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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: 1,516
    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 12
    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: 111 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: 940
    @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: 542
    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: 940
    @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
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