Stretching both the length and radius of the arc

[Anonymous]

Hello everyone! I got a problem creating a dynamic block that can:

1. Length of arc can be stretched >> This is okay

2. The radius of arc can be stretched >> 😞

3. The rectangular box will remains tangent to the arc all the time.

I appreciate if anyone can help me to solve this... Thank you!

[Anonymous · Accepted solution]

So...  Don't know how well you've come along on this.  The best way to do this type of thing is with the Dimensional and Geometric Constraints.  There are also some lines that are not visible to help constrain the parameters. 

There are the Geometric constraints that tie everything together.  A horizontal line to keep them from rotating.  There are 2 lines to help tie the box to the arch.  This line is perpendicular to the box and tangent to the arch with one end point coincident to the middle of the box and the end of the arch.

From this there are 2 Dimensional Constraints, 1 for length and 1 for arch height.