Tip of the Day: Matching Sketch Origin to Part's

Discussion in 'SolidWorks' started by Mike J. Wilson, Aug 21, 2004.

  1. Getting the red 2D-sketch origin back to the part's origin when
    they don't match up is a mystery that's been solved.

    I have no idea if this will ever be useful, but someone asked me
    this once, so I found an answer.

    The 'red' sketch origin represents the 0,0 point (i.e. the 2
    dimensional X, Y) of the sketch itself, which is separate from
    the part's origin.

    Another way to look at this would be...

    *) Start a new sketch
    *) Draw something, with no releations to the part's origin
    *) Go to Tools-> Sketch Tools-> Modify
    *) Move the sketch somewhere else

    You will see the red sketch origin move. Now if you hover your cursor
    right over the red sketch origin, you will see in your status bar that
    it reads 0, 0 or very close to that.

    Anything you draw from now on will be offset from the red sketch origin.
    Try drawing a line and click on the endpoint. Look at your property
    manager. The X, Y parameters are there to edit. Guess what point in space
    those numbers relate to? The red sketch origin... not the part's.

    OK, the big question... how in the heck do you get the red sketch origin
    back to the part's origin???

    The only way I know how, is to do this...

    *) Enable 'Origins' so you can see the part's origin
    *) Draw a sketch point anywhere, whith NO relations
    *) Click the sketch point and in the Property Manager,
    change the Parameter coordinates so that X and Y both
    read '0'

    *) Now your sketch point is exactly at the red sketch
    origin. Cool you're almost there!

    *) Enable "Snap to points" in your document options (this
    is the top secret hint)

    *) Go to Tools-> Sketch Tools-> Modify
    *) Place your cursor over the red sketch origin until you
    see the usual 'inferencing' symbol

    *) Click and Drag the red sketch origin to the part's origin
    *) Hover for a second or two until it 'snaps' into place

    That's it! Your origins now match up. At least it works in 2004 SP4.1

    Mike Wilson
     
    Mike J. Wilson, Aug 21, 2004
    #1
  2. Thanks Mike, there's a mystery solved. I did happen to notice after
    going through your methods to get the origins back together that the
    command Tools->Sketch Tools->Move or Copy, moves the sketch elements
    without moving the origin. This brings me to the question, why would
    Tools-> Sketch Tools-> Modify be allowed to move the origin. What
    possible advantage would moving the Sketch origin away from the part
    origin have?

    Mike Brusich
     
    Michael Brusich, Aug 21, 2004
    #2
  3. The only thing I could think of, is that back in the olde days, when
    people would import 2D sketches from other CAD packages, there
    were always 0,0 origins for them.

    SolidWorks may just be maintaining the integrity of the 0,0 origin,
    so that there is always a reference point to measure things from,
    when looking from a standpoint of original design intent.

    Mike
     
    Mike J. Wilson, Aug 22, 2004
    #3
  4. Mike J. Wilson

    Alain Guest

    Mike,
    I give up!
    I've tried and followed your instructions to the letter.
    Put a unconstrained point in the sketch; changed its coordinates to
    0,0 and it moves to the sketch origin (not the part). SFSG.
    Then when it comes to moving the sketch, I grab the point and move it
    towards the part origin. But only the point (a "black" looking origin
    covers it) moves. It doesn't move the rest of the entities, and the
    red origin of the sketch stays….
    I have tried all the options in the small Modify Sketch dialogue box,
    to no avail.
    If I leave the default selection in that box (scale about sketch
    origin), then the all sketch
    Including the point and the "black" origin moves, but it's impossible
    to locate accurately to the part origin… Can you put me out of my
    misery! I feel so dumb…
    No big deal but can you assist? I find this tip very useful for some
    circumstances.
    SWX 2004 sp 4.0.
    Love those renderings (chrome parts)…. So much to learn… so little
    time!
     
    Alain, Aug 23, 2004
    #4
  5. Ah yes. Move the black origin out of the way, then you should
    be able to move the red one.

    Mike
     
    Mike J. Wilson, Aug 23, 2004
    #5
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