×
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

sheet metal twist

sheet metal twist

sheet metal twist

(OP)
i am try to twist a sheet metal component thought 90 deg,i have try many ways but no luck

RE: sheet metal twist

I'm not sure how to do it with the Sheet Metal workbench.

You can do it in the Part Design workbench by drawing two sketches of the start and ending cross-sections (the end will be 90 deg rotated from start), and then use the LOFT to make the twisted solid.

RE: sheet metal twist

(OP)
have try the multi-sections solid defintions using 9 profile but 8 to 9 it all go wrong

RE: sheet metal twist

try using the online help.

I'm not sure why you want 9 profiles (cross-sections)? 2 profiles should be enough to make the 90deg twist. Maybe you don't want constant twisting angles?

RE: sheet metal twist

(OP)
I am not obtaining the twist throught 90 deg with 2 profiles.have try all sort but no luck, it should be simple to twist a 20mm x 3mm through 90 deg.( i am new to catia it's part of a learning curve)

RE: sheet metal twist

I just looked at the help file on Multi-Section solids, and it's not very good. sad

I also tried one and it was pretty simple.

I drew two planes 60mm apart, and then drew the two sketches of the 20x2 cross sections (with one rotated 90deg). In the Part Design workbench, pick the LOFT icon for the multi-section solid. Then select both sketches (for section no 1 and 2), and hit OK. smile

I didn't like the results, cause it didn't have good transitioning at the ends, so I undid it and started again:

Pick the LOFT icon, select the first sketch and then select the plane of that sketch (it shows up in the tangent column), now pick the second sketch and the second plane. OK and you get a good twisted solid. smile

RE: sheet metal twist

Another way to do this without using surfaces is to use the RIB feature. First draw one section. Then make a helix curve from one of the corner points, twisting 90deg. You should be able to now use RIB to sweep the section along the helix. (I didn't try this one, but you get the idea)

RE: sheet metal twist

                                                                   SHEET METAL TWIST
                                

I tried several ways of doing this in GSD and got tbe best result using Loft with 2-Sections and 2-Guides. Without the guides, the transition surface necked in at the middle. Using sections of unit length, the dimension across the twist at the centre was the Cosine of Half the Twist Angle, irrespective of whether the twist was 90°, or any other angle.

Using 3-Sections only, I got a result but it was unacceptable, it's the guide curves that hold the smoothness of the twist. One guide was a Spline through 3-Points with Tangency on the start and finish points. The other guide was a symmetry operation performed on the first.

Another method is to use Sweep, with only 1-Section and 2-Guides.

The picture shows a Thick Surface made from the original twist plus linear ends, joined together.

RE: sheet metal twist

(OP)
Have try helix 80mm pitch and height of 20 give 90 deg twist, and then use the rib tool.

many thank to all for your help

RE: sheet metal twist

After my last post, I realised that the twist can be even simpler and probably more accurate, with minimal construction work. The complete mid, or neutral, surface of the twist can be made from a line and a plane. The line is the linear length of the twist and the plane, in this case XY, is to reference the twist angle from.

Using Sweep and the With Reference Surface option, the line is the guide and the plane is the reference surface, the lengths are equally half the width of the twist and the angle is cotrolled by a S-type law. The straight ends are extruded from the implicit boundaries of the twist, using the original line for direction.

                               

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