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
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RE: sheet metal twist
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
RE: sheet metal twist
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
RE: sheet metal twist
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.
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.
RE: sheet metal twist
RE: 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
many thank to all for your help
RE: sheet metal twist
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.