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Feature requests for centre lines: projection lines and driving dimensions

Two suggestions for features regarding centre lines:

First, give centre lines the 'projection line' property toggle, like ordinary lines. That's what appears to be happening in the diagram in the online help under 'Projection lines.'

Second, and probably more controversial..

I know the issue of using driving dimensions has been asked before, but I personally wish that maybe it could be revisited. Yes, the position of the centre-line relative to its elements is driven, but setting up a driving dimension workaround is rather horrid, at least how I've done it:


Create a layer for hidden constraints (which I now have as a matter of course in all my drawings Smiley Sad);
On that layer, draw a line connecting the two elements for the centre line, and normal to it;
Draw another line normal to the first, and intersecting at the first's midpoint (should be automatically colinear (not as a relationship, though) with the centre line);
Add the driving dimension to the resulting manual 'centre' line.


Messy. Maybe there's a simpler way to do it. But it sure would be simpler, and more intuitively obvious, if the position of the centre line, and hence its referenced elements, could be driven directly. It'd be more like a mirror axis for its elements.

Thanks!
2 REPLIES

Re: Feature requests for centre lines: projection lines and driving dimensions

Ken,
See my comments below.
Regards,
Rick B.
"Ken@Coar.Org" wrote in
message news:KenCoar.Org.4d4ito@noreply.bbsnotes.ugs.com...
>
> Two suggestions for features regarding centre lines:
>
> First, give centre lines the 'projection line' property toggle, like
> ordinary lines. That's what appears to be happening in the diagram in
> the online help under 'Projection lines.'
>

The image you see in for Projection Lines in help is displaying lines.
The lines have a centerline type of style. these are not centerlines.

> Second, and probably more controversial..
>
> I know the issue of using driving dimensions has been asked 'before'
> (http://bbsnotes.ugs.com/vbulletin/showthread.php?t=19844), but I
> personally wish that maybe it could be revisited. Yes, the position of
> the centre-line relative to its elements is driven, but setting up a
> driving dimension workaround is rather horrid, at least how I've done
> it:
>

Are you trying to dimension to the midpoint of lines?
Use the Distance Between command instead of the Smart Dimension command and
locate the midpoint of the line to be dimensioned.

>
> - Create a layer for hidden constraints (which I now have as a matter
> of course in all my drawings Smiley Sad);
> - On that layer, draw a line connecting the two elements for the
> centre line, and normal to it;
> - Draw another line normal to the first, and intersecting at the
> first's midpoint (should be automatically colinear (not as a
> relationship, though) with the centre line);
> - Add the driving dimension to the resulting manual 'centre' line.
>
>
> Messy. Maybe there's a simpler way to do it. But it sure would be
> simpler, and more intuitively obvious, if the position of the centre
> line, and hence its referenced elements, could be driven directly. It'd
> be more like a mirror axis for its elements.
>
> Thanks!
>
>
> --
> Ken@Coar.Org
> ------------------------------------------------------------------------
> Ken@Coar.Org's Profile:
> http://bbsnotes.ugs.com/vbulletin/member.php?userid=93335
> View this thread: http://bbsnotes.ugs.com/vbulletin/showthread.php?t=42671
>


Re: Feature requests for centre lines: projection lines and driving dimensions

[ Edited ]

> First, give centre lines the 'projection line' property toggle, like
> ordinary lines. That's what appears to be happening in the diagram in
> the online help under 'Projection lines.'

The image you see in for Projection Lines in help is displaying lines.
The lines have a centerline type of style. these are not centerlines.


Understood. Centre lines have bounded lengths. What I'm requesting is a way to turn on the 'project an infinite reference line' feature that normal line segments have. (And turn it off as well, obviously. Smiley Happy )


> I know the issue of using driving dimensions has been asked 'before'
> (http://bbsnotes.ugs.com/vbulletin/showthread.php?t=19844), but I
> personally wish that maybe it could be revisited. Yes, the position of
> the centre-line relative to its elements is driven, but setting up a
> driving dimension workaround is rather horrid, at least how I've done

Are you trying to dimension to the midpoint of lines?
Use the Distance Between command instead of the Smart Dimension command and
locate the midpoint of the line to be dimensioned.


No, I'm not trying to dimension to the midpoint of a line. I'm trying to dimension to the midpoint/centre line between lines. (I'd include a graphic here if I could believe it'd come through, but I don't see any graphics or attachments on any posts regardless of what they say -- I'm coming in through the Web interface.)

Let me try a line drawing. The colons represent a centre line (A'B') between lines AB and CD.


A'
A : C E
+--+---:---+------+
| | : | |
| | : | |
+--+---:---+------+
B : D F
B'


I want to put a driving dimension between A'B' and EF, such that if I change it, the AB and CD lines will move accordingly.


A'
A : C E
+------+---:---+--+
| | : | |
| | : | |
+------+---:---+--+
B : D F
B'



Is that any clearer?

Thanks!