part of sketch unconstrained/extends wrong direction

[glovatoQAKQY]

Hello, i'm having an issue with a "simple" sketch that consist of several rectangles joined with chamfers/arcs and an angled section.

The angled section i made a rectangle, used coincident constraint on the bottom right point to the bottom left corner of the  C-shaped piece on top, then filled the top gap with a 3-point arc.

Aftr that i filleted every corner.

The issue is that somehow, that angled portion is unconstrained!, and i have no idea why(changed all the inner part of the rectangles that touched each other to construction lines where applicable).

The second issue that this generates is that i want to extend the bottom 75mm part towards the left, but if i change the length it extends to the right(correctly extending the top parallel part, at least that's ok)!.

And ofc the sketch remains unconstrained 

[jhackney1972 · Accepted solution]

You were missing a few dimensions and sketch constraints.  Model is attached.

[glovatoQAKQY]

John,

I also realized there's an error on the top right, a line is protruding from the fillet!, when i deleted the vertical bit(remnant from the rectangle) and extending part with the trim tool it unconstrained the entire top portion!.

Managed to fix it with the width(3mm) and height(110mm) constraints.

i'm trying to understand the process you used to add those missing dimensions and here's what so far understood:
the 66.174 dimension i can add just fine, that one alone allows me to stretch the bottom 75mm part correctly(half of the initial problem solved!)
the 130° arc i can add as well, but it doesn't constrain anything
the 110mm part gave me over-constraint errors but after i removed that extra bit it did allow me to constrain

But several of them give me over-constraint errors:
the 8mm Y of the end L-shaped part, can't add the width of those portions as well or any of the fillet radii.
i also can't add the bottom fillet as tangents

attaching the f3d to the issue so far:

I can change the bottom length correctly

The entire sketch is black, but the sketch still doesn't shows the red lock

[jhackney1972 · Accepted solution]

I think you need to exercise better sketching practices.  I went through your sketch and recorded some of the poor practices and corrected them.  The sketch is full constrained and lock symbol is showing.  Model is attached.

[glovatoQAKQY]

Wow, i never saw those extraneous lines ¿where did they come from?.

i'll tell you the building process i did step by step:
Built the base rectangle(all rectangles are 3mm thick)
built the right vertical rectangle connected to the bottom one, 110mm tall
then the 3rd horizontal rectangle(29mm) connected to the right one.
I then built a floating rectangle, rotated it 50° and made a point constrain on the "pivot" point.
i then proceeded to build 2 more rectangles for the L shape part(8 and 10mm)
after that i used 2 center point arcs to fill the gaps that the angled rectangle left.
Now i made fillets on every corner

After that i marked some lines left by the overlapping rectangles as construction lines and at that point i pretty much encountered the issues that made me open the thread(i'm super new to F360), i have no idea why those vertical line was left after the fillet, it's like the fillet didn't trim the rest of the rectangle.

i'm following your video step by step to reproduce it to learn more, one thing i didn't quite understood is when you select the construction lines at 2:42, ¿why do you use the END key after selecting it?. If i deleted the line without the END key it would unconstrain the model(deleting the same line), but with the END key before deleting, it didn't do it!.

i'm not surprised at all i have a sloppy construction(still i'm surprised i could make so many mistakes to join 6 rectangles!), i still need to familiarize myself a lot more, extremely thankful for your time