topic Equal angles for a line between arcs in Fusion Design, Validate & Document Forum

Equal angles for a line between arcs

87asd67zxc — Sun, 20 Apr 2025 08:19:27 GMT

Can't find a way to specify angles for that connecting line. The goal is to make angles A and B equal, but there doesn't seem to be a way to even enter an angle value manually. Help? It's a line connecting two arcs.

Re: Equal angles for a line between arcs

davebYYPCU — Sun, 20 Apr 2025 09:48:59 GMT

If they are concentric then make the line coincident to the centre point.

Might help…..

Re: Equal angles for a line between arcs

87asd67zxc — Sun, 20 Apr 2025 10:01:44 GMT

I think the problem why Fusion doesn't let me assign a numerical angle value at either A or B is because the line's endpoints don't actually "split" the arcs.

Re: Equal angles for a line between arcs

87asd67zxc — Sun, 20 Apr 2025 11:07:10 GMT

That did help! Thanks. Although, would be good to understand why Fusion wouldn't just let me specify angle dimensions.

Re: Equal angles for a line between arcs

davebYYPCU — Sun, 20 Apr 2025 11:32:14 GMT

A Line tangent to the arc at the lines end point, is 90 degrees.

Strickly speaking, two different circles would not have the same angle.

Angle dimension to an arc, is very rare ask.

Use additional construction lines.

Might help...

Re: Equal angles for a line between arcs

laughingcreek — Mon, 21 Apr 2025 03:13:38 GMT

@87asd67zxc wrote:

I think the problem why Fusion doesn't let me assign a numerical angle value at either A or B is because the line's endpoints don't actually "split" the arcs.

no that's not the reason. the reason is because you can't define an angle between an arc (which is curved) and a straight line. angles are defined between 2 straight lines.

you can put construction lines at the ends of the line, and make those tangent to the arc. then define the angle between the line and the tangent construction lines.

Re: Equal angles for a line between arcs

87asd67zxc — Mon, 05 May 2025 18:40:36 GMT

An angle exists for any three points, it doesn't actually need lines, which is why I thought Fusion should be able to do that. But yes, construction lines is an ok workaround for that, thank you.

Re: Equal angles for a line between arcs

TheCADWhisperer — Mon, 05 May 2025 19:16:19 GMT

@87asd67zxc

You only show two points in your original problem description.

Where is the third point?