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  1. #11
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    Thanks SLW210, this looks closest to the Exercise drawing. Can you please tell us how you did it?

  2. #12
    Super Moderator SLW210's Avatar
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    Yes I can place the R5 in very many positions.
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    “A narrow mind and a fat head invariably come on the same person” Zig Zigler



  3. #13
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    When you get back to class ask the instructor how he/she would do the same exercise.
    "I have only come here seeking knowledge. Things they wouldn't teach me of in college." The Police

    Eat brains...gain more knowledge!

    I'm now a full member of the Society for the Promotion of Mediocrity in CAD. Standards? We don't need no stinkin' standards! Take whatever advice I offer and do the opposite.

  4. #14
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    I also think that the R5 and R10 circles are not positioned. I would say that these two circles are tangential at the Ortho points, i.e. the centres of the two circles lie on a vertical line.

    Therefore to draw them, I would offset the R3 circle by 10, and offset the left hand vertical line A by 5. Where these intersect at X (the upper intersection point) is the centre of the R10 circle and hence the R5 circle can be drawn.
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  5. #15
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    I would say that these two circles are tangential at the Ortho points, i.e. the centres of the two circles lie on a vertical line.
    Thanks eldon, this looks to be a reasonable assumption, looking at the exercise drawing, and with the lack of any more definitive information for the centre points of R5 and R10 circles.

    I like the way you have drawn the two loci ( the red straight line and the red circle) of the R10 circle to determine the centre point.

    And your end result looks very much like the exercise drawing.

    Many thanks to all that helped with this problem, I have learnt lots.
    Last edited by PJ01; 20th Oct 2017 at 10:16 pm.

  6. #16
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    My $0.05 Like every one else need a angle of common TP or a length on left side. Its poor workmanship when these examples are missing a vital piece of information.
    A man who never made mistakes never made anything

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    Sometimes, geometry is not compatible with tidy dimensions

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