Lengthening a blade

[Terminus0]

Hey I've been having trouble figuring out what to do about a modification I need to make to a part.

It's a turbine blade that I need to lengthen the bottom of the blade without lengthening the top. Normally this would be easy as I could just go into the original loft that created it and mess around with it. However this is an imported file and I don't have access to the original.

I'm not allowed to post the file so don't ask. However I did make a terrible paint drawing to illustrate what I'm trying to do.

I've tried using a loft but I get alot of errors with self intersecting geometry and zero width geometry. I then used a loft cut to try to make a flat section so that I could then so then do a regular loft. It worked but is ugly and leads to some weird geometry that will make our job much more difficult in the future.

Is there a way I could just to tell it to only create a solid where there isn't already a solid? That would make things much much easier.

 

[CorBlimeyLimey]

Can you make a copy of the file, cut away most of the 'proprietary' stuff, save as a parasolid & post that?

Without having the part to play with, I would suggest creating the needed wireframe shape, and then create surfaces from that.
The wireframe can be created by extending sketch geometry using the Intersection Curve tool with strategically placed planes & surfaces.
Start with the needed curve/line from tip to base, and extend the intersected curves to suit.

 

[Terminus0]

Here is a cut down version.

Hope this helps

 

[rstupplebeen]

I believe "Replace Face" is what you are looking for. After that the hard part is constructing the geometry needed for the replace. Please see the attached picture and in the next post the model. I hope this helps.

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[rstupplebeen]

Part

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[Terminus0]

Solid Works won't allow me to open your part file, I have Solidworks 2010.

 

[rstupplebeen]

Does the picture explain clearly enough?

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[Terminus0]

Kind of, I wish I could see the surfaces you made to do that, I keep getting a self-intersecting geometry error when I try to do it.

 

[Terminus0]

Also when I tried replace face on curved faces it didn't work, as opposed to working swimmingly with planar faces. Am I doing something wrong?

 

[CorBlimeyLimey]

Are you looking for something like this?

 

[Terminus0]

I've tried everything but I just keep getting terrible geometry self intersection errors.

 

[CorBlimeyLimey]

Are you wanting to make the blade longer (from hub to tip) or wider (across the blade section, but tapering from hub to tip)?

 

[Terminus0]

I'm extending the blade out and trying not to change the blade angle. The cross section of the blade at the tip should remain the same but the bottom most cross section the leading edge of the blade should be lengthened by somewhere north of a fourth of an inch.

 

[CorBlimeyLimey]

So something similar to the image I posted on the 2 Oct 12 22:48 ?

 

[Terminus0]

Pretty much

 

[CorBlimeyLimey]

Take a look at the Deform function. Maybe the Curve to Curve option will work for you.

http://help.solidworks.com/2012/English/solidworks/sldworks/hidd_dve_deform.htm

 

[Terminus0]

I could never get the deform function using curve to curve to work. Is it supposed to work with a solid face to a surface?