FreeCAD Tutorial - Exhaust Manifold, Path Sweep, Make Thickness

[@brothertyler]

Beginner with FreeCAD over here... trying to model a replacement exhaust manifold to cast for a marine->shore diesel generator conversion. LOTS of work, holy cow. They don't even make the FLANGES available for a decent price. OpenSCAD has it's limitations as far as pipework is concerned, so although I'm able to work with that tool... not the right one for the job. Thanks for your comprehensive overview, it's now 1AM.

[@stever3886]

Very nice video. I was in part design and did a couple multi-plane paths. It was mind bending and frustrating. I like your approach. I did find another video that used the DoDo workbench in FreeCAD and it seemed very easy to use . I have not used it since I wanted to make an internal path to a solid block similar to what you are doing but using the subtractive sweep.

[@leonardochiruzzi7642]

Done! It was challenging but I successfully completed the tutorial. Thanks for this video.

[@mathcodeprint]

Well done ! You get the first done bonus badge :)

[@lodhiautos9761]

You are genius,man. Love this video. But the words were bit blurred. Thanks.

[@bikerder]

Excellent, just what I was looking for. Worked on version 0.19

[@jiritichy6855]

Great video....And as for as how tight curve is optimal on exhaust pipe? I am not automotive engineer, but doesn't Free Cad have a CFD?(Computational Fluid Dynamics application/bench). It would bee very interesting to see, if someone with the right experience could do the analysis and show us how to optimize the curvature of this(or any other) manifold in detail.....

[@mathcodeprint]

I agree, I haven't looked into CFD yet.

[@rbp365]

at 3-5 min you mention a method of slicing 2 extrudes and trying to use the intersectional lines for the additive pipe. this method is not working for me. it says that those objects have a null shape. I also tried to use those lines to create various types of objects, shapebinder, line … etc in part, draft workspaces. These have not worked either. Any recommendations? 😮

[@BrainDeadEngineering]

HUGE !

[@vitalijjurt8107]

Try to change transparency next time to show inned hidden part.

[@brucewelty7684]

@18'15" your hollow is bogus. One tube is blocking the other. The exercise this is showing, probably, would get kicked to the curb. Variable radii in tubing sucks. Tube bending dies are a given radius, period. Also, "HOLLOW" although it may be a legitimate FC function probably is not the best option. On the sketch to establish the OD a second circle for the ID probably would be more stable. The teensie bit that I flagellated myself trying to learn FC proved to me that programmers are NOT designers. I am glad you pointed out the floating menu problem, This illustrates that programmers are also not USERS. Any program that has menus changing location and icons is a PITA! I am still looking for a sketch based program so that I can dump SketchUp 2017. Thanks for the effort you put into this video, though.

[@mathcodeprint]

Not seeing the problem at 18:15 , Don't know what to to tell you it is in fact a tube. I have used the ID and OD sketch approach and have no problem with that, it works quite well.. This video was more about getting the Thickness Tool and the Join Tool working. FreeCAD does have a pretty steep up front learning curve. I'm sorry it didn't work out for ya. You might want to check back in a couple of years. The moving menus is really my own own fault. The program stores menu positions for each workbench, this allows you to have a "setup" for each workbench which can be useful. I tend to be lazy with stuff like that. The difficulties of complexity comes from the flexibility and openness of the software, and it is just not for everyone. Let us know if you find something you like and thanks for watching.

[@brucewelty7684]

@@mathcodeprint Thanks. If I knew how to attach a pic (to show what I meant) in a message I would do so.

[@mathcodeprint]

@@brucewelty7684 no need I understand. You can see all the way through the one side, but I didn't show clearly the other. They do in fact both go through. I am bummed a little as I intended to show a cutaway view for this reason. Oh well maybe in another video.

[@lodhiautos9761]

Please upload the correction video and oblige. Thanks.

[@brothertyler]

@@lodhiautos9761 Ungrateful. Quiet, you.

[@peterjansen4894]

Why not a sweep?

[@mathcodeprint]

The "additive pipe" is the sweep. So the first two pipes are the sketch profile swept along the sketch path. These are then joined.

[@xl000]

Notice how he clearly does not want to show the collector side of the exhaust once the model is finished because it doesn't look good, and he doesn't even try to add a fillet to the intersection edges of the 4 parts, because FreeCad would basically explode at that point. You can see at 19:15 that the inside faces of the collector side of the exhaust are doubled, and it will generate a dirty 3d model. This is an exhaust for display only.

[@mathcodeprint]

Lol, most of my models are shit, I am not trying to hide anything. This was VERY hard to get it to work. It is fraught with pitfalls and in-efficiencies. I was only trying to show a way it CAN WORK. You are in-correct about 19:15 , those lines are simply where the surfaces are met, if I "refined" the model those line would dis-appear. You are also CORRECT about it being for display only, I don't think I asserted otherwise. Also, YES, FreeCAD would probably explode if I tired to Fillet this. But now I might try to see if it can handle it as it has been a while since this video. Fillets and Chamfers, are one of the weaker features in FreeCAD. It baffles me why anyone thinks I am trying to hide anything or sneak something by, you clearly haven't watched many of my videos. If in a video I run into a problem or shortcoming of mine or FreeCAD I mention it. That is what I am doing these videos to help with, the problem areas. Maybe next time you could simply ask me, instead of addressing the audience like I am not really even a person. If there is any other problems feel free to point them out. I will let you know if it is my shortcoming or FreeCAD

[@notaste6002]

well in 99% hollowing object in Freecad just doesnt work, every damn video is just showing how to hollow fuc*ing cube or just tutorial based on someone elses video. No way to simply hollow complex object

[@hw5533]

Hi, I was struggling with this too recently. I managed to work my way around it by creating the solid pipe using sweep then adjusting in 'Part Mode' using the 'thickness' tool. Good luck.