FreeCAD: Quick and Easy Parametric Section / Ribs / Bulkheads / Cross Sections with Curves Workbench
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- เผยแพร่เมื่อ 13 มิ.ย. 2024
- If you are familiar with building boat hulls or a air plane fuselage then at some point you will need to create the bulkheads or ribs. There are tools in FreeCAD part workbench that allow for cross sections but they are not parametric. We will explore a method of using the Curves WB to create a cutting tool that we can use both as a sectioning tool to split the body into sections and use as a sketching surface.
In this tutorial we will take a boat hull and create it from just three of profiles, two of which are the same. We will loft through these profiles to make our hull of the ship / boat. Using tools in the curves workbench in seconds we will create 8 ribs or bulkheads to cover the length of the boat. The shape of which can be modified from the original three sketches.
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Wow, this opens up a lot of options for me, Thanks
It was really enjoyable video to work on. Glad you enjoyed.
Nice example. Thanks for sharing. You do a great job explaining your workflow.
Thanks for the comments great to hear. Really appreciated.
Nice technique. Well presented.
Thank you for the feedback, glad you like 😊
Great Video,s....... Thanks for you tutorials
Well done. Very efficient.
This is massive for me. I want to build a rc plane and the slicing part is huge to me, to gather the bulk head dimension as they flow down the loft from A to X. Efficient way ! Surfaces and lofting is my weaker point so this is cherry jello to me ! Thank you !
This is great that you have found the video useful, thanks for the kind comments and sharing. There are going to be a number of follow up videos answering a number of question which go into this subject even further. Also there are some questions I want to answer regarding waffle architecture structures that use the same cross sectioning method so there is a lot of overlap and I have a number of ideas for future videos. Remember you can go the other way as well so you can make cross sections running vertically through the leading edge to the tail edge of the wing for support. I spent some time as a team rider during the traction kite craze (basically paragliders on 4 lines) and did a bit of kite building and repair both open and closed cell using CAD so watch this space as I have some ideas around that area and there is bound to be some overlap as the wing has similar build features but in flexible ripstop form
Same here Brain Dead I fly RC in QLD Australia. I can see all sorts of design possibilities here. For Darren, Ribs are Wing Sections. Generally Fuselage/ Hull Sections are known as Frames.
You got me ! they are called frames, but I looked it up again, wing bulk heads are still call ribs ! sorry its not easy being brain dead ! lol
@@russellw5447
Great job
So awesome thanks for the video!!!
I am going to try and use this method to make parametric art. So kinda backwards lol cheers
Good luck!, sounds a cool little project. Glad you enjoyed
This is a great tutorial, thanks!
Thanks!
Another great video. Awesome Technik. I still keep giving thumbs up and following your videos. Do not give up you will hit a big video. You7 have excellent content and you are informative. I will push your videos on my end because I be leave you truly bereave in what you are doing. Thanks you so much. I was wondering can you bring stuff into FreeCAD like you do in Fusion like McMaster-Carr drawings to help your projects.
Thank you so much, it blows me away how kind people have been like yourself, its great feedback and real boost of confidence for myself. Thank you for the continued support, it really means a lot. In regards to your question I have had a lokk at the site you said about and. I believe you want to import the image into freecad and use it as a sketching reference, so to sketch / trace over it? If so then yes you can use the image workbench and the scale tool. There are a videos on my channel th-cam.com/video/xQcDoAhmoa8/w-d-xo.html that shows how to do this if this is what you are looking for.
Amazing tutorial as always! I have a question, instead of using the curves workbench to make the rib slices, is it possible to make 1 rectangular slice and make a linear array using the draft workbench and then do an intersection boolean operation with the loft and this array to get the ribs? Thanks!
Edit: It seems to work and it also is parametric as we can change the slice spacing and slice thickness from the array settings. What are your thoughts? Thanks as always!
Thanks for that glad you enjoyed. Yes you could use the linear array tool in draft. But be careful if you decide to use the path array, that one is pretty twitchy if you start altering the path. I was trying to do this for a project which involves a waffle structures and each time I tweaked the path to follow the structure I wanted to cut up into sections it would go into error. Thanks for sharing, great to get alternative ways to get to the end goal.
Very useful, thanks. Couple of questions - how would you introduce a curved sheer line and would it be simple enough to draw the bulkhead shapes on to an inserted canvas/image?
Thanks for the comment. You would basically need more profiles to follow the correct curvature or in another one of my videos I use a skeleton and create lofts rather than from front to back but from the side from the rocker upwards (or the other way) with Interpolate Curves connected to the skeleton. Then I loft through each of these. Once you have the loft then you can place the cutting planes through it and cut using the same process. I am tempted to create a video with the workflow from beginning to end.
Thank you. I've been working my way through your videos and have found them very helpful.@@MangoJellySolutions
@@MangoJellySolutions Yes, please follow your temptation and do that video !. It would be very useful for many followers. Thanks in advance.
Greetings from Santiago de Chile, South America. John.
When lofting your boat, the stations are based on Extrudes and the result is a square edge. After the slices are made, can the square edges get a chamfer that matches the fair edge? or is that too difficult and best left to the preparation of the stations after they are cut into real parts?
Wonderful video. Thank you.
You can chamfer the loft before the cut which will then pass the chamfer along to the stations or you could chamfer the individual stations. I am putting together a second video which I hope will answer the questions asked by a number of viewers so I will include. Glad you liked the video.
@@MangoJellySolutions Thank you for the reply. I will finish the exercise so I am ready for part 2.
Hi, many thanks. I'm having problems adding fillets on things like casting patterns where multiple fillets join or split, or fillets run out to a tangential join. Sometimes adding a few microns can make all the difference. Would like some more exact knowledge to get best from FreeCAD.
I am in process of putting a video together of common filleting problems and how to get round them. I see if I can get this out soon.
@@MangoJellySolutions 😁
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Very useful , I was wondering if you could use that first sketch which is parametric , and scale them up or down on each station ?? could each station be shifted either up , down left or right along centerline ?? Thank you , Terry
Yes you can. If you use the draft workbench you could clone the sketch and then attach it to the stations in the same way. The clone has a scale option which you can be adjust. The individual stations can't be shifted as they are but the iso lines can be exploded into individual lines via part wb, compound, explode and then those extruded. You will then be able to move them.
@@MangoJellySolutions Link has scale option as well.... so you could cut out the sketch and have directly linked/scaled bodies
Super technique. How do you figure out these things? ;) One important question, is there a way to make a PREDEFINED GAP between the ribs and outer skin? 3d printing slicers need to get fooled so that the ribs don’t show up on the outer skin(hull) wall during printing. For example, the hull is 0.4mm and the gap between hull should also be a constant 0.4mm. Thanks for your awesome tutorials.
Thanks for the comments. I have a book full of ideas and sometimes I wake up and have to jot something down so always thinking lol. In regards to the gap I am thinking to go with a clone of the original loft and and shrink down the clone first and slice through the clone. This comment with some before I can see a follow up video coming 😁
@@MangoJellySolutions That method to shrink would work. However, if one uses this technique with airfoil shapes, then an offset type technique (rather than shrink) would better preserve the gap in the trailing edge of the airfoil shape. Is there an offset command that would work with your work flow?
Sorry for the confusion if you get a message from a different account, replied from a different computer from my personal account. That is true when your loooking for that level of accuracy. Wondering about 2D offset on the split profile before extruding into the finished profile . Or offset the profile first so you creat two lofts? Let me think about it and get back to you..
I saw some practice of wooden hull craftsmanship,workers have to grind the ribs with a long flexible grinding bar so that the planks & ribs will be good fitted in later construction.Therefore,is there any drawing techniques of free cad which can express the variable curvatures on the brim of each rib?Thank you Mr. Free cad M.J.
I will have a look into the techniques you have described and have a look.
How can i install curve workbench if is no available at add list?
Hi,
Merci !
Avec plaisir