+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 10 of 14
  1. #1
    Junior Member
    Using
    AutoCAD 2017
    Join Date
    Oct 2017
    Posts
    19

    Question Creating a curve with radius 5 circles

    Registered forum members do not see this ad.

    If drawing two radius 5 curves, so that the horizontal is 8 units as shown, where would you place the centres of the 5 radius circles?

    I think possibly also a circle may have to be offset to achieve this, I'm not sure.

    I've tried various scenarios of radius 5 circles, but can't get it to quite match.

    Thanks for any help!


    cad.jpg

  2. #2
    Junior Member
    Using
    AutoCAD 2017
    Join Date
    Oct 2017
    Posts
    19

    Default

    I'm fairly sure I've now sorted this.

  3. #3
    Forum Deity
    Using
    AutoCAD 2002
    Join Date
    Sep 2006
    Location
    East Sussex, U.K.
    Posts
    4,076

    Default

    To get all circles to be tangential, there is only one solution to your problem, given the required circle radius, and it determines what is the vertical dimension between the lines.

    As you have solved it, perhaps you could share your method for the benefit of others.

  4. #4
    Junior Member
    Using
    AutoCAD 2017
    Join Date
    Oct 2017
    Posts
    19

    Default

    The way I went about it was as follows.

    I drew a radius 10 circle centred on the right side of the measurement 8.

    Then I drew a radius 5 circle centred on the left side of the measurement 8.

    Then where this last circle and the radius 10 circle intersect I drew a new circle of radius 5 (highlighted in image below.

    Then I trimmed away excess.

    cad2.jpg

  5. #5
    Junior Member
    Using
    AutoCAD 2017
    Join Date
    Oct 2017
    Posts
    19

    Default

    Also, I started off with a radius 5 circle centred on the right of the measurement 8. Should have mentioned that.

  6. #6
    Forum Deity
    Using
    AutoCAD 2002
    Join Date
    Sep 2006
    Location
    East Sussex, U.K.
    Posts
    4,076

    Default

    Thank you for sharing your solution.

    It is pretty much how I drew it up, but, as ever, there are many ways that lead to the same solution, although some use fewer key strokes than others!

  7. #7
    Super Member
    Computer Details
    tombu's Computer Details
    Operating System:
    Windows 7 64-bit
    Computer:
    Dell
    Discipline
    Civil
    tombu's Discipline Details
    Occupation
    Design Analyst
    Discipline
    Civil
    Details
    Small Street & Stormwater projects. Traffic Calming and other issues.
    Using
    Civil 3D 2018
    Join Date
    Dec 2010
    Location
    Tallahassee, FL USA
    Posts
    744

    Default

    Too much information. For the arcs to be tangent to lines and each other you cannot hold both the 5' radius and the horizontal distance of 8'. The image above holds only the 5' radius.
    Layer 0 for ByBlock Block entities, everything else ByLayer. So many issues can be solved with good templates.

  8. #8
    Forum Deity
    Using
    AutoCAD 2002
    Join Date
    Sep 2006
    Location
    East Sussex, U.K.
    Posts
    4,076

    Default

    I would have thought just enough information. For a horizontal distance of 8, there are arcs of many radii to join, but each arc has its vertical distance.
    Attached Images

  9. #9
    Forum Deity steven-g's Avatar
    Computer Details
    steven-g's Computer Details
    Operating System:
    Win 7
    Discipline
    Construction
    steven-g's Discipline Details
    Occupation
    Draughtsman
    Discipline
    Construction
    Details
    I work in the estimating department of a large building contractor.
    Using
    AutoCAD 2018
    Join Date
    May 2013
    Location
    An Englishman in Belgium
    Posts
    2,086

    Default

    The question implies that the distance of 8 units is the distance between the centres of the two arcs measured horizontally, it also implies that the where the arcs meet they are tangent. With only that information there are 2 answers.Both of which use a vertical difference of 6 units between the centres. Though obviously, only one meets the visual image given.

    8.jpg
    I've just been down graded from 2012LT to full Autocad 2017. I WANT LT BACK

  10. #10
    Forum Deity
    Using
    AutoCAD 2002
    Join Date
    Sep 2006
    Location
    East Sussex, U.K.
    Posts
    4,076

    Default

    Registered forum members do not see this ad.

    Quote Originally Posted by steven-g View Post
    The question implies that the distance of 8 units is the distance between the centres of the two arcs measured horizontally, it also implies that the where the arcs meet they are tangent..........
    There are in fact a couple more answers (what is a negative sign between friends), but scenario 1 seems to meets the OP's requirement.
    Attached Images

Similar Threads

  1. Hello! I need to curve 3D object on radius, if possible hellp pleas. Thanks.
    By S1L3NC3 in forum AutoCAD 3D Modelling & Rendering
    Replies: 6
    Last Post: 3rd Feb 2017, 01:17 pm
  2. Routine to Select Circles by Radius or Diameter
    By troggarf in forum AutoLISP, Visual LISP & DCL
    Replies: 20
    Last Post: 6th Sep 2013, 01:58 am
  3. ObjectARX - Selected Circles Center and radius.
    By gnanapaul in forum AutoLISP, Visual LISP & DCL
    Replies: 2
    Last Post: 16th Dec 2009, 11:02 am
  4. AutoLisp for selecting Similar Radius Circles
    By sparami in forum AutoLISP, Visual LISP & DCL
    Replies: 6
    Last Post: 22nd May 2009, 12:46 pm
  5. circles on a radius
    By autocack in forum AutoCAD Beginners' Area
    Replies: 8
    Last Post: 10th Feb 2009, 03:13 pm

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts