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How do you dimension a diameter on a line?!

kiarian_coohillkiarian_coohill Member Posts: 16 EDU
Fundamentals 3 - Exercise: Coffee Cup
Fallen at the first hurdle here. I can't figure out how to dimension this 125 diameter. It's a line. How do I go beyond the line to change the dim to a diameter?
I've read the hint, and I still haven't figured it out.

Comments

  • kiarian_coohillkiarian_coohill Member Posts: 16 EDU
  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 2,454
    Place the dimension text on the other side of the centreline as shown in the picture. 
    Neil Cooke, Director of Technical Marketing, Onshape Inc.
  • kiarian_coohillkiarian_coohill Member Posts: 16 EDU
    edited January 2018
    NeilCooke said:
    Place the dimension text on the other side of the centreline as shown in the picture. 
    Got it. 'To the vertex indicated' threw me. Started to think was it the blue vertex, seeing as all the other vertices were black.
  • kiarian_coohillkiarian_coohill Member Posts: 16 EDU
    OK. Can you tell me what's going on here? Why the slanted dimension line?


  • michael_mcclainmichael_mcclain Member Posts: 180 PRO
    Double check if your centerline is vertical. Hit show constraints in the dialog and check for the vertical constraint. I think the dimension is slanting to follow the line angle. I cant see what else it would be following.
  • kiarian_coohillkiarian_coohill Member Posts: 16 EDU
    I just redrew it in the end. Both lines were horizontal.
  • calvin_georgecalvin_george Member Posts: 3
    Fundamentals 3 - Exercise: Coffee Cup

    I am new to CAD and I am stuck! I cant figure out how to get the diameter on the mug, I've managed to do this one the wheel exercise but cant figure out how to do it again.
  • Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,398
    @calvin_george

    See the "centerline dimension" section of this page:
    https://cad.onshape.com/help/Content/sketch-tools-dimension.htm

    To do this type of dimension, you'll first want to click the dimension tool, then click the point you want to dimension, then click the centerline, then move your mouse across to the other side of the centerline, then click one last time to place it.  The key here is to move your mouse across the centerline after selecting both the entity to dimension and the construction line you want to use as a centerline.
    Jake Rosenfeld - Modeling Team
  • jakeramsleyjakeramsley Member, Moderator, Onshape Employees, Developers Posts: 587
    Fundamentals 3 - Exercise: Coffee Cup

    I am new to CAD and I am stuck! I cant figure out how to get the diameter on the mug, I've managed to do this one the wheel exercise but cant figure out how to do it again.

    Hi calvin_george,

    The trick to getting the diametric dimension is to select the construction line first, then the point you wan to be the diameter, and then to place the dimension on the opposite side of the construction line.

    1. With the dimension command active, select the construction line


    2. Select the outer point on the cup.  This will start doing a horizontal point-to-line dimension.  But don't place it yet.


    3. Before placing it, move your cursor to the other side of the construction line.  This will give a diametric constraint.

    Jake Ramsley

    Director of Quality Engineering              onshape.com
  • calvin_georgecalvin_george Member Posts: 3
    Awesome, got it. Thanks!
  • calvin_georgecalvin_george Member Posts: 3
    @jakeramsley have another question. i cant seem to remove inside of the cup without removing all of it, please see screenshot and tell me where I'm going wrong.

    Thank you in advance

  • Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,398
    @calvin_george

    The selection you are using for the revolve is the entirety of "Sketch 1".  You should de-select the whole sketch (space bar or clicking the x next to that selection), and instead select just the inner area by clicking on it.
    Jake Rosenfeld - Modeling Team
  • andrew_southenandrew_southen Member Posts: 9
    I'm slowly working my way through the tutorials, & rather than start another thread, thought I'd add to this one. The issue that I'm having is with the handle elipse sweep. I've generated the reference plane sketched the elipse on it, I can select the path, but not the face/shape to sweep. Here's a link to the document, if I've managed to get that right. It would be great if someone could point out where I'm going wrong. :blush:  https://cad.onshape.com/documents/2fd59cfa1a9ef6641bca419b/w/b8bb2469ab8472de9183e16f/e/56205343ab57480d4f0149e1
    I had a similar issue with the bottom dia dimensioning, I could get the top to work, ended up adding another small construction line at the bottom to get the dia dimensioning to work there. 
  • andrew_southenandrew_southen Member Posts: 9
    I'm slowly working my way through the tutorials, & rather than start another thread, thought I'd add to this one. The issue that I'm having is with the handle elipse sweep. I've generated the reference plane sketched the elipse on it, I can select the path, but not the face/shape to sweep. Here's a link to the document, if I've managed to get that right. It would be great if someone could point out where I'm going wrong. :blush:  https://cad.onshape.com/documents/2fd59cfa1a9ef6641bca419b/w/b8bb2469ab8472de9183e16f/e/56205343ab57480d4f0149e1
    I had a similar issue with the bottom dia dimensioning, I could get the top to work, ended up adding another small construction line at the bottom to get the dia dimensioning to work there. 
    Sigh. Solved. Redrew it from scratch, same result. Couldn't select the elipse profile. Turns out you have to select it from the features list, not click on it in the scene. Any idea how many hours it took me to figure that one out?  https://cad.onshape.com/documents/1d9c09963a6963df98f2366c/w/24db867fedfc85f360317ca0/e/b1b1fa4614fe4fb8ce96b670

  • NeilCookeNeilCooke Moderator, Onshape Employees Posts: 2,454
    @andrew_southen you may have been trying to pick the edge of the ellipse. To sweep (or extrude etc.) a solid you have to pick the shaded face of the ellipse (or pick it from the feature list if there is only one profile in your sketch). Picking a profile edge is for sweeping a surface not a solid.
    Neil Cooke, Director of Technical Marketing, Onshape Inc.
  • andrew_southenandrew_southen Member Posts: 9
    NeilCooke said:
    @andrew_southen you may have been trying to pick the edge of the ellipse. To sweep (or extrude etc.) a solid you have to pick the shaded face of the ellipse (or pick it from the feature list if there is only one profile in your sketch). Picking a profile edge is for sweeping a surface not a solid.
    Right. How do you pick the elipse face? From the scene in the sweep mode? I couldn't manage to pick anything from memory. The edge would highlight in standard 3D viewing, but as soon as I went into the sweep dialogue, I couldn't seem to select it. Sorry for the newbie questions
  • Jake_RosenfeldJake_Rosenfeld Moderator, Onshape Employees, Developers Posts: 1,398

    @andrew_southen

    Make sure you are in "Solid" mode, and make sure that the "Faces and regions to sweep" box is the currently selected box.

    If you are in "Surface" mode, it will only allow you to select edges, because edges are swept into surfaces.  If you are in "Solid" mode is will only allow you to select faces, because faces are swept into solids.

    Then click on "Sweep path" and select your path.

    Hope this helps!
    Jake Rosenfeld - Modeling Team
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