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Thread: Constraining a sketch (blue)

  1. #1
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    Default Constraining a sketch (blue)

    I have a question guys. I am getting back into inventor this time "for real" as I need to learn it for a job. I remember from some time ago that when drawing a 2d sketch it was said that all the lines in the sketch needed to be constrained (blue) ?

    Can someone please tell me how true this is and why is it important?

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    Default Re: Constraining a sketch (blue)

    In parametric design - any sketch that is underconstrained is unpredictable.

    Fully constraining sketches also gives inventor less to think about, which might improve performance.

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    Default Re: Constraining a sketch (blue)

    Quote Originally Posted by Paul Munford View Post
    In parametric design - any sketch that is underconstrained is unpredictable.

    Fully constraining sketches also gives inventor less to think about, which might improve performance.
    So would it be safe to say and it is not necessary to constrain sketch if the part will not be parametric?

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    Default Re: Constraining a sketch (blue)

    I guess not. In that case it might be just as well to select all the geometry and use a 'fix' constraint to lock it down.

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    Default Re: Constraining a sketch (blue)

    Quote Originally Posted by Paul Munford View Post
    I guess not. In that case it might be just as well to select all the geometry and use a 'fix' constraint to lock it down.
    let me understand something. If i have a square, and I lock the top horizontal line, then I dimension to the opposite side (bottom( , if I were to make the part parametric, the dimension would push the bottom side within an assembly and keep the top line fixed. If that correct? Otherwise if the top line were not locked, the square would grow or shrink based on the center (origin) of the sketch?

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    Default Re: Constraining a sketch (blue)

    That's correct. Usually, the first sketch in a model is constrained to the centre point to keep it stable. Hint - you'll need to protect the centre point into the sketch.

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    Default Re: Constraining a sketch (blue)

    Use as many geometric constraints as possible, and as little dimensions in a sketch as possible. I've found that designs respond better in assemblies when there are only a few dimensions.

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    Default Re: Constraining a sketch (blue)

    is there a way to move objects in assemblies in a pressie manner? - BTW thank you for the advice.

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    Default Re: Constraining a sketch (blue)

    Quote Originally Posted by crullier View Post
    is there a way to move objects in assemblies in a pressie manner?
    Yes, move them the exact same way they are in the real world - use assembly constraints. Use constraints, use constraints, use constraints.
    There is another way, but I believe in using constraints.

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    Default Re: Constraining a sketch (blue)

    I appreciate that. I understand constraints but I need to look further into them. However my question was more along of the lines of taking something apart to look at it. Lets say I want to move a part 10" to the bottom so that is it out of the way.

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