Fusion
The technique I use is sketch drag. Try dragging any of those blue curves, and you can see what is constrained together, and that can help you figure out what constraints need to be added. I'll take a look at your sketch in a bit and see if I can show the technique.
Jeff Strater
Engineering Director
Fusion should really be flagging this as over constrained but I guess all the dimensions have just overwhelmed the solver. If you have a right angle triangle with 2 equal lengths you should only need 2 dimensions to fully constrain it.
Not only have you dimensioned 3 sides and a 45° angle but on all three side you have a second set of dimensions (in affect dimensioning the line length twice). I guess you started with the triangle, if that's constrained with just the two 6.124" dimensions, if at any point it changes to unconstrained you have a problem.
You can see starting with a triangle and 2 dimensions you're fully constrained.
You are also adding to the complexity using 2 collinear lines when you could use a single line. Just add a point at the intersection if you need to dimension the intersection. If I was you I'd start again from just the triangle, add lines and fully constrain at each step and if you run into a problem like the main triangle changing to unconstrained come back here with the new design.
Mark
Mark Hughes
Owner, Hughes Tooling
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Forgot to add, if you try fixing this design rather than start again you have something odd going on at the bottom corner. If I window select the corner with delete active it selects 16 points, not sure how you ended up with this!
Mark Hughes
Owner, Hughes Tooling
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the suggestions by @HughesTooling and @g-andresen are all good. The first problem seems to be those "point stacks" where you have 2 or more points on top of each other. Fix those first. Focus on getting that construction triangle fully constrained, then work top/down on the rest of the sketch. You will have lots of angle dimensions, but will need more than that.
Jeff Strater
Engineering Director
After cleaning up your sketch, removing duplicate geometry and adding a few construction line to help with symmetry I get this.
Fully constrained, file's attached for reference.
Mark
Mark Hughes
Owner, Hughes Tooling
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