Circle measurements in Drawing

[tkeskina]

Hi,

I have 3D drawing of case which I want to make 2D CAD-drawings from. So I've made 2D drawing from it.

I have yet to be able to locale holes properly. I can add dimensions for the diameter, but when I try to add dimensions that would actually locate the whole I can't get snap-on to proper place. I've tried with/without centerlines and I can get the whole center end located just fine, but when I try to set the other end, the case edge, it just won't snap on it. It'll snap on to case corner, but that's no use. I also get it to snap on the end of the centerline but not to actual drawing.

I would imagine it shouldn't be this hard so what I'm doing wrong? I've tried the automatic dimension tool as well as all the other manual ones, but I haven't got the result I want.

I've noticed same thing when the whole is seen from side so you see the edges of it (and you can add the center). I can measure the diameter just fine, but can't locale the center accurately. Snap is all over the place, but not perpendicular to case edges.

In screencast it seems to snap on the intersection, but it's off since the dimension should be 4.00 not 4.03.  

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

What if you select these two points instead?

The center of the circle and then endpoint of the line?

 

Are you sure that your two circles are concentric?

[cmiller66]

Hi tkeskina,

The dimension you created is not correctly associated to the drawing view, you'll see that yellow ! icon which indicates something is wrong.  Centermarks are associated to the circle they are placed to, so a vertical dimension placed to these points should also reflect the correct dimension:

The single dimension tool (the one you are using) can create linear (horizontal or vertical) as well as aligned dimensions, and the type created will depend on how the cursor is dragged out after picking the points or geometry.  It is hard to tell from the video without trying it myself but I'm guessing something is not quite aligned right and you're getting an aligned dim instead of vertical.

You can also try the Linear Dimension tool from the Dimension drop-down and see if that works for you:

Please let me know if that works for you.

Thanks,
Chris

[tkeskina · Accepted solution]

I got the automatic dimension tool working when first clicking the center of the circle and then for second point go 'through' corner and not directly to edge of the case. Still, there is that yellow exclamation mark and googling it seems that the measurement isn't associated with geometry. I need to manually associate it to the corner and then it's working how I wanted it to work. Bit extra work, but for now I'm okay with that.

[TheCADWhisperer]

In your video you appear to be trying to track back to an intersection of the object line and center point.

You don't need to do that.  Simply select the center of the circle and the corner point and place your dimension(s).

[tkeskina]

I tested that and you are right! It was just bit confusing because when you go to corner it gives you distance to corner point so I of course assumed that that's what it's measuring but you can actually select what to measure after you've clicked second time(the corner).

Oh well, I have lot to learn but one slowly I'm getting it!