Apparent glitch in Sketch can't move underconstrained point or line.

[jeffescott]

Please see component cam:1 sketch cam.

I am trying to edit the top left of the sketch.  There is a blue line connected to an 45 constrained line, extended from the projected line.

I and enter a line and grab the ends or middle and move it around, but as soon as I connect to the constrained line i am unable to move anything about the blue line.

Why????

When I try to change the length dimension of the line it gives the error failed to solve, I can see no constraints added to the line other than the one coincident constraint.

Oh and I have rebooted fusion

Okay I have some green projected lines if a draw a line from a green point the  line is constrained coincident when the line is created and the rest of the line remains free to move, but when I connect to the purple projection, the line is not automatically constrained to the point, and is free to move, but as soon as I make one end coincident to the purple geometry the line is not free to lengthen or rotate about the point?

The sketch has no warnings to review.

Okay so now I can add a line to the purple geometry, and it becomes coincident and can be moved, as is expected, and the dimensions are working again......

No idea what i  did to "fix it" feels glitchy.

[John_Wright · Accepted solution]

This vertical constraint here seems very odd. If you delete it you can move the line around freely...

[HughesTooling · Accepted solution]

Personally I'd say you have way too much in this single sketch the makes it hard for you to debug and for Fusion to solve.

Always try to avoid lines\arc on top of each other like this.

If you delete the circle all starts to work again. Try to avoid symmetry in sketches and mirror the features\faces on the solid and keep the sketch as simple as possible!

[jeffescott]

Thanks guys that helps alot.   I knew it was getting to complicated.   I will start all over again and sort everything out.   I was trying to get to a workable prototype, before the big redo.   Think i can get there, from here. Just need a couple more parts.