AutoCAD MEP General Discussion

AutoCAD MEP General Discussion

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Distinguished Contributor
jmcfaddn
Posts: 399
Registered: ‎12-01-2003
Message 1 of 8 (77 Views)

Problems with orientation when placing new duct fittings.

77 Views, 7 Replies
08-12-2003 04:32 AM
On page 154 of the text it shows a Takeoff Position Tab on the Duct Fittings Properties dialog box. My ABS2004 does not have this tab???? When placing new fittings I always have problems trying to get it positioned properly to line up with the proper connections. For instance right now I am trying to place a rectangular duct beveled tap, I cannot find a way to spin it 180 degrees to get it orientated in the right direction.
*Bernhardt, Kyle
Message 2 of 8 (77 Views)

Re: Problems with orientation when placing new duct fittings.

08-12-2003 06:17 AM in reply to: jmcfaddn
Think that the flow direction in the duct defines
the orientation of takeoff.  Try changing that.


--
Kyle Bernhardt
Mechanical Engineer
Dagher
Engineering
29 Broadway
New York, NY 10006
Distinguished Contributor
jmcfaddn
Posts: 399
Registered: ‎12-01-2003
Message 3 of 8 (77 Views)

Re:

08-12-2003 06:39 AM in reply to: jmcfaddn
already tried that, didn't work.
*Popiel, Slawomir
Message 4 of 8 (77 Views)

Re:

08-12-2003 10:39 AM in reply to: jmcfaddn
I've found that the takeoff direction is related to
the direction in which you draw the duct. Or at least that applies to the
cases when you draw takeoff from the trunk. If you draw it from the diffuser
towards the trunk, the takeoffs will be in opposite direction.

Then more pizzas: If you try to draw a takeoff from
the vertical section of a trunk. by some reason it will be neither with the flow
nor opposite; just 90 degrees to the trunk centerline. same applies if you
attempt to make bottom tap to the diffuser with beveled takeoff.

sp

 

 


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

Think that the flow direction in the duct defines
the orientation of takeoff.  Try changing that.


--
Kyle Bernhardt
Mechanical Engineer
Dagher
Engineering
29 Broadway
New York, NY
10006
*[Autodesk], Bo Noren
Message 5 of 8 (77 Views)

Re: Problems with orientation when placing new duct fittings.

08-12-2003 03:56 PM in reply to: jmcfaddn
Hi Jody,

 

Beveled fittings are unfortunately not rotated
according to the flow direction when they are placed:-(

If you are placing the fitting using the Add
Fitting command you can use the rotateY option on the command line to rotate the
fitting 180 degrees.

 

You can also use the Duct Fitting Property
command to rotate it afterwards. Use the Flip Y option in the Takeoff Position
OR Anchor tab. (It seems like the Anchor tab is displayed instead of the Takeoff
Position tab if the fitting have been placed by the Add Duct tool.)

 

 

Hth

/Bosse

 


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
On
page 154 of the text it shows a Takeoff Position Tab on the Duct Fittings
Properties dialog box. My ABS2004 does not have this tab???? When placing new
fittings I always have problems trying to get it positioned properly to line
up with the proper connections. For instance right now I am trying to place a
rectangular duct beveled tap, I cannot find a way to spin it 180 degrees to
get it orientated in the right direction.
Distinguished Contributor
jmcfaddn
Posts: 399
Registered: ‎12-01-2003
Message 6 of 8 (77 Views)

Re:

08-12-2003 11:32 PM in reply to: jmcfaddn
I did get it to rotate, thanks.

But, the logic for rotation is messed up, and this has always confused me. In a standard model plan with the X-axis: horizontal, the Y-axis: vertical. I have a rectangular duct running vertically on my screen, along the Y-axis. I have a rectangular beveled tap on the left side of the duct. Ductwork from this tap extends along the X-axis running right to left on my screen. The Beveled tap is facing up, the wrong direction for the the actual airflow. If I could use the mirror command I would mirror the fitting around a horizontal line parallel to the x-axis. Therefore, one would rightfully believe that if I want to rotate this fitting into the proper orientation it should be rotating around the X-axis. The way AutoCad has it, I have to rotate it around the Y-axis, which makes no sense???? What is the logic to this?
*[Autodesk], Bo Noren
Message 7 of 8 (77 Views)

Re:

08-14-2003 12:09 AM in reply to: jmcfaddn
Yes, I agree that it is confusing and it can be
hard to rotate the fitting the way you want.

 

The coordinate system that you rotate the fitting
around is the coordinate system of the duct (Entity Coordinate System) that the
fitting is attached to; where the X-axle is the duct direction. The reason
for that behavior is that the fitting is attached to the duct using an
anchor and are moving with the duct.

 

 

/Bosse


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
I
did get it to rotate, thanks.

But, the logic for rotation is messed up, and this has always confused me.
In a standard model plan with the X-axis: horizontal, the Y-axis: vertical. I
have a rectangular duct running vertically on my screen, along the Y-axis. I
have a rectangular beveled tap on the left side of the duct. Ductwork from
this tap extends along the X-axis running right to left on my screen. The
Beveled tap is facing up, the wrong direction for the the actual airflow. If I
could use the mirror command I would mirror the fitting around a horizontal
line parallel to the x-axis. Therefore, one would rightfully believe that if I
want to rotate this fitting into the proper orientation it should be rotating
around the X-axis. The way AutoCad has it, I have to rotate it around the
Y-axis, which makes no sense???? What is the logic to
this?

*[Autodesk], jason martin
Message 8 of 8 (77 Views)

Re:

08-14-2003 11:29 PM in reply to: jmcfaddn
For a graphical example of the Entity Coordinate System that Bo is talking
about switch to a 3D view, then go to display manager and turn on (for the
current display config) the General display of the Anchor Free object.

The anchor display is a little UCS icon for each ABS object, where the X
axis has 1 arrowhead, the Y 2 and the Z 3.

jason

"Bo Noren [Autodesk]" wrote in message
news:06946D3C9D1B2ED565BF7552A858340C@in.WebX.maYIadrTaRb...
> Yes, I agree that it is confusing and it can be hard to rotate the fitting
the way you want.
>
> The coordinate system that you rotate the fitting around is the coordinate
system of the duct (Entity Coordinate System) that the fitting is attached
to; where the X-axle is the duct direction. The reason for that behavior is
that the fitting is attached to the duct using an anchor and are moving with
the duct.
>
>
> /Bosse
> "jmcfaddn" wrote in message
news:f18090a.4@WebX.maYIadrTaRb...
> I did get it to rotate, thanks.
> But, the logic for rotation is messed up, and this has always confused
me. In a standard model plan with the X-axis: horizontal, the Y-axis:
vertical. I have a rectangular duct running vertically on my screen, along
the Y-axis. I have a rectangular beveled tap on the left side of the duct.
Ductwork from this tap extends along the X-axis running right to left on my
screen. The Beveled tap is facing up, the wrong direction for the the actual
airflow. If I could use the mirror command I would mirror the fitting around
a horizontal line parallel to the x-axis. Therefore, one would rightfully
believe that if I want to rotate this fitting into the proper orientation it
should be rotating around the X-axis. The way AutoCad has it, I have to
rotate it around the Y-axis, which makes no sense???? What is the logic to
this?
>
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