Perpendicular constraints, lines to curves

[domusam]

The title describes the thing. Why is it not possible to have a line perpendicular to a curve? It seems like such an elementary feature, that to not have it makes a mockery of Fusion 360 and Autodesk! (perhaps that's a bit dramatic, but you get the point).

[TheCADWhisperer]

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@domusam wrote:

Why is it not possible to have a line perpendicular to a curve? 

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@domusam 

I have demonstrated how to do this here in the past.

A search might return the discussion thread(s).

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[wersy]

I have never thought about this before because I have never had this situation.
A work around is quite simple. A circle around the desired point gives the intersection points for a chord. From there, as usual, a perpendicular line can be created.

@TheCADWhisperer, is it this what you mean?

[TheCADWhisperer]

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@wersy wrote:

A circle around the desired point gives the intersection points for a chord. 

@TheCADWhisperer, is it this what you mean?

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The chord is not needed in the case of a circle - a line perpendicular to a circle would always point through center.

Simply add a Coincident between the line and the center of the circle.

This connection point can be dragged around the circle and the line remains perpendicular to the circle.

[wersy]

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@TheCADWhisperer  schrieb:

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@wersy wrote:

A circle around the desired point gives the intersection points for a chord. 

@TheCADWhisperer, is it this what you mean?

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The chord is not needed in the case of a circle - a line perpendicular to a circle would always point through center.

Simply add a Coincident between the line and the center of the circle.

This connection point can be dragged around the circle and the line remains perpendicular to the circle.

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Yes, of course, that's right.
Then all that remains is the perpendicular to a curve that is not a circle.

[davebYYPCU]

Your method is used on Splines, here.

Might help

[matthewM5R6M]

How has autodesk not implemented perpendicular constraint to an arc, or circle yet?!?!?!? I could do it on inventor for as long as I can remember, but fusion 360 lacks this?