perpendicular constraint of line to arc/circle and spline

[cekuhnen]

line tangent arc spline works

line perpendicular to arc spline does not

face palm 😉

[roambotics_scott]

Lucky that you can at least do a geometric construction there but that should definitely be built in

[cekuhnen]

@roambotics_scott With a circle you can draw form the center of the the circle or a make line colinear to the this line.

but this does snot work with a spline

[roambotics_scott]

Draw tangent -> draw line perpendicular to tangent 🙂

[cekuhnen]

@roambotics_scott

I could also draw a circle

draw a line from center circle with 1/4 of the radius

add a perpendicular line with 1/4 radius

and then draw a line till it is tangent

now onto the end of that line I can draw a perpendicular line to the line and thus the circle

so many ways to do it 😉 or just use a simple line and a constraint 😉

tangent does also not work with splines at all.

[roambotics_scott]

Not trying to Daniel Yall you there - perpendicular constraints should just be baked in (actually think I put in an ancient idea for those at some point)

[cekuhnen]

@roambotics_scott Oh there were so many ancient ideas for logical and common basic tool but you know so many different industries use Fusion so they cannot make it fit for everybody.

Crazy how engineers and designers do not need a perpendicular to circle and perpendicular + tangent to a spline tool.

hehehehe ...

[roambotics_scott]

Here we go https://forums.autodesk.com/t5/ideastation-request-a-feature-or/perpendicular-to-curve-constraint/id...

2 votes ‽

July 2014 ‽

Archived

I know Fusion can't make it fit for everybody, but this is something that shouldn't even need to be an idea. It should go

«you should add constraint X»

[done]

-> «what other constraints could we add ?»

-> long list of obvious constraints in backlog (including this) that slowly get baked in

yet it seems to be more like

«you should add constraint X»

[lots of time passes]

[maybe constraint X gets implemented, but without any obvious generalisation beyond it]

[kb9ydn]

This is a really good question that I've always wondered about.  Even Solidworks doesn't have a direct perpendicular constraint for line to arc or line to spline.  You have to make a tangent construction line first and then make your line perpendicular to the construction line.  It wouldn't be something I use super often but it's common enough that I've thought about it on several occasions.

C|

[roambotics_scott]

Maybe I'm just weird, but as soon as I saw that you could do a tangent constraint, I immediately wanted constraints for the normal and cross-product 

[kb9ydn]

Cross product would be interesting for full 3D sketching, that is if we had full 3D sketching. 

C|

[roambotics_scott]

We can dream 🙂

[HughesTooling]

 For a circle or arc you can add  a coincident constraint to make a line perpendicular, just select the line then the arc centre.

With a spline you're stuck because you can only add a tangent at the ends

Or may be at a handle.

Just spotted you can add a perpendicular line to a handle,

Mark

[cekuhnen]

@HughesTooling

In deed the line can be made coincident with the circle center and the end point can be made coincident to the arc.

That works - not really sure if this is logical or smart. Coincident is like G0 positional and the line with the first coincident is not G0 to the arc center. This is more colinear in this sketch while using coincident.

Spline handles are not such things you can pull out - you can also align things to them 😉

but I am talking about a line tangent or perpendicular to a spline and a spline can only be G1 to another spline

and not a line G1 to a spline.

If you look at the Rhino drafting toolbox it make Fusion and SW as an engineering tool look kinda silly.

[HughesTooling]

I'm not against the idea I put the request for perp to a circle in the ideastation a while ago.

http://forums.autodesk.com/t5/ideastation-request-a-feature-or/better-constraints-and-dimensions/idi...

Mark

[cekuhnen]

@HughesTooling

"12-11-2014" this is what makes me sometimes want to give up ...

But that trick you showed me works well. I used a line coincident from the center and the target line coincident on the arc

then the target line is colinear to the line from the arc center.

Your approach is a step shorter.

but this will confuse students a lot - because this makes no sense and is a terrible workaround (both)

2014 .. well maybe in 2018 we get what others have since not sure the 90th?

[roambotics_scott]

There's definitely progress being made but what's disheartening to me is the rate - especially when it comes to the last 10% of things.

I constantly get the impression that the team is more interested in building out just enough to demo but not at all worried about sanding down all the rough edges

[cekuhnen]

@roambotics_scott I am not stating that they do not do work behind the closed doors. Far from that. I think in many areas they are quite great at what they do. But I agree with you - the finish line for the "mission accomplished" button is often not crossed.

[HughesTooling]

Some of Fusion's constraints are a bit different to other CAD programs. Being able to have a line coincident with a point it doesn't touch seems odd, seems like that should be collinear.

Another odd one is being able to add a horizontal\vertical constraint between 2 points, although it is useful for symmetry without needing to draw any construction lines.

Horizontal and vertical constraints between the origin and midpoints on the lines.

Mark

[roambotics_scott]

Don't get me started on symmetry 

[cekuhnen]

@roambotics_scott@HughesTooling

Just checked AD Inventor. Of course there you can do all this

line tangent or perpendicular to an arc or spline - no problem ...

Somebody said they keep Fusion on purpose limited - sometimes it feels this is some truth to it ...