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  1. #21
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    Hi,

    I think I followed the text correctly to find the true lengths. It's what to do next that I am stuck at. I think I have what you said correct now.

    Thank you so much for helping me and everyone on these forums out especially on a Saturday.
    Last edited by chloe2012; 31st Mar 2012 at 06:19 pm.

  2. #22
    Luminous Being JD Mather's Avatar
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    Oops, I just noticed that the circle is offset from center so B-10' is not equal to A-10'

    Your circles don't look like perfect radius.
    Don't type in the radius - use snap points.

    Your next step will be to determine the length of arc from 10-9.
    Not the cord length (many books miss this) you need the arc length.
    Once you find this it is the same for all (9-8 is the same as 10-9).
    Tip- you can find the arc length by
    copy and paste pie shape away from the drawing.
    trim the pie
    list the arc

    Draw circle of R 10-9 arc length at point 10' in your flat development..
    Draw circle of R A-9' at point A

    Where these two circle intersect is point 9' you now have line A-9
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  3. #23
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    No, its not centered. Do I have this first stage correct?

  4. #24
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    Ok, I have done that step, hopefully correct
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    Last edited by chloe2012; 31st Mar 2012 at 06:20 pm.

  5. #25
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    I'm not at my CAD computer thus the reason for my question. Are you working on the Penn-Foster HVAC project?
    "I have only come here seeking knowledge. Things they wouldn't teach me of in college." The Police

    Eat brains...gain more knowledge!

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  6. #26
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    Yes I am. I have seen the pictures of Plate 3 posted. It shows that the end result is supposed to be but not how to get there. I attached a picture of where I have reached. I assume I do the same thing on the left side but not sure what to do next on the right.
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  7. #27
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    This is what I have come up with following instructions that I found online, though they were for a symmetrical piece. I know something is wrong as my arc on the inside isn't correctly meeting the lines for each point. However, I do not know what. Please help when able.
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  8. #28
    Luminous Being JD Mather's Avatar
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    It should be a spline curve - not an arc.

    But you have point D in the wrong location.
    Draw circle R A-D at A.
    Draw circle R A-7 with center at 7 (A-7 and 7-D are same length).

    Where these two circles intersect is the actual location of point D.


    Point D.jpg
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  9. #29
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    HI,

    Think I have it all correct now...hopefully
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  10. #30
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    hello,

    please i need hel for
    DRAFTING THE 14X16X6 HVAC patterns.
    thank you!

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