FreeCAD Curved Surfaces the Easy Way | Helicopter Canopy | Protogen Helmet Visor
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- เผยแพร่เมื่อ 27 ต.ค. 2023
- The curved shapes workbench is a extremely powerful workbench in FreeCAD. It allows you to create a loft out of just one profile by utilising hull curves. These curves guide the loft allowing it to morph into shape conforming to the curves supplied. Using this along the path wb we learn how to create a curved array to create the surface and hollow out the inside. The resulting surface is mirrored and we are left with what resembles a helicopter canopy. We take this a step further and create a very simple helmet for cosplay using it as a Protogen helmet visor or a helmet for a dog.
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Another super way to make curved shapes. This great for airfoils and canopies. I wouldn’t have known that cloning and draft would work the way you demonstrated. Thank you!
It's a great workbench so many possibilities. Nice to bring something new to the table. Glad you enjoyed.
I need to try this workbench immediately, wow
We could say, it's a helmet for a dog 😂. Nice tutorial, thank you.
:) :) :) :) Glad you enjoyed
Great tutorial. Your creation in a roundabout way reminds me of a droid's head from Star Wars.
Oh Yes, it's does... I cannot not see that now lol. Glad you enjoyed.
Just awesome! You make things so easy to follow; love it! Please keep these videos coming!
Thank you! Will do! You be happy to know there are going to be more like this 😊😊😊 And one is coming up soon. Thank you for your kind comment.
Another great video to learn from. Thanks keep up the great work.
Great to hear, glad you enjoyed 😊
Hi Darren, Another great Tut, I had a Minor issue with a "Residual Surface on the ZX Plane after the Cut Operation. I'd say it was cause by the B Spline Profile because I redrew all Profiles using End Point and Rim Arcs and it worked a Treat! (Subsequent examples indicate more so not enough Element Profiles causing "Puckering"I've used the Curved Surfaces Work Bench with Imported *.svg of Airfoil Profiles in my Modelling exercises for Wing Models.. A Series on this WB would be Welcome this End. At 28:18 when You use the Shape Binder out of PD Workbench to effect a Revolve of Helmet Rear, I take it this is a "Work Around when a Sketch cant be Used? Seems quite a useful One at That!
Regards,
RW
HA! I was hanging out with a couple protogens last night at a furry party.
Lol legendary comment, love it 😁😁😁
Thanks, but as we've agreed, this again highlights the lack of robust offsets for solids and surfaces that those working with organic shapes need. You had to adjust the x value in the profile offset to not be the same as the y or z offset. This would also be true of the 3D clone offset. Where you don't care about differences in uniform thickness this is not an issue, but for designing injection molded parts where uniform wall is important it is.
As far as mirroring I tend to not split surfaces along a midplane if I can, because even though the tangency at the midplane is the same, the curvature may not be. I defer to using a single surface across the midplane using the B-spline combs to get a more curvature continuous surface between the two sides. Plus, later when you want to use a pad to surface or cut to surface in PartDesign and the profile you're using spans that midplane you'll have to split the profile, because you can only use one surface. This is really particular to FreeCAD where I find the option to pad or pocket to next fails where the same geometry will work perfectly in SolidWorks. Fingers crossed both issues will be resolved in later FreeCAD versions.
Might have to revisit my boat designs.
It's good fun this workbench 😁😁😁
allot of automotive plastic trims are curved in shapes like these. but how would you make an exact curved shaped copy of an original object. I tried to use the curves workbench and nurbs to curved surface, but every time i try to adjust the surface it would crash my drawing
Is there a way in curves workbench to use the edge of one surface to control the tangency of the edge in the surface that will mate along the original surface edge? Using a surface edge control would make your seams between the front and back helmet surfaces seamless.
You could use a blend surface and also in the surface workbench there is a way to control the tangency between surface and other joining objects. Hmm I think that's well worth a video 👍👍
Another cool tool to add to FC. Couple of quick questioms - did you ever make a follow up with mini series part 18 comment. You take a shape and bend it, reverse of the unwrap. I did try the sheet metal bench but really couldn't get ot to work.
Second q is, Is there a listing of your videos with longer descriptions than what TH-cam shows. YT search is not very good at finding very specific videos. Even when you search on the name you get random crap like Russian exersizing videos.....
great video! can you make holes in these shapes using subtractive features?
Thank you glad you enjoyed. Yes you can use the boolean/ subtractive features with any solid you want to use.
The reason you were getting such weird geometry and had to use so many more array entries was because your initial curve was rubbish. If you want a smooth curve, don't trace it using multiple points. Without exception, the more points you have, the worse your curve. Here, you should have just had the start and end points and either a third point that was aligned with both start and end points, or if you need more control, use start, end, and two control points, one aligned with the start, and the other aligned with the end. The distance from the start of the control point linked to the start sets the initial velocity. Similarly, the point linked to the end specifies the end velocity. These velocities control how close to the corner of the rectangle the curve gets. Let the maths do the interpolation, not your eye.
The spacing of the points in your curve gives it different velocities along the curve. The initial velocity at the top, was horizontal, and too high for it to make the curve. It was like you'd set a dragster off on a lap of Silverstone, at the first corner it went way off course, then did its best to get back on track. Rather than fix this by using more divisions, you should treat this as an indication that your curve is rubbish and simplify it. Look at your generated surface, and see how the shading reveals a complete lack of smoothness. That's because, although the curve is continuous, it has changing velocity along the path. The velocity is interpolated smoothly, but the acceleration is not, and the eye can spot this easily. If you had rendered this model with a highly specular surface, and put it in an environment with bright lines along the walls and ceiling, you'd have seen it even more clearly, that the reflection of the lines was not smooth. Educate yourself about continuity. Freya Holmér has an excellent video on the continuity of splines, and is well worth watching.
"Without exception, the more points you have, the worse your curve. Here, you should have just had the start and end points and either a third point that was aligned with both start and end points," I'm a FreeCAD Novice but I think You've made an important Point from a Design Perspective. During this Exercise I found B Spline Profiles and Boundary Curves induced "Puckering in Their Surfaces/ Joins. I experimented with "3 Point B Splines" i.e Start Point, Common Centre Point (Vertically & Horizontally Constrained) and End Point. Multi Point B Splines appear the way to go but open up more problems than they solve, Your Maxim of Minimal Control Points makes Sense.👍
Hello, you have a great a great FreeCAD tutorials video list on youtube. Please try to make some videos on geometry cleanup operations in FreeCAD if possible like the ones at
th-cam.com/video/eAx3opnnTtI/w-d-xo.html
th-cam.com/video/3EEuQ8bJYmw/w-d-xo.html
Is there a dedicated workbench in FreeCAD to perform repair options like Ansys SpaceClaim?
Kind Regards
based