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CAD program origin points?

Discussion in 'CAD' started by Michael, Jun 12, 2006.

  1. Michael

    Michael Guest

    I have a simple little freeware CAD program for doing chassis etc. that I
    like called A9CAD.

    The one thing I'm not clear on with regard to the software though is the
    "point of origin" in the piece you're working on.

    Let's say for the sake of simplicity that I'm drawing a simple 6" x 6"
    aluminum rectangle with a couple of holes in it.

    The starting point of the drawing (the origin point?) is the bottom left
    hand corner with all the measurements taken from there.

    The problem is....with this software that I use (and I've see this in other
    programs also).....is that, if you want the origin point at X=0 and Y=0 then
    you have to draw starting in the middle of the screen.

    This is a pain because the zoom and view options are few and I have to
    scroll the drawing all the time.

    What I would like to do is start the drawing at the very left hand corner of
    my drawing screen (which would show
    negative values for the X and Y starting point).

    My question is.....

    As long as my drawing dimensions are what I want, does it matter to the DXF
    information that is being exported or the fabrication house that this
    "origin point" is NOT at zero? Would the DXF file be ok to read
    regardless?

    THANKS
     
  2. Ned Simmons

    Ned Simmons Guest

    I can't imagine it would be a problem. Your part will probably not be
    set up with its origin point at the (0,0) of whatever equipment it's
    running on, so somewhere along the line an offset to the corner of your
    part will need to be determined anyway.

    Ned Simmons
     
  3. John2005

    John2005 Guest

    Hi Michael,

    I usually try to put the origin point somewhere on the part, because it
    makes it easier for the CNC programmer to program the part. However,
    with most cad programs it is very easy to either move the part to the
    0,0,0 origin, or to move the coordinate origin point to the part (you
    can do it both ways in AutoCAD). So, the CNC programmer may have an
    easy way to put the part wherever he/she wants.

    I would think most shops could handle it either way without too much
    trouble, but you should try to make it as easy on them as possible, and
    locate the origin somwhere on the part, usually at an important datum
    or reference point.

    Hope this helps.
    John
     
  4. JR North

    JR North Guest

    You should have 2 sets of coordinate readouts. 1 set for cursor
    {FROM}origin and one set for current active drawing operation from
    initial point X. No? Poorly written program. Zoom should be slaved to
    the cursor position and + - keys. No? Poorly written program. Origin
    should be shiftable to any cursor position with a {shift/X} keystroke
    function. No? Poorly written program.
    DXF doesn't care what, or where the "origin" of the drawing is.
    "Origin" is a reference point for the objects in the drawing, and for
    the cursor position. It is not a specified absolute as to relative
    position to the drawing (IE: left/lower corner).
    JR
    Dweller in the cellar

    --
    --------------------------------------------------------------
    Home Page: http://www.seanet.com/~jasonrnorth
    If you're not the lead dog, the view never changes
    Doubt yourself, and the real world will eat you alive
    The world doesn't revolve around you, it revolves around me
    No skeletons in the closet; just decomposing corpses
     
  5. ATP*

    ATP* Guest

    Sounds like you are wasting your time using a freeware program with limited
    capabilities- why not acquire an old version of Autocad for next to nothing?
     
  6. Michael

    Michael Guest

    Thanks JR....I'll look into that although the setup feature seem to be
    limited.

    I'm getting the hang of this program better now....maybe a bit hasty in my
    post......like any other software the "more you use it"...etc

    Actually, I didn't choose it because it was freeware, I had bought some
    other programs and for an infrequent user like me the A9cad is really
    decent.

    Especially considering I can get a DXF file out of it.
     
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