whilst dimensioning a drawing the text size suddenly reduced to barely visible. The existing dimensions were not affected.
Whatever i tried in properties or the dimension edit did not bring the text size to its original size.
Even when i imported a dimension from another drawing it inherited the existing drawing properties and the text became 'unalterable'
Help please 

Look at the text size of relevant text style, size of the text set at text style dialogue has priority before the size of text set in dimension style.

Hey buffalo,
Do you have any dimensions that are correct? If you do, set the dim style to that dimension style, type: dim, space-bar, up space-bar, select the entire drawing and hit space-bar. That command should update all the dimensions to the correct style.
Hope that helps,
nameci

thanks nameciwill try that and let you know how it goesbuffalo 

or use the match properties tool, if available :)

Look what text style is in dimensions properties.Go to Format-- text Style -- see the height of text(That should have fixed value) -- change that value to "0"Edit the text height of desired dimensionsIt should solve the problemTomwww.indovance.com

that did the trick, thanks a lot 'nameci'  

Hey buffalo,
Your welcome, glad I could help.
nameci

thanks for the help, here is another poser, how do i keep my dimensions the same size in different viewports in paper space?

The age old question!!We have a number of different text and dimension sizes, scaled for each scale we use... i.e. 100 sized for 1:100 and 50 sized for 1:200.. etc..  and then use the appropriate text size or dimension size where applicable..Or you can (not recommended) place one size of text on the layout tab...Although we actually use a mixture..  So that drawn elements have their text on the model tab and at the appropriate text or dimension sizing for the scale they are drawn at and then text for Notes, in a separate area are placed on the Layout tab.

Hey buffalo,
I use AutoCAD 2008. If the version of CAD you are using has Annotation, use that. Set you dim style up and make sure you check the Annotation box. In Model Space, in the lower right corner of the screen set the annotation scale to 1:1. Beside that, there are 2 triangular shapes, turn them both on.

In paper space, add the viewports that you need. Select the viewport, go to properties, under Misc, select Annotation Scale, and choose the scale that you want. Repeat for the other viewports.

The dimensions will automatically stay the same and the object will scale to the selected scale.

Hope that helps,
nameci

hi
              i have doubt in autocad.how  autocad drawings change 1:50 scalinig