or days) in the shop of fix-ups.

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            • #7
              Facetious is the word you were looking for. I also like using cad to design parts that I may never build. It is a lot like making things in the shop. 3D Cad is much like a machine shop simulator which is what it is supposed to be.
              Free software for calculating bolt circles and similar: Click Here

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              • #8
                Yes Evan, that was the word, Facetious!

                What is interesting to me is as I build a part in CAD I try to build it how I would build it in the shop.

                Now if I could render my pictures in POV from Alibre I would have much better pictures to hang in my shop.........deflector to keep the whosh from being lost!

                Don't worry I have not been drinking...that last comment actually will make sense to one particular member here......
                Location: The Black Forest in Germany

                How to become a millionaire: Start out with 10 million and take up machining as a hobby!

                Comment


                • #9
                  Machine shop simulator and we have an endless supply of raw materials to boot.
                  Location: The Black Forest in Germany

                  How to become a millionaire: Start out with 10 million and take up machining as a hobby!

                  Comment


                  • #10
                    I think my version of Alibre may be broken. I will have to try reinstalling. I sure do not like that program. It is very non-intuitive to me.
                    Free software for calculating bolt circles and similar: Click Here

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                    • #11
                      I have version 12.1 and I think you might have a problem opening 12.1 files in a earlier version. Next month they release a new version.

                      I acutually really like the program. I find it pretty straight forward. But I don't have a lot to compare it to so my opinion is not so valuable.
                      Location: The Black Forest in Germany

                      How to become a millionaire: Start out with 10 million and take up machining as a hobby!

                      Comment


                      • #12
                        Originally posted by Black Forest
                        It was a trunion plate for a air cylinder for my sheep shearing machine. In CAD my design seemed like it would work. In reality I didn't leave enough room for the nut on the end of the rod on the cylinder. So in the shop I changed my design and built the plate. Then I went back and changed the CAD drawing.

                        Design is the work that you do before the parts are made, engineering is the work that you do to fix the design after the parts are made.
                        The shortest distance between two points is a circle of infinite diameter.

                        Bluewater Model Engineering Society at https://sites.google.com/site/bluewatermes/

                        Southwestern Ontario. Canada

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                        • #13
                          I like that Loose Nut! We always called it "jury rigging" I have no idea of the origin.
                          Location: The Black Forest in Germany

                          How to become a millionaire: Start out with 10 million and take up machining as a hobby!

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                          • #14
                            Black Forest, lol, I got it and I'm sure most others did as well.

                            Steve

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                            • #15
                              I used to do this kind of "revisionist" CAD work all the time back in grad skool. I would go to the shop with a drawing and come back with a crooked part and revised drawing. One of my co-workers claimed that it was very "1984", in reference to the book.

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