FreeCAD: How to Model a Twisted Part
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- เผยแพร่เมื่อ 15 มิ.ย. 2024
- Using FreeCAD we learn how to make a twisted part. Originally from a viewers question we learn two workflows to create such a model. The first workflow uses curves and part workbench and the second workflow use similar tools in the surface and part workbench. We also learn how to convert a model to a shell and a solid.
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I did the same just with feature » the loft tool
Some magic for grown up Freecad users to play with.... Thanks
Great tips there. I was thinking gordon surface but you showed me that a ruled surface can do the job.
Really gratefull. Wonderful.
Thank you so much
Great teaching from you and cool learning for me. Thank you 🙂
My pleasure! Glad you enjoyed and thank you for the kind words
Neat how to 👍. That has solved a problem of what I tried to model for a freight wagon's shunter step which has a twisted stanchion between the wagon floor and step platform.
Thanks for sharing what your going to use it for. Always interest what people can use the workflow for.
Cool timing. I recently saw a bracket like this on an ancient piece of equipment and surmised that you don't see brackets like that so much any more because everything is CAD now and they're quite hard to design in CAD.
Thanks for sharing this information, always interested in what people are looking to use the videos for. Glad you enjoyed 😁
Thanks for bringing in awesome concept of Curve and Surfaces workbenches. Just a small thing to bring up... centers are not matched, it should result in "+" on Left view (you may need to offset by -2 for each on z and y axis individually.
Glad you liked the video. Lol yes, around a day or so I uploaded the video I liked at it and thought, there's something wrong. When i extruded I should of selected the symmetrical checkbox. As you say you can offset the sketch.
Can you show more examples of Twisted Part? It's very interesting
Looks to me as though you've produced a mirror image of the part shown in the original tech drawing.
Man this is awesome watching your videos! Are you a creator of FreeCAD? Wow, I don't understand all you are saying, but there is no need. Just copie and all is good. Fantastic, I must say.
Hope to see a lot more of the 3D printing collection. Cause that's where my road is heading to! But making my own stuff with your know how is great. Are you by any chance capable of making figures with FreeCAD aswell? Just asking for s friend 😂😂😂 brilliant dude. Absolutely great stuff!
Glad your enjoying the videos, no I am not one of the creators but I first started out training to be a teacher so it helps with trying to get the knowledge across.
With figures it all depends how complex they are. You would normally go to a direct modeller such as blender as it has tools for surface modelling allowing you to push and pull the surface to shape your model. Blender has a sculpt mode where you first block out the form and use sculpture tools as if you was modelling clay. Sculpture along with something called grease pencil is something that I am looking at learning in the future 😊😊😊
I would start with the twisted section on this one. I'd use the parametric curve FP macro to make one rail, rotate it 180 to get a second, ruled surface between them, 3d offset a surface 2mm, offset that -4mm making it solid, then add the tabs with the holes afterwards. I believe this method is more accurate on the width and thickness.
These were the macro parameters I used: {"helixblend": {"a": "pi / 4 * (1 - cos(pi * t / 25)) #theta", "b": "1", "c": "1", "d": ["1"], "X": "10 * sin(a)", "Y": "10 * cos(a)", "Z": "t", "t_min": "0.0", "t_max": "25.0", "interval": "0.1"}}
There is an easier way to do this. Start with the cross-section and do the twisty part first. Use 5 cross-sections (copy-paste-offset-rotate). The cross-sections at the end are inline and relatively close to each other. The one in the middle is rotated 45 degrees. Then loft thru them. Not sure if this is clear enough. I might have to do a video on it.
If you took a real one of these made of metal and cut it at its midpoint, would the cross section be a true rectangle? Or would the twisting process deform the metal into a four-sided shape, two sides of which are not necessarily straight lines? If you can say yes to both of these questions, your idea is sound.
@@darryllcrook376 a) it doesn't specify metal necessarily and b) you can make the cross-section of the 45 degree be any four-sided shape you want, like say a parallelogram.
@@haysoos123 Correct. You can also add more cross-sections with different sizes if someone wants to be more precise, but from my experience, in a production environment the twisty part is not critical to create a drawing of the part.
@@imoldovan Part of the problem is that the cross section in the middle isn't supposed to be rectangular, If you draw a line around the flat bar until the line meets itself, and then twist the metal, that cross section will also get twisted, the short ends will tilt in opposite directions. So if you take a new flat cross section, it will no longer be rectangular.
@@sleepib Not only that, but the material stretches more at the edges than in the middle when you twist it, so that the thickness of the part is thinner towards the edges. It all depends how accurate you wanna be. At the end of the day, your boss will not care about that. All he wants is a drawing that the quality can inspect the critical dimensions with. That is my main point. :)
Hi , Deron . Thank you for another great video . I've been for you guys , Just curious if you found a place to live yet ? If you have how do you like it ??
Warmest Regards
Terry Lembke
Hi Terry, Glad you liked the video. We have found a place but we are waiting on the paper work. It's a lot more expensive than we was hoping to pay but hopefully we will be able to make ends meet. Hope you are doing well. Take it easy Terry. Kind regards
I did all good. But when I want to fuse the two extrudes with the solid I get the error: Body: object is not allowed. How to fix it? Thanks!!
Hi, did you manage to find a wy int partDesing WB? I personnay don achieve the continuity on surfaces
Is this item true to the plan? It would be very easy to rotate the wrong way and have your extrude on the back of your part. A symmetrical extrude would have less chance of going wrong and have less chance of operator error on non-symmetrical joining of parts with different sizes.
Pressing of parts that were once cast is becoming more popular for high volume cheap items. Is it possible to un-design a 3D part to a flat surface? All the best with your move and remember the laundry and the kitchen, (and the rest of the house) are your partners domain and theirs to redesign - it will save a lot of grief🙂
Which version of Freecad are you using? I do not have the tool that you used in the SURFACE workbench in mine. I am using 0.20.2
he says 0.21 but on the freecad web site down load is 0.20?
I have raised a query as the tool from the surface workbench has seemed to be removed in the later version. So I am now trying to find out if that's on purpose or a bug
@@MangoJellySolutions I downloaded the appImage yesterday and today did your tutorial so all parts in the Curves workbench are there. FreeCAD_weekly-builds-33110-2023-05-07-conda-Linux-x86_64-py311.AppImage
Watson and Crick are requesting a double helix.
Haha, yes, i tried using the helix function, but the ends don't ease into the straight bits. Then I tried the loft with the many intermediate shape binders, that came close, but not quite the same.
Well a solid left with G1 continuity would create the middle section with one click
This is my biggest issue with FreeCAD
It is incomplete and thus making work often very labor intensive at times.
However very good video !
Its FREE and Open Source, feel free to add to it!
It would be much appreciated
The part isn't quite right because the drawing has the part rotated through the center of the material. So when the extrude operation happens, the "Symmetric" option should be checked when setting the 4mm length. This does NOT distract from the fact that this tutorial shows how to use the Curves workbench to create twisted parts.
And how do you make a Twisted Fire Starter?
Comment for exposure. Keep up the great work.
44=45?
And if you extrude the sketches, the centre lines will not match up, right? You need to correct half the added height.
Personally, I'd have extruded with the symmetric option on in the dialogue box. That should keep the two extrudes aligned.
You need the one infected, twisted animator tool
Lol, 'Charlie Says' you should be able to keep it centered with the symmetrical option on the extrude. Thanks glad you like, sometime doing these types of forms can be a 'Mindfield'. Yes wonder how many people would see the mistake. I nearly reshot the video as I thought it was 'No Good' but decided to keep it..... (off to listen to Prodigy now as haven't for years, tried to dop in the ones I remember lol.. But I am more of a Leftfield guy 😁)
Hey @MangoJelly, can you think of an easy way to model an accordion with a parametrized folding? This is an origami sort of like this i.ytimg.com/vi/yhiLKLpLvlM/hqdefault.jpg (but octagonal)? I think it could be done from a series of master sketches and datum planes, but that sounds veery tedious and each folding level would be a lot of repetitive work!
Huge fan over here! I love your videos, you've made Freecad possible for me!
Now that's an interesting request. With the simpler square according it is a case of using lofts. But if your looking at the octagonal one, that's a bit tricky. Is it this the style your liking for? th-cam.com/video/f6Dw2jPMisc/w-d-xo.html I am temped to follow the video myself so I have something physical to study so I can try to translate it to CAD. Glad your enjoying the videos 😁😁
@@MangoJellySolutions Yes, exactly like that! I am trying to model the many degrees of freedom. I find it fascinating because it is made of rigid planes but it still behaves like a flexible tube as long as the creases are able to flex, but these flexes are also rigid! I promise you it is a fascinating build, if you want to try it :) Thanks again!