# Thread: How to draw this top arc?

1. Member
Join Date
Dec 2018
Posts
56

## How to draw this top arc?

Desired diagram: 1.JPG

My diagram: 2.JPG

How to draw this top arc?

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2. Moderator
Join Date
Jul 2006
Posts
1,622
The top arc that you've highlighted is actually two circular arcs. Each is R100mm in size. One is concave, and the other is convex. Both are tangent to each other in the middle.

There are many ways you could sketch these arcs with CATIA. I would draw a Three Point Arc and then constrain it's size and position. Then repeat for the other arc.

The "trick" to drawing these arcs, are the centerpoints. The reference drawings shows convex arc centerpoint at 250mm. Both centerpoints are coincident to the vertical lines 85mm (170mm/2) apart.
kingston.JPG
Last edited by MrCATIA; February 4th, 2019 at 09:44 AM.

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3. Member
Join Date
Dec 2018
Posts
56
How can you tell other right side arc is R100?

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4. Moderator
Join Date
Jul 2006
Posts
1,622
Again, these reference drawings are not very good. Since there was no other dimension for that arc, we have to assume all the arcs in that view are the same size.

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