Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

AutoCad puzzle.

Options
  • 13-05-2013 1:53am
    #1
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭


    How do you draw this in autocad?

    253605.JPG

    Only have AutoCAD 2005 btw (hanging head in shame...)


Comments

  • Options
    #2
    toastedpickles
    Closed Accounts Posts: 9,607 ✭✭✭toastedpickles


    What's it supposed to be firstly?


  • Options
    #3
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    Part of a site. The rest is even more complicated, should be able to do it if I can do the first bit I'm thinking ;-)


  • Options
    #4
    Celly Smunt
    Banned (with Prison Access) Posts: 9,464 ✭✭✭Celly Smunt


    You could do it old skool with a bit of trigonometry and a calculator to get your angles.


  • Options
    #5
    toastedpickles
    Closed Accounts Posts: 9,607 ✭✭✭toastedpickles


    It's a feckin awkward yoke isn't it?

    I've it drawn here on mine (2011) and it's not adding up at all, does it taper in or anything?


  • Options
    #6
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    toastedpickles wrote: »
    It's a feckin awkward yoke isn't it?

    I've it drawn here on mine (2011) and it's not adding up at all, does it taper in or anything?

    It was done with a surveyors tape (50m) so should be fairly accurate.

    That said, I did not do it but I know the guy and I'd trust his measurements normally...


  • Advertisement
  • Options
    #7
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    pmcmahon wrote: »
    You could do it old skool with a bit of trigonometry and a calculator to get your angles.

    No way of making AutoCAD do this? The other measurements are much more complex ;-)


  • Options
    #8
    toastedpickles
    Closed Accounts Posts: 9,607 ✭✭✭toastedpickles


    cgarrad wrote: »
    It was done with a surveyors tape (50m) so should be fairly accurate.

    That said, I did not do it but I know the guy and I'd trust his measurements normally...

    It doesn't match up, I'd measure it yourself again, just to be sure, can never trust surveyors in my opinion

    But does the site taper in or anything like that? or is it just a rectangle?


  • Options
    #9
    Celly Smunt
    Banned (with Prison Access) Posts: 9,464 ✭✭✭Celly Smunt


    cgarrad wrote: »
    No way of making AutoCAD do this? The other measurements are much more complex ;-)

    Not that i'm aware of,though i'm by no means a CAD expert :pac:


  • Options
    #10
    Cedrus
    Registered Users Posts: 1,429 ✭✭✭Cedrus


    I'd draw the bottom line 9400 first.
    Then centre a circle at each end, radius 12550 on the left and 17650 on the right then osnap a line from the left end of the first line to the intersection of the circles. delete the circles. Left perimeter done.
    Repeat for the 12000 & 13950 dims and you have the right perimeter.
    Osnap a line from the ends for the lane perimeter and if its 5650 the surveys good.

    There's probably a quicker way but I'm old school.


  • Options
    #11
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    Used this to get the angles

    http://ostermiller.org/calc/triangle.html

    Back in 10 ;-)


  • Advertisement
  • Options
    #12
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    Cedrus wrote: »
    I'd draw the bottom line 9400 first.
    Then centre a circle at each end, radius 12550 on the left and 17650 on the right then osnap a line from the left end of the first line to the intersection of the circles. delete the circles. Left perimeter done.
    Repeat for the 12000 & 13950 dims and you have the right perimeter.
    Osnap a line from the ends for the lane perimeter and if its 5650 the surveys good.

    There's probably a quicker way but I'm old school.

    Great idea ;-)


  • Options
    #13
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    Not too bad but not correct.

    Other ones are not possible without more measurements though.


  • Options
    #14
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    No DWG support so zipped it.


  • Options
    #15
    Supertech
    Registered Users Posts: 597 ✭✭✭Supertech


    Cedrus wrote: »
    I'd draw the bottom line 9400 first.
    Then centre a circle at each end, radius 12550 on the left and 17650 on the right then osnap a line from the left end of the first line to the intersection of the circles. delete the circles. Left perimeter done.
    Repeat for the 12000 & 13950 dims and you have the right perimeter.
    Osnap a line from the ends for the lane perimeter and if its 5650 the surveys good.

    There's probably a quicker way but I'm old school.

    ^^This is the correct way to do it.

    It looks to me like you need more diagonals on the survey, and, if it's three parts of the same field, you need some diagonals to tie the individual parts together. If not you'll carry errors from one section of the survey to the next, and the survey won't line up correctly.

    Incidentally, when I draw the first part starting from the 9400 dimension and working anticlockwise, I'm getting a 100mm error when I close the perimeter and check the last diagonal - that's not too bad for a survey done with a tape - you'll rarely get a taped survey to close completely.


  • Options
    #16
    EmmetF
    Registered Users Posts: 145 ✭✭EmmetF


    Supertech wrote: »
    ^^This is the correct way to do it.

    It looks to me like you need more diagonals on the survey, and, if it's three parts of the same field, you need some diagonals to tie the individual parts together. If not you'll carry errors from one section of the survey to the next, and the survey won't line up correctly.

    Incidentally, when I draw the first part starting from the 9400 dimension and working anticlockwise, I'm getting a 100mm error when I close the perimeter and check the last diagonal - that's not too bad for a survey done with a tape - you'll rarely get a taped survey to close completely.

    Exactly, I'm getting a 100mm error which is remarakably accurate on a 9.5m measurement (1% error)

    Homework attached.


  • Options
    #17
    cgarrad
    Registered Users Posts: 1,611 ✭✭✭cgarrad


    Thanks all, circles is obviously the way to go.

    Not perfect but close enough ;-)


  • Options
    #18
    PrzemoF
    Registered Users Posts: 1,931 ✭✭✭PrzemoF


    An easy way to solve something like this is to use parametric CAD like FreeCAD or get familiar with parametric constrains in AutoCAD


Advertisement