Techdraw - Dimensioning at contour curves with asymmetric radii

[maker]

Hi all,

when drawing asymmetrical contour radii I encountered the following problem, for the dimensioning of the radius sections usually tangents are needed. I could not find an automatic function for this in FC. Unfortunately, I could only help myself by drawing them in a separate sketch "underneath".
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contour_asymmetric_radii_comm.png (20.64 KiB) Viewed 1380 times

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My question is now:
Could an automatic function be programmed for this, which can be switched on and off?

curves_asymmetric_radii.FCStd

(32.33 KiB) Downloaded 31 times

[chrisb]

Please elaborate. I don't understand what you mean by "asymmetric radii" nor do I see a TechDraw page in your file, which could have helped to better understand.

[maker]

I added the TD page in my file.

What I mean is e.g. :
You have a symmetric contour radius:
R20 = x20 y20

An unsymmetric contour radius:
R20 = x17, y23

For dimensioning the unsymmetric radii, TD cannot supply any intersection points.
They can only be very elaborately inserted by cosmetic vertex (points) and are usually inaccurate.

missing_ intersecting_points_c.png (18.95 KiB) Viewed 1371 times

[Shalmeneser]

Do you know Sketcher_ConstrainTangent ?

I don't understand unsymmetric contour radius.
A fillet has ONE radius.

For TWO radius, you need TWO arcs :

[maker]

??

I'm talking about ONE radius!

[Shalmeneser]

what is the meaning of : R20 = x17, y23 ?

[maker]

The dimensioning of the radius in x- respectively y-direction.

[0mer0]

Are you trying to dimensioning the tangent points between the arc and the straight lines?
Usually what is dimensioned are the coordinates of the center of the arc and its radius.

[user1234]

I could not find an automatic function for this in FC.

See:

2023-01-15_17-15.png (176.1 KiB) Viewed 1297 times

Just said, that have nothing to do with symmetry. The term you search is intersecting points.

Usually what is dimensioned are the coordinates of the center of the arc and its radius.

Depends, i know many controls of CNC, they need only the intersection points and fillet radius. Besides that the intersecting points can be need for any other things in drawings and documentations.

Greetings
user1234

[Shalmeneser]

You need to use an ellipse's arc.