define a sketch - beginner help

rlbrk

I'm pretty new to Onshape. I tried to define the sketch of those curves. after a lot of adjustments and play with it, that I did not understand what I'm doing, I got it constraint. 
I would be happy to see how would you define it without hundred of dimensions and constraints. here is a link to the undefined sketch - https://cad.onshape.com/documents/8e52018553fc0c1015216bfa/w/03ccce68d1c39bc2c12859a2/e/2c957f722c7c1e9a16172701?renderMode=0&uiState=6686e3810a5d7b445eda0493
thanks 

james_aguilar160

Just to clarify your question: are you asking, "is there a way to make exactly this same shape with fewer constraints?" Or something else?

robert_scott_jr_

I took a stab at this. The first thing I did was to move the sketch (Transform tool) so that one vertex of the sketch is coincident with the origin thus avoiding all the dimensions relative to the origin. Multiple dimensions were required to define the rest. This included defining the length of the spline handles and ensuring they were horizontal and defining the positions of the vertexes of the left side of the sketch. This left the inner sketch elements undefined but deleting them and recreating the offset to the now defined sketch fixed that. Moving the sketch first was the key to less dimensioning. - Scotty

https://cad.onshape.com/documents/034bb6f45fa66480323240d2/w/2959e44e25e15c1af9bce6a9/e/14c61cf250cfaef0ccfee603

rlbrk

Thanks that is exactly what I needed.
So the main fixes here is to move the sketch to the vertex point and define the spline by the handle lines? 
I really couldn't figure out how to define this spline shape...

rlbrk

james_aguilar160 said:

Just to clarify your question: are you asking, "is there a way to make exactly this same shape with fewer constraints?" Or something else?

how can I define the lower part of the sketch, the spline, and make it black without making a lot of dimensions and constraints 

robert_scott_jr_

I did make it black by doing just that. Seems it is necessary. I suppose it's because a spline is a complex shape. Of course, if symmetrical, you'd only have to define one side and then mirror that. - Scotty