Whenever I have a problem to make a sketch fully constrained I use this button to constrain a sketch fully. So far it has not failed. I wish to know whether it is advisable to use this button. Help topic has very limited information about what I need.
I don't use the automatic constraint/dimension button.
Instead I use the following:
Each step requires thought about my design goals, manufacturing requirements, company standards, how I expect the sketch to change as my design evolves over time, and how to structure the web of geometry, constraints and dimensions so that someone else can understand my model at a glance. You will get better at considering all these factors as you gain experience with the tools. I use a similar set of factors as I place and constrain components into assemblies.
I don't use the automatic constraint/dimension tool because it has no knowledge about all the above factors.
Look for the "Show All Degrees of Freedom" command from the Right Mouse Button menu while in a sketch. That will show you the remaining DOF in your sketches and give you some direction for additional dimensions and sketch constraints.
Steve Walton
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Use the Show All Degrees of Freedom tool or JD Mather's vertex drag suggestion to learn where you missed a dimension or constraint. Once you know what geometry is under-constrained, add dimensions/constraints to tie it down. Don't just slap a dimension on a line, think about how that dimension will be used later in the design process and the life of the product.
Steve Walton
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@Anonymous wrote:
...It was my instructor told me use this button.
I don't know whether toor
or get
....
But the fact is - I seem to recall having covered this topic many many times, including videos. I could be wrong, but ....
Did you see me stop - dazed and confused at 4:45 in this thread? I expected the line to be constrained. How did I solve my confusion?
@Anonymous wrote:
Problem is sometimes sketch is dark blue colour that means sketch is near to fully constraint but down right corner side of the window shows still couple of dimensions are needed.
Hi fiatnm ,
In the Automatic Dimension tool you can un-select the Dimensions check box and let it only put on only sketch constraints.
I do use it this way occasionally.
Like everyone else has said, I do not recommend using this tool as a matter of common practice. If you develop proper practices and good sketch and constraining skills the need to use this tool to apply constraints will only arise when trying to work with someone else's poorly sketched mess. 
In this picture it says 2 Dimensions required, but in reality it is 1 sketch constraint.
I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com
