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FredoStretch Problem

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  • D Offline
    Dave R
    last edited by 7 Feb 2011, 14:04

    I opened the file but there's no component. Just loose geometry. When I make a component of it and run the stretch tool, it works just fine.

    Etaoin Shrdlu

    %

    (THERE'S NO PLACE LIKE)

    G28 X0.0 Y0.0 Z0.0

    M30

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    • D Offline
      dedmin
      last edited by 7 Feb 2011, 14:12

      Because it is a component - You have to insert it as a component. Checked this - exploded and recreated it - the same. Also did the same as You - the same error as before. When I zoom in the misalignment can be seen -

      Capture.PNG

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      • D Offline
        dedmin
        last edited by 7 Feb 2011, 14:26

        It seems like the default is not stretching with the bounding box 😮 😮

        Capture2.PNG

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        • D Offline
          Dave R
          last edited by 7 Feb 2011, 14:38

          Even if I import your SKP so it comes in as a component, I have no problem with the box not aligning correctly. I'm not getting the problem.

          Etaoin Shrdlu

          %

          (THERE'S NO PLACE LIKE)

          G28 X0.0 Y0.0 Z0.0

          M30

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          • D Offline
            dedmin
            last edited by 7 Feb 2011, 14:55

            Strange! Anyway, I made everything from scratch and now seems OK. But I always thought the default is to stretch with the bounding box - I have to be careful in the feature! 💭

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            • D Offline
              Dave R
              last edited by 7 Feb 2011, 14:59

              Interesting thing. I just made a cylinder and tried it. With that I do get what you are showing and the alignment is off by 7.5°. I drew the initial circle dragging out the radius along an axis. The Stretch tool puts aligns the green bounding box to the shortest dimension across the circle which means it ends up being skewed a bit.

              Etaoin Shrdlu

              %

              (THERE'S NO PLACE LIKE)

              G28 X0.0 Y0.0 Z0.0

              M30

              %

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              • D Offline
                dedmin
                last edited by 7 Feb 2011, 15:03

                Yes, something is not right! I use this tool a lot and this behavior is very annoying!

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                • D Offline
                  Dave R
                  last edited by 7 Feb 2011, 16:02

                  It kind of makes sense to me on the cylinder because the tool is making the smallest possible bounding box however I would guess that's not really desired in the case of the cylinder since you'd want it to treat it as a cylinder and not a 24-sided polygon.

                  Etaoin Shrdlu

                  %

                  (THERE'S NO PLACE LIKE)

                  G28 X0.0 Y0.0 Z0.0

                  M30

                  %

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                  • M Offline
                    mitcorb
                    last edited by 7 Feb 2011, 17:57

                    I think the tool is aligning with the nearest segment of the circle that forms the cylinder, since you mentioned that 7.5 degree offset. Again, this is just a guess.

                    I take the slow, deliberate approach in my aimless wandering.

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                    • D Offline
                      Dave R
                      last edited by 7 Feb 2011, 19:17

                      @mitcorb said:

                      I think the tool is aligning with the nearest segment of the circle that forms the cylinder, since you mentioned that 7.5 degree offset. Again, this is just a guess.

                      Yes, that's how I came up with the 7.5°. The box is aligned with the shortest dimensions across the circle and not treating the circle as a circle but as a 24-sided polygon.

                      Etaoin Shrdlu

                      %

                      (THERE'S NO PLACE LIKE)

                      G28 X0.0 Y0.0 Z0.0

                      M30

                      %

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                      • F Offline
                        fredo6
                        last edited by 8 Feb 2011, 21:10

                        @mitcorb said:

                        I think the tool is aligning with the nearest segment of the circle that forms the cylinder, since you mentioned that 7.5 degree offset. Again, this is just a guess.

                        This is correct.
                        Unfortunately, for symetrical shapes like circles, this may not represent the intuitive orientation. I am afraid there is no magic fix in the general case.

                        The best is simply to orient the box manually to the desired direction (click on an edge in the model, or using the arrows for aligning on model axes).

                        Fredo

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