10 Replies Latest reply on Apr 19, 2011 2:45 PM by Emil Tietje

dimensioning spring diameter

I have a drawing of a helical spring in which it is displayed end-on.  The spring has squared and ground ends.  I'm trying to dimension the outside diameter of the spring, but it won't let me select those edges.  I think I need to convert entities, but I'm not sure how.  Does anyone know how to do this?

I'm using SW 2010.

Thanks,

Brian

• Re: dimensioning spring diameter

You could sketch a line across your spring, dimension that line, then move it into a layer that's turned off to hide it.  Someone else will probably have a better way but this will work.

• Re: dimensioning spring diameter

Post the spring in a drawing - simple version - just the spring.   I would like to see what it is that is the problem.

WT

• Re: dimensioning spring diameter

Here is a .jpg of that view - I put lines and a dimension on.  Those extension lines for the .109 dimension are just sketch lines that I placed there to show what I want.  They are not tied to anything.

• Re: dimensioning spring diameter

did you create this using a helix?

if so, insert the model dimensions used to define the helix diameter or other appropriate dims...

• Re: dimensioning spring diameter

Ok, the problem is that SW can't convert that helical edge into the proper projection.  The only thing I have found is to put on the lines as construction lines and make them tangent to the edges.  They will stay correct because they are tied to the geometry.  Now that being said, I don't know why lines will relate buut dims won't.  So, your ext lines are almost there - just add the tangent relations.

WT

• Re: dimensioning spring diameter

Do you have a sketch circle entity in the part file that represents the outside diameter of the spring?  If you do, and the sketch is used to define a feature (such as the helix that drives the sweep for the spring), you should be able to use insert>model items>dimensions in your drawing and bring the dimension in.

Yeah, what David just said.

• Re: dimensioning spring diameter

After the first time, I learned to draw springs with additional features for mates and dimensions.  Usually I create ID and OD circles as construction entities in the sketch that drives the helix.  The ID and OD are spaced by a third circle that is linked to the wire diameter.

I also always include an axis up the middle and datum planes for each end.

• Re: dimensioning spring diameter

Since it not is possible to convert the edge of a helix I suggest to do a sketched circle with an equation for the diametre.

The helix diameter + the thread diametre.

This circle could then be used for dimensioning in the drawing.

• Re: dimensioning spring diameter

Ok, I inserted model items for the dimension in my earlier post.  For some other dimensions I did what  Sven said.  Thank guys, I greatly appreciate the help from everyone.  You guys are life-savers.

• Re: dimensioning spring diameter

I have a similar problem with the dimension of a spiral part.  I would like to dimension the diameter and the pitch.  The drawing removes all the sketches that were used to build the part.  The part will be fabricated from a flat pised of sheet metal.  It would help if I could provide the flat pattern.  I have no experience in building sheet metal.  I tried to use a helix with a thin line.  Could not get it to work.  Thanks in advance for the support.  David Tg

PS  Drawings attached.  Not sure if the pack and go worked