I would like to recreate this valve disc as an exercise in #freecad and fail because of the angled holes in the cone. in addition, the holes consist of threads, a cone and another stepped hole. Can anyone help here?
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@wrdlbrmpft Do you need to have the actual threads in the holes, or would a schematic representation work?
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@chrishuck there i no need for now. Maybe for my next exercice.
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@wrdlbrmpft@tchncs.de What did you try? Can you share your FCStd file so far? Can you sketch the profile of the holes?
I can think of a few ways to model the holes but a sketch of a profile of one hole (pictures of paper sketch would be fine) with dimensions would clarify.
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@mcdanlj It's a (first) exercise to learn freecad.
What I have so far on my private nextcloud:
ventil plate:
https://cloud.tay-tec.de/index.php/s/q3aKKFo2EQGQbxn
one hole looks like:
https://cloud.tay-tec.de/index.php/s/dZdzDM9DDTYExZx
thank you very much
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@wrdlbrmpft @mcdanlj Here’s what I was able to model quickly not knowing any dimensions.
You can use Polar Patterns of the hole features to get the multiples. As previously mentioned, you will have to create an angled plane for the angled hole sketch. I recommend using the cross-section sketch to locate the plane.
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@chrishuck @mcdanlj Great work, looks beautiful. I will try the new key words.
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@wrdlbrmpft @mcdanlj If you’d like to download my model and see how I did it, I put it up on GitHub. Always glad to help people with FreeCAD! This is only one way to do it. There are multiple solutions.
https://github.com/chrishuck/FreeCAD-Testing
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@chrishuck @mcdanlj ok, I need some time to get all your ideas.
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@wrdlbrmpft You can compare to how I did it if you like. Chris is faster than I am.
I changed the pockets to holes and guessed at design clearance type. It's possible to enter arbitrary clearance if your measurements were precise (for example, made with gauge pins). But normally I just use the hole parameters to express design intent, and you can look at how I did that.
You can also look at how I made the screw holes to get that 30° taper to a 1mm diameter hole you showed in the hole profile. I made a 1mm hole through, which I think was your intent, but you could instead change the depth to something specific. Then I used the same sketch to make an M4 hole, 6mm deep threaded, with a 60° included angle drill bit tip modeled, which gives you the cone down to the hole at the bottom. Then I used a polar pattern around the correct axis to repeat the threaded hole.
https://drive.google.com/file/d/1o2Y_520XQCozIzSHkspFr7tmj-jndZVn/view?usp=sharing
Whenever you can use polar, mirror, or linear patterns, it will be faster because the base feature doesn't need to be recomputed each time and internally the others are just references.
@chrishuck feel free to download and critique my approach.
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@mcdanlj @chrishuck
Many many thanks to you. You are to fast for me. 😍 I'm totally overwhelmed.
I need some time to analyse your solutions.
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@wrdlbrmpft @chrishuck Oh, a few other things I did:
Enjoy comparing Chris's solution and my solution! There's generally several ways to go about it.
While FreeCAD does now in 1.0 allow you to select only certain elements of a sketch to apply different operations to, that ends up being tricky to modify. It's generally easier to modify your parts later if you use that only for a master sketch with major features, and use external references (G X hotkey sequence in sketcher) to build out all the features you want in a complete sketch for an operation. In the end, it's very often quicker just to use separate sketches for different operations.
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@mcdanlj @chrishuck You may be wondering what this part is. It is a part of the switching valve from 1990 for High-performance liquid chromatography #hplc produced by me in the former GDR.
Position (6) in the schematic representation: https://en.wikipedia.org/wiki/High-performance_liquid_chromatography
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@mcdanlj @chrishuck … and a real world image with a similar valve in the lower right corner:
https://media.laboratoryequipment.com/m/52/article/587051.jpg
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@wrdlbrmpft @mcdanlj top@chrishuck@fosstodon.org Wow, you guys're fast!
Here're some screenshots of my model. If you'd like to get the #FreeCAD file, please let me know.
The dimensions are made up by me and if it would be a "real" part / model, I'd recommend to make several dimensions depend on each other to make it more stable and easier to change.
Edit: I forgot #freecadfriday
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@wrdlbrmpft OK, some general feedback.
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