Can I draw an arc tangent to two circles?

SketchUp
1

Hi everybody.

I’m trying to do the shape related to this exercise:

But I’m having problems drawing the arc tangent to the two circles.
I’ve tried two ways:

  1. Drawing a guideline 72mm size from the top of the big circle as reference and then drawing the arc.

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  1. Drawing an arc with 72mm radius and then trying to snap it to the top of the big circle.
    EDIT: I uploaded the same image twice, now it’s ok.

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nosuccess2707×346 4.11 KB

I had no success with any of the methods I tried, I’m probably doing something wrong.

This is my skp: EjerBas05.skp (33.0 KB)

Thanks in advance.

2

I think this is my best try but it’s still not perfect. Radius is 66,91 to make it match.

mybest

3

Look at

It has various tools to make ‘true’ tangents, fillets etc, and sidestep the limitations of SketchUp’s segmented circles/arcs…

1 Like
4

Thank you so much.
I’m going to try it.
I knew about your extension and I also tried but I probably chose the wrong option.
I’m going to try it again, I will let you know if I’m not able to do it by myself.

5

I give up xD

6

Why ?

7

The extension is awesome and offers more than I probably could need , but I don’t find any way to draw that arc using it.
I tried it with tangential arcs, [arc+line] but I didn’t get it. In fact, I think I tried all possibilities.

8

Can you attach a simple SKP of what you have so far, so someone might help ?

9

Have a look at this video.

EjerBas05_ecati.skp (33.3 KB)

1 Like
10

Thank you so much guys.
@TIG let me record a video and upload it to youtube. I will show you what I tried.
@ecati it worked like a charm.
worked

11

I probably will regret showing this video, but this more or less almost everything I tried (I tried more combinations).
I just upload it to show you that I tried it, I very thank you all the help you offer to me and I understand I also have to try it by myself with some pieces of advice.

If you want me to share some .skp I don’t know which one to upload, I think the one in the first post is the one still not messed up at all.
EDIT: I also tried it with circunferences that are not intersecting but with no success and with a circle and a line.

12

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