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drafting a curved surface

timjr

New member
Hello,


I am trying to figure out how to create a feature that is basically a curved cut, with the resulting surface drafted. Sorry for a poor explanation, I can emaila file to anyone interested in helping me out.


Thanks,


Tim
 

timjr

New member
I've tried to attach some images to show what I am trying to do. I would like the drafted cut to actually follow the path of the curve I have shown. Any suggestions would be appreciated.


Thanks,


Tim
Edited by: timjr
 

puppet

Moderator
use

sweep -> cut



then select ur curve

draw ur shape that u want to sweep.

presto :)



if not give more information
 

timjr

New member
Thanks, but I tried that first. The problem is that the cut needs to get smaller the farther out it gets, kind of like a cone, but with a slighter angle. Doing this straight is not a problem, but to curve it is another story. Since I can't get the images to upload, I'd be happy to email to anyone willing to have a look.


Thanks,


Tim
 

james.lynch

New member
Got this from a Coach Demo, you should be able to use this principle to buile your geometry..
http://www.cadtrain.com
you can download the files from
http://www.cadtrain.com/courses/wf2_demo/CADTRN-129185/CADTR N/wildfire2/en/umodel/files.html
*****************
Create a variable section sweep feature that represents the left side of the engine nacelle inlet fairing shown below.
Working Directory: adv_modeling


Figure 1
1. Open section_trajpar.prt.


Figure 2
2. Create the Section for the feature.
<UL ="text">
Choose
[/list]
<BLOCKQUOTE>
Choose

Select the large semicircle datum curve </BLOCKQUOTE>





<B ="figure">Figure 3[/B]
<UL ="text">


Choose



Change the thickness value to 0.125


Choose
[/list]





<B ="figure">Figure 4[/B]
To save time and some sketching effort, the profile of the section is already drawn as three datum curves, as shown below. You might be tempted to just use Use Edge to create your section curves. You can use Use Edge to create the curves, but you must then remove the Alignment constraint...if the curves remain Aligned, they will NOT be affected by the trajpar value and will not change size as the section is swept.
<BLOCKQUOTE>
Zoom in on the section and turn Datum Planes and Datum Points off</BLOCKQUOTE>





<B ="figure">Figure 5[/B]
<BLOCKQUOTE>
Choose
and select the three curves </BLOCKQUOTE>





<B ="figure">Figure 6[/B]
The three curves now need to be unaligned. You can do this using the References window.
<BLOCKQUOTE>
Choose Sketch
Choose References</BLOCKQUOTE>
The References window is displayed showing the references for the three curves that have just been created. All three curves reference Curve:F6. These references must be deleted.

Figure 7
<BLOCKQUOTE>
Select each curve reference listed and then choose the Delete action button</BLOCKQUOTE>
As each reference is deleted, a dimension will be applied to the applicable curve.
<BLOCKQUOTE>
Choose the Close action button</BLOCKQUOTE>
<UL ="text">
As shown below, make sure the side curves are tangent with the upper curve and make sure the sketch is dimensioned as shown below[/list]

Figure 8
3. Add the section relation and complete the feature
<BLOCKQUOTE>
Choose Info
Choose Switch Dimensions
Choose Tools
Choose Relations</BLOCKQUOTE>
Notice that when the Relations editor is opened it shows that you are going to be entering Section Relations (in the Look In option menu) and also displays the section name.
<BLOCKQUOTE>
Type in the following relation:
sd13 = ( 1.5 * trajpar ) + 1</BLOCKQUOTE>
sd13, as shown above, may not be the dimension symbol on your part. Use the actual symbol that is the width dimension at the bottom of the section.

<BLOCKQUOTE>
Choose OK
Choose
</BLOCKQUOTE>





<B ="figure">Figure 9[/B]
<UL ="text">
Choose
[/list]




Figure 10
3. Close the part.

*****************
hope this helps..
Edited by: james.lynch
 

puppet

Moderator
IF ur after something abit more simple.

View attachment 602





this was done via

insert -> sweep blend -> cut



and u can adjust the transition from section to section.



but if u want something more accurate VSS is the best way. This still gives the right impression and is much easier to do.



To add more sections just add more datum point's on the curve. or more points on ur initial sketch via a spline curve ,
 

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