shell loft

[kevinlamers]

Hi.

I'm not sure if this is the right place to post, correct me if I'm wrong.

I have a little problem:
I've created a few sketches on several planes. (Airfoils of a wing)
The sketch includes and off set. so that i have the shape of the carbonfibre skin. Now I would like to create a loft of the 5 sketches containing the carbon skin shell. But any time I try to do this, solidworks makes a solid of it and no shell. This is weird because I only select the outer shells when making the loft.
I also tried to make a shell of it afterwards but than solidworks is still closing one end of the wing. (like it's a box, but it should be like a tube).
Extruding isn't an option to get rid of the last wall because every airfoil is different so the wing isn't a simple extrude.

I would be very thankful if someone could help me.

Kevin

 

[ttraser]

I've had this before as well. things to check, all sketches have the same amount of entities. when selecting sketchs, use same location for origin. or create a series of offset entities and another internal loft, create a fill surface for the end, sew and create solid.





good luck ...

 

[michael3130]

Kevin,


Could you loft it as a surface and then thicken? This should work.

 

[gorhen]

are you using a lofted surface from surfaces toolbar?

 

[michael3130]

Yes, that was my suggestion. Then it can be thickened.


Sorry I can't be more specific, it's just I'm in work and only have ProE here. I can check it later at home if necessary.

 

[kevinlamers]

Thank you for your great help.

The lofted surface idea sounds good. I will try it tonight, first I have to study for some exams.

Maybe, I can also try to make a solid of the outer dimensions and subtract the loft of the inner dimensions.

One little question:
SW is awfully slow when I'm making a loft. It can take several minutes per sketch I've to select. The sketches contain about 200 points each, so maybe it's quite complicated for the software. My PC has a dual 2.5 ghz, 4gb of ram and a nvidia quadro fx 570m.
Is this normal, or is there something wrong with my settings.

Kevin

 

[michael3130]

The sketch sounds quite complicated. Post the part if you want and I can have a look at it later .


Complicated lofts do tend to be quite heavy on memory but it sounds like you have a good machine. I'm not an expert on the hardware side though.

 

[kevinlamers]

You can download the file here:
It is the part with just the sketches for the skin.
http://www.popitula.com/temp SW/Copy of Wing skin.SLDPRT


Edited by: kevinlamers

 

[michael3130]

OK, I'll give it a go later and come back to you.

 

[kevinlamers]

Michael, I've converted my many-points-sketch into a spline (spline fit), now it's less complicated. I than did the offset. Now I want to at the straight part at 1/4th of the leading edge (as you can see in the drawing I send you). But when I draw the straight edge on the spline, SW wont let me trim away the original piece of line belonging to the spline. When I zoom in very much I can see the lines aren't attached to the spline and I can't get them to touch each other.
I've added the file with the spline.
http://www.popitula.com/temp SW/splines.SLDPRT
Thank you,
Kevin

 

[kevinlamers]

Small update:
First making a lofted surface and than thicken it, works great (and much faster). Now I still have to know how to fix my spline issue. Because I really need that flat edge at the location of the spar.

 

[michael3130]

Kevin,


Glad it's starting to come tiogether for you. I'm still in work and wont get looking at it until later. I should have asked, what version of SW are you using as I'm on 2006. If you're on a later version, maybe you could post some pics here or put an IGES file (using lines and/or surfaces) on the website.

 

[maggien]

OK, I'll give it a go later and come back to you.

<br style="color: rgb(0, 0, 0);">I will also follow your all instruction.. ..
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