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How do you fully define a sketch?

Question asked by Kris Carlson on Jul 26, 2010
Latest reply on Aug 9, 2010 by Alan Stoldt

Following a suggestion by Joe Kelchner, ("I suggest breaking down each thing to it's absolute minimum and then model it in a two dimensional sketch and get that to work like it should and then use that as a layout sketch"), I am creating a complete 2D sketch of my new project before doing any 3D work.


On the other hand, Jerry Steiger and told me my sketches should be fully defined ( Attached is a sketch that is underdefined--select for instance the simple inner ellipse in White-SCF-Dura-Ambient (this is the white matter in the spinal cord). Why is it underdefined? How do you diagnose underdefinition? How do you fix it?


Taking a blind stab at defining the sketch further, when I try to fix its center to the origin (which I thought was already done when I created it), it becomes over-defined.


My texts do not really address fully defining a sketch and I had thought it was a good thing to be underdefined because clearly I get error messages when a sketch is overdefined and sometimes have to wade thru many options to fix the overdefinition. Here is what my best text, Planchard's A Command Guide for SolidWorks 2009, says, which seems ambiguous. I know I was naive in thinking an underdefined sketch is good--I just want a set of best practices for fully defining a sketch. Thank you.


" is not necessary to fully dimension or define sketches before you use them to create features. You should fully define sketches before you consider the part finished for manufacturing." (p. 4-17).


btw all suggestions I have received on this forum have been very helpful--I really appreciate them.