Is Continuous Auto-Dimensioning bad?

posted by Oct 2, 2013 in General Forum by aldogalvino (130 points)
Hey :D I'm a college student and as a part of my Drawing for Engineers course I have been taking classes on how to use NX 8.0. I really like the software and I think I'm really getting the hang of it except for sketches that require to be fully constrained. I found out early on that if I left 'Continuous Auto-Dimensioning' turned on, I would have no problems with my sketches lacking constraints but my instructor says this is wrong and lowers my grades if I sketch with continuous auto dimensioning. My question is, is my instructor right? I obviously know very little of the software since I just started using it about two months ago, but I don't see any downsides to using continuous auto dimensioning. And if so, any tips on how to make my drawings not lack constraints? My instructor also lowers grade if I use the 'Fixed' or 'Fully fixed' constraints. Thanks!

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2 Answers

0 votes
answered Oct 3, 2013 by Ronaldvandenbroek (9,650 points)
Hi.

'Continuous Auto-Dimensioning' isn't neccesarily bad and can come in very handy. The downside is that it will leave you with a sketch which might be constraint complety wrong...
If you place a sketch which needs to be constrained to other geometry you might get un expected results when the "driving" geometry is changed.

There is also no garantee that your geometry is a closed loop. 'Continuous Auto-Dimensioning' isn't checking or arranging for that.
 

Your teacher is trying to teach you how to create a fully constraint sketch and wants to know if you understand the way of working of this feature. So it's of course normal that he will not allow you to use the 'Continuous Auto-Dimensioning' as it will do most of the work for you.

A good way to learn how to manually fully constraint a sketch is to do the constraining on the fly. What I used to do is apply the contraints to each of the skecth entities I placed immediately when I placed them... So instead of completely drawing my sketch geometry and constraint afterwards I did this "on the fly" one entity at the time...ensuring that each line I placed was also fully constraint.
0 votes
answered Oct 24, 2013 by Bubba (190 points)
It isn't that it is bad, however the system is hardly adept at creating intelligent constraits.

Regardless of the cad software the user should always be constraining sketches on their own and not letting the software decide what the constraints should be.

You get lower grades if you use certain functions?? sounds pretty stupid, but then again it is college.

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