Trouble getting blue lines to turn black

Ran into other issues with my first attempt to follow the video instructions to recreate the 3 bolt flange, so I went through it a second time more carefully. This time, right at the end, most of my outer curves turned blue and I can't seem to figure out how to make them black again. Please help.

Probably a silly question, and it's been a long time on different CAD packages, but usually different colours are a result of accidentally clicking a different layer.

There should be an option to select the line properties if you (right?) click it, that should show the layer and colour selection.

My understanding is that black indicates they are defined and allows completion of the 2D sketch in order to proceed to 3D. However, I cannot figure out why they remain blue and how to fix this. Additionally, I just began a third attempt at this exercise and this time am stuck at the very beginning as the 'equal' function is not working for setting the three bolt holes equal to each other...?

Now, in my fourth attempt at this exercise, this is the point I am stuck with blue lines and an error message about being over constrained...although I believe I followed every step according to the video lesson and applied the dimensions and equal constraints appropriately. Please help!

Hi Chris,

you're right the black lines show those parts of the profile are fully defined. Blue lines are not defined so can be moved, dragged around or changed unintentionally. It's not a requirement to fully define the sketch, it's just best practice. You can still make a 3D body from an undefined sketch.

Attempt 1-2, i'd try adding a concentric constraint between the 3 large outer curves that form the main circle. This means the centre of each curve is at the same point, so if they are equal radius they should form parts of a circle.

Attempt 3, the equal function won't work because you've already given each circle a dimension. Since the program thinks the circles should each be these dimensions, it can't then make them equal. This would give you an over-constrained error. an easy fix is to click the dimensions you don't want, hit delete, then use the equal constraint to the one that is the correct size.

attempt 4, there's all sorts going on here, the end of the lines that have the white circle are not connected to the other parts of the profile. Looks like you might have been a bit off-target with the trim tool when you were removing sections. Can't tell exactly why you are getting the over-constrained error without knowing what your last action was.

hopefully this helps,

Connor