[Solved] Need help modelling a rifled barrel
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[Solved] Need help modelling a rifled barrel
I found similar thread on our forum but it was from over 10 years ago: viewtopic.php?t=3252&sid=4df0a4af1433a9 ... 7e4c53f2f8
I think it's appropriate to make a new one
FYI: I'm using FreeCAD 0.20.1
I want to model a rifled barrel. With 4 land and 4 grooves. It should looks something like this from the front
This picture below just to show how it would look in real life. Don't mind the number of land and groove on this one. I only need 4
I'm thinking of create a pad from sketch. Then somehow induce twist to the whole thing. But i don't know how. This is as far as i can get
UPDATE:
For any user trying to find a way to model rifled barrel like me. I suggest to go with the Subtractive Helix method.
The example file below model a 45 ACP barrel section. Groves were made using SubtractiveHelix and PolarPattern
I think it's appropriate to make a new one
FYI: I'm using FreeCAD 0.20.1
I want to model a rifled barrel. With 4 land and 4 grooves. It should looks something like this from the front
This picture below just to show how it would look in real life. Don't mind the number of land and groove on this one. I only need 4
I'm thinking of create a pad from sketch. Then somehow induce twist to the whole thing. But i don't know how. This is as far as i can get
UPDATE:
For any user trying to find a way to model rifled barrel like me. I suggest to go with the Subtractive Helix method.
The example file below model a 45 ACP barrel section. Groves were made using SubtractiveHelix and PolarPattern
Last edited by nobeltnium on Wed May 31, 2023 6:35 pm, edited 2 times in total.
Nobeltnium
Re: Need help modelling a rifled barrel
PartDesign SubtractiveHelix or PartDesign SubtractivePipe should handle this.
- Shalmeneser
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Re: Need help modelling a rifled barrel
(problem when different sketches are on the same plane : PartDesign_AdditiveHelix is not always a friend)
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- Annotation 2023-05-30 113047.jpg (22.45 KiB) Viewed 845 times
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Re: Need help modelling a rifled barrel
May i ask why? What happen if multiple sketches are on the same plane?: PartDesign_AdditiveHelix is not always a friend
Nobeltnium
Re: Need help modelling a rifled barrel
It can cause what's referred to a coplaner failures. It is hard to describe, but when you see missing faces or faces that seem to poke out in odd directions from expected model shapes. Once you've seen it happen, it's easy to recognize.nobeltnium wrote: ↑Tue May 30, 2023 10:03 amMay i ask why? What happen if multiple sketches are on the same plane?: PartDesign_AdditiveHelix is not always a friend
Star Trek II: The Wrath of Khan: Spock: "...His pattern indicates two-dimensional thinking."
Re: Need help modelling a rifled barrel
Hello,
reference the attached sketch ... adjust to your dimensions.
frcaduser
reference the attached sketch ... adjust to your dimensions.
frcaduser
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Re: Need help modelling a rifled barrel
Hi frcaduser
Not sure if i'm missing something here. I opened your file and don't see any twist rating on you rifling (it need to be twisted, that's why i asked)
Regards.
Not sure if i'm missing something here. I opened your file and don't see any twist rating on you rifling (it need to be twisted, that's why i asked)
Regards.
Nobeltnium
Re: Need help modelling a rifled barrel
I corrected the cross-sectional design. You can follow Shalmeneser's post/project for adding the internal helix at your end.nobeltnium wrote: ↑Tue May 30, 2023 12:36 pm Hi frcaduser
Not sure if i'm missing something here. I opened your file and don't see any twist rating on you rifling (it need to be twisted, that's why i asked)
Regards.
frcaduser
Last edited by frcaduser on Tue May 30, 2023 5:48 pm, edited 3 times in total.
- papyblaise
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Re: Need help modelling a rifled barrel
I took several minutes to understand that he persists in helixing in Y, you have to force him in Z
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Re: Need help modelling a rifled barrel
Wow that's super papyblaise! I really haven't think of that
I was able to reproduce drmarcro method on my model and it works great. But helixing the sketch made things super simple and less work
I also notice that with drmacro method, once i introduce the Polar Pattern fundtion it takes a big toll on my machine. Everytime i open/close a sketch or changing the twist rate, FreeCAD will hang for 30-40 seconds even though htop and task manager show little CPU and HDD usage. My rig isn't wimpy either, she has a i5-9400 with 64GB of RAM with FreeCAD using only 2GB. Not sure if this is something every one encounter or there's something wrong on my end.
Nobeltnium.
I was able to reproduce drmarcro method on my model and it works great. But helixing the sketch made things super simple and less work
I also notice that with drmacro method, once i introduce the Polar Pattern fundtion it takes a big toll on my machine. Everytime i open/close a sketch or changing the twist rate, FreeCAD will hang for 30-40 seconds even though htop and task manager show little CPU and HDD usage. My rig isn't wimpy either, she has a i5-9400 with 64GB of RAM with FreeCAD using only 2GB. Not sure if this is something every one encounter or there's something wrong on my end.
Nobeltnium.
Nobeltnium