×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

OUT DAMN CUSP!

OUT DAMN CUSP!

OUT DAMN CUSP!

(OP)
Crash course in lofting, almost there, but I can't get a cusp out of my surface, it follows the line I noted in the screenshot. SWX won't let me use a guide curve that goes between 2 points on the same profile, which it seems would solve the problem. Any suggestions? Greatly appreciated.

Thanks,

SWX 2010, SP3  

RE: OUT DAMN CUSP!

Those cusps usually occur in a surface when the input is  not smoothly possible.  Generally, if one profile has sharp corners, and the next fillets, SW will "make it work", but not give the smooth surface you were picturing.  I do a lot of surfacing, and the better your linework is, the better your surface.  That said, I have also been amazed at how well SW has done on occasion with pretty bad profiles, and guide curves.  In surfacing, keep trying different techniques, and make sure your surface is mathematically possible and well defined.  Stay with it, and you will find as you gain experience, it gets easier.

RE: OUT DAMN CUSP!

(OP)
So you think it's the 90 degree corner too. Back at it.

Thanks.

RE: OUT DAMN CUSP!

I noticed that you have a lot of unconstrained sketches?
Can you attach your sldprt here?
One approach might be to get it all enclosed - then Knit solid.
Then Delete the face(s) and replace with a filled surface and re-knit.

RE: OUT DAMN CUSP!

(OP)
I've got a million sketches in there, and half a dozen lofts, each using a couple of the sketches and a few guide curves.

Mostly different iterations in the sketch that goes around the top.

I'll have to model a similar case that represents the same problem to keep it safe.

RE: OUT DAMN CUSP!

(OP)
Turned the problem around:
Profiles were the loops around the top and bottom, guide curves connected the two.

Changed it, modeled as a 1/2 section
the lines that were guide curves, made them profiles
used the top and bottom as guide curves, no more cusp.
Made a boundary surface for the fillet that runs out at the end.

RE: OUT DAMN CUSP!

(OP)
I was thinking lady macbeth. Last little bit of blood wont come off her hands 'cause it's in her head.

RE: OUT DAMN CUSP!

Basically, you are trying to cram too much into a two-section loft.  Divide and conquer.

Also, you are using a funky border edge to define your loft.  Reconsider whether these are the curves that should actually define the u-v curves of your loft surface.  Ideally, you would define a loft larger than you need with tamer u-v contours and then trim.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources