Can't figure out why I can't constrain this sketch

[tim.lavelle]

Hey all... Happy holidays! 

I'm working on a building a new aluminium backplate for my Ender 5 Plus to mount a E3D Hemera on and while I'm referencing a back plate from another design, I'm modifying so I can fit the extruder directly on versus mods. 

I've got the base sketch done, but I've got two tangent arcs that are still blue and I can't seem to constrain them properly. In the image below, I want to be able to adjust the length of the top line while I work on the correct placement on my printer, and everything else moves to the right. The yellow highlighted area is the one I want to stretch with the top line adjustments. 

I've attached my f3d file for reference as well in case anyone needs to look at it in more detail. 

Thanks in advance!

[TrippyLighting]

I personally would not cerate the sketch that way. But to constrain it as is Only one dimension has to be added. Its easy to see when dragging around at the center of that arc.

 

[tim.lavelle]

Thanks Trippy! If there's a better way, I'm all for it... I was referencing another design which I like and was using projections to help get dimensions correct. 

[TheCADWhisperer]

---

@tim.lavelle wrote:

If there's a better way, I'm all for it...

---

Are there any repeated dimensions?

Are there any dimensions that cannot possibly be manufactured/measured in the real world?

What do you notice about my sketch?

One rectangle.

One circle.

Two lines.

Done!

[tim.lavelle]

Thanks @TheCADWhisperer - That is indeed a very elegant solution and showed that I was again, over complicating things. Really appreciate the insight and help from you and @TrippyLighting, you guys are always very helpful!