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  1. #1
    Senior Member Laurel's Avatar
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    Default Construction Problem

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    Hi

    I've a problem with regards to the attached drawing. If anyone can help, I'd be very grateful.

    The drawing represents a screen for a motor-boat. You can see an Isometric view, side elevation and plan (all white layer, 0). Each window in the screen is hinged, so that the window can be folded flat into the horizontal plane. (Shown as the yellow layer, FOLDED OUT). A2 represents A1 folded out, and B2 represents B1.

    I'm struggling to draw an accurate representation of C1. How do I do it, please?

    Thanks,

    Paul.
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    Paul

  2. #2
    Luminous Being JD Mather's Avatar
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    You should have a book that covers developments.

    Personally I would do it as 3D as there is miter concerns that don't show up in an infinately thin flat.
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  3. #3
    Senior Member Laurel's Avatar
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    Thanks for the suggestion JD.

    I must admit, I'm not sure how you arrived at the drawing you have labelled C1, but I don't think it is correct.

    Looking at your drawing, you have labelled the corners of my plan view of C1 as 1 to 4. I would expect the side you have labelled 2 to 3 to be the same length as the left most edge of the plan view labelled B2, but in your drawing of C1, it isn't.

    Or am I missing something?
    Paul

  4. #4
    Full Member Alex_AW's Avatar
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    Something like this.
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  5. #5
    Luminous Being JD Mather's Avatar
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    I had Point 3 in the wrong location.

    ...be the same length as the left most edge of the plan...
    I've never been able to follow a description like this - I have to refer to point labels to understand what we're talking about.
    Last edited by JD Mather; 24th Jan 2008 at 08:49 pm.
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  6. #6
    Full Member Alex_AW's Avatar
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    Quote Originally Posted by Alex_AW View Post
    Something like this.
    I'm not absolutely sure about that variant.
    This one (see attached file) looks more correct from theoretical point of view, but length of 3-4 line on the involute does not equal one on the top view.
    I think you'll have to make a 3D model or cut one from paper to be sure in a variant. If more sensible advises wouldn't come, of course.
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    Last edited by Alex_AW; 25th Jan 2008 at 10:22 am.

  7. #7
    Senior Member Laurel's Avatar
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    Thanks everyone for your sueggestions.

    Alex - I can see where you are coming from with your first suggestion, but it looks a little too skewed to me. I'm not sure about how you have arrived at the 2nd option

    JD - I don't know 3D (yet). You suggested a book on developments. Can you suggest one?

    I've wracked my brain, trying to remember how I learnt how to do it years ago, and arrived at the drawing I have attached. I'm not sure of how accurate it is, but it looks right. Any comments?

    Thanks again,

    Paul.
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    Paul

  8. #8
    Full Member Alex_AW's Avatar
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    Quote Originally Posted by Laurel View Post
    ... I'm not sure about how you have arrived at the 2nd option
    The key is here.
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  9. #9
    Full Member Alex_AW's Avatar
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    Quote Originally Posted by Laurel View Post

    ... it looks right. Any comments?

    ...
    About the results. Lines don't coincide a bit with each other.
    About the way you've got it I'd say nothing . I didn't analyze it - I'm afraid for my brain .
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    Last edited by Alex_AW; 26th Jan 2008 at 09:00 am.

  10. #10
    Senior Member Laurel's Avatar
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    Yes, I see you are right - my solution doesn't fit either.

    I'm struggling to resolve this, anybody else know how?
    Paul

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