Circle from three lines

[Anonymous]

Can i build a circle out of 3 lines.

[AliasJB]

If you mean out of 3 curves, yes you can.

In the Circle options, turn OFF periodic, and you can specify the number of segments, the degree and spans.

3 curve circleCircle options

[Anonymous]

Hi

Thank you for the effort.

I wanted to build a Circle which is Tangent to 3 Lines. These lines are in a single Plane. The simplest example would be 3 sides of a square.

Best Regards

Sadat

[systembolaget]

Use AutoCAD for such kind of 2D drafting tasks, then do the 3D model in Alias.

[Anonymous]

Thank you for a replying which is kind of tangent to my query.

And if I have to use AutoCAD for these small things then the whole set of tools in Alias where we have 3 point curve, tangent to curve, perpendicular to curve are just drafting tools which are not supposed to be in Alias. Please raise a ticket to remove those.

The situation is not in 2 dimensions as you are thinking. For the sake of simplicity I explained it in 2D.

When I have 3 surfaces which are like the 3 sides of a cube and I want a fillet which is tangent to all surfaces I have to build a curve and then the surface as Alias is not having any command where i can build it directly by selecting the surfaces.

Thank you.

[systembolaget]

Attach a file so it's possible to understand what you really mean.

The few very basic 2D tools in Alias are certainly not made for drafting. I have never seen anyone outputting an ISO/DIN compliant drawing.

[Anonymous]

Hi

I can only attach a sketch of my problem.

If I am unable to clarify the situation then we have to wait till Monday.

Thank you in Advance

Happy Easter

Best Wishes.

[AliasJB]

I suppose in your situation you could use Curves > Keypoint Curves > 3 Point Arc

3 point arc

[AliasJB]

"And if I have to use AutoCAD for these small things then the whole set of tools in Alias where we have 3 point curve, tangent to curve, perpendicular to curve are just drafting tools which are not supposed to be in Alias. Please raise a ticket to remove those."

Now I see that's exactly what you don't want.  If your attached surfaces are flat (as they appear to be in the sketch), I think you'll have to hand build it.  I don't believe there's an automatic way to do this.

[systembolaget · Accepted solution]

If the lines form a square, there is exactly one circle that fits, for each circle can be inscribed into a square; use a circle of the diameter that matches the square's height/width.

If the lines don't form a square, one can solve the algebraic equations or construct it "manually". Draw two lines that bi-sect the angle between two pairs of lines. Where these intersect is the centre of your circle. The radius of the circle is obtained by dropping a perpendicular line from the bisector intersection point as shown.

Greetings from the Easter bunny!

[Anonymous]

Hi

3pt curve does not give me the exact Position where it is Tangent.

[Anonymous]

Hi

In context 1 it is easy to get Tangent passing through all the sides.

But in Context 2 i cannot do it easily.

Any ways i did it by using ICEM where it can build a circle when we select 3 lines.

Thank You

[Anonymous]

Here i took help from ICEM colleagues to create curves and then imported into Alias.

Thank you

[duaxiong]

Yes...sadly, this is something that Alias has not ever been able to do.  It's frustrating when you have a target size that you HAVE to hit.  You end up having to put a point on that line...a point you don't necessarily want.

[systembolaget]

Well, you don't have to do anything other than I described to make a circle tangent to three lines in a plane. It's actually very simple. Even in Alias ; )

[Anonymous]

Hi

Yes the Suggestion you have is good.

For a given Situation of 3 lines nomatter whether it is a part of a cube or Rhombus or trapezoidal, we are gonna have one circle of certain constant radius Fitting in that Corner for each Situation.

So i suggest Alias can have a single command to achieve this.

The method suggested by Systembolaget, to do bit of construction in 2d is possible.

Thank You