Tangential dimensioning

[PeterPNoster]

Hello,
Is there a funtionality in TechDraw to create a dimension parallel to a line, ending at both sides tangentially?

tangentially_parallel_to_line.PNG (37.07 KiB) Viewed 4173 times

[bitacovir]

Hello,
Is there a funtionality in TechDraw to create a dimension parallel to a line, ending at both sides tangentially?

Is it not equal to a vertical dimension?
https://wiki.freecadweb.org/TechDraw_Di ... cal_Extent

[chrisb]

Is it not equal to a vertical dimension?

Not if the radii are different.

You can add cosmetic vertices, but I'm afraid you have to position them manually or you have to calculate their positions.

[PeterPNoster]

Hello,
In Creo it works like that:
Select bow 1 and 2, then tell the measurement line that she must be parallel to the relevant line.

Forum_Creo.PNG (12.29 KiB) Viewed 4124 times

[reox]

I think this is really hard right now... I wrote a small macro to calculate the points on circles which are parallel to a given line (here: the two points are parallel to the selected third line)
However, we can IMO not create a dimension, because dimensions are parallel to X or Y or the vector connecting the two points.
Hence, this would only be possible if we had a dimension which can be parallel to a given vector.

screenshot-20200505_21041588705469.png (33.11 KiB) Viewed 4065 times

Please have a look: https://github.com/reox/FreeCAD_macros/ ... re.FCMacro

[PeterPNoster]

Wow, reox,
Almost there.
Sorry, I can't support you, in making the dimensioning line parallel to the selected line direction.

[reox]

Maybe wandererfan can help here, but I guess that without major changes it is not possible to store a direction vector for the Distance measures?
However, each distance measure could be written in that form, i.e. for two points p1 and p2, the distance in direction d is |d dot (p2 - p1)|, if d is a unit vector.

[PeterPNoster]

I suppose that it does not help that much, when we constrain the spec to explicit SheetMetal usage.
Where one has allways a tangential connected bow to a line...

[reox]

Actually, it is possible to fake it:

screenshot-20200507_12001588845637.png (42.52 KiB) Viewed 3911 times

Simply calculate the point which is parallel to the selected edge, with the length of the distance between the points in that direction.

I updated the macro to create the two cosmetic vertices.

[chrisb]

Can this be integrated in the regular TechDraw workbench?