How do I measure Radius of splines?

[Anonymous]

I want to measure the radius of the spline (S-Curved line). In AutoCAD, the radius is R502 mm , but I doubt it's the same in the Fusion 360, can anybody help to find the radius, I know how to measure the length nor radius.m THANKS 

https://a360.co/2DYTXFP

[TheCADWhisperer]

Can you Attach the AutoCAD *.dwg File here?

Is your Design Intent to do a Revolve feature?

[TrippyLighting · Accepted solution]

There's currently no function in Fusion 360 to do that, at least that I am aware of.

[g-andresen · Accepted solution]

Hi,

currently there is only the function in the inspect tool but no possibility to measure true lengths or radii of splines even not in drawing mode.
For composite curves, app store offers the mSt sketch tools.

If you are interested in such a tool vote in the Idea Station and/or create a new idea

kind regards

günther

[TheCADWhisperer · Accepted solution]

I had not looked at your *.f3d file here before my previous response.

You can make communication easier by using File>Export and then Attach your *.f3d file directly here rather than linking.

I have never heard of dimensioning the radius of a spline in AutoCAD before and would be very interested in learning that technique.

In Autodesk Inventor Professional you can dimension the length of a 3D spline or radius of curvature of a 2D spline. (although I don't know of a way to both dimensions on the same spline)

It appeared to me that you might be doing too much work - turn on your sound.

Let me know if this is of any use.

[chrisplyler · Accepted solution]

A spline does not have a constant radius to be measured. Now, you can use calculus to find the "radius" of a curve at any particular point, but it's a second derivative type equation performed on a function, and as such is an "approaching zero" type of calculation, which is really a "best approximation" situation. Maybe that's what Autocad does? I dunno. But I do know that the splines you used in that sketch do not have a constant radius.

If you want to set that type of shape up with constant radii, use tangent arcs instead.

[Anonymous]

Dear TheCADWhisperer

I appreciate your help and corrections you have on my sketch, that help me a lot to solve the problem. I will use a tangent arc to draw the two curves with radii 408mm. Thanks again for the helpful Screencast.

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@TheCADWhisperer wrote:

I had not looked at your *.f3d file here before my previous response.

You can make communication easier by using File>Export and then Attach your *.f3d file directly here rather than linking.

I have never heard of dimensioning the radius of a spline in AutoCAD before and would be very interested in learning that technique.

In Autodesk Inventor Professional you can dimension the length of a 3D spline or radius of curvature of a 2D spline. (although I don't know of a way to both dimensions on the same spline)

It appeared to me that you might be doing too much work - turn on your sound.

Let me know if this is of any use.

---

---

@TheCADWhisperer wrote:

I had not looked at your *.f3d file here before my previous response.

You can make communication easier by using File>Export and then Attach your *.f3d file directly here rather than linking.

I have never heard of dimensioning the radius of a spline in AutoCAD before and would be very interested in learning that technique.

In Autodesk Inventor Professional you can dimension the length of a 3D spline or radius of curvature of a 2D spline. (although I don't know of a way to both dimensions on the same spline)

It appeared to me that you might be doing too much work - turn on your sound.

Let me know if this is of any use.

---

---

@TheCADWhisperer wrote:

I had not looked at your *.f3d file here before my previous response.

You can make communication easier by using File>Export and then Attach your *.f3d file directly here rather than linking.

I have never heard of dimensioning the radius of a spline in AutoCAD before and would be very interested in learning that technique.

In Autodesk Inventor Professional you can dimension the length of a 3D spline or radius of curvature of a 2D spline. (although I don't know of a way to both dimensions on the same spline)

It appeared to me that you might be doing too much work - turn on your sound.

Let me know if this is of any use.

---