topic Re: Modelling a Rifled Barrel in Fusion 360 in Fusion Design, Validate & Document Forum

Modelling a Rifled Barrel in Fusion 360

Anonymous — Fri, 26 May 2017 06:04:29 GMT

Hi, does anyone know how to model a Rifling in a barrel in Fusion 360? is it even possible?

Re: Modelling a Rifled Barrel in Fusion 360

Anonymous — Fri, 26 May 2017 08:14:19 GMT

Everything is possible with Fusion 😉

Do you have any reference image to help you?

If it was useful please give me kudos

Re: Modelling a Rifled Barrel in Fusion 360

etfrench — Fri, 26 May 2017 08:23:55 GMT

The Coil operation will work for this.

Re: Modelling a Rifled Barrel in Fusion 360

Anonymous — Mon, 29 May 2017 02:36:59 GMT

I don't think "everything" is possible.

Its the Twisting of the barreling to get the consistent curve of the rifling. You know what Rifling is right?

Re: Modelling a Rifled Barrel in Fusion 360

Anonymous — Mon, 29 May 2017 02:45:42 GMT

Thanks,

But I am having difficulties trying to model this:

That is the rifling that has me up all night trying to figure out how to model.

Re: Modelling a Rifled Barrel in Fusion 360

davebYYPCU — Mon, 29 May 2017 04:00:18 GMT

I answered in the other thread, but Ed is totally correct,

You don't tell us what you have tried or not attached the file, so help is general,

Re: Modelling a Rifled Barrel in Fusion 360

cekuhnen — Mon, 29 May 2017 13:44:00 GMT

@Anonymous

Of course is it possible

Make a hollow tube

add a coil

set the values

use a square profile

use solid combine cut to remove the coil shape from the inside of the hollow tube

use circular pattern to add more cuts

Rifling done.

Re: Modelling a Rifled Barrel in Fusion 360

HughesTooling — Mon, 29 May 2017 14:28:48 GMT

One problem with coil is it deforms quite badly with coarse pitches and the twist rate for riling is something like one turn in 200mm according to google.

So a 2.5mm square section ends up like this. We really need the form perpendicular to the helix!

Re: Modelling a Rifled Barrel in Fusion 360

cekuhnen — Mon, 29 May 2017 17:49:35 GMT

You could use the helix as a base
Put a sketch onto an end
Use the sweep command by using coil edges as tails

But agree in this area coil and sweep lacks surfacing depth and quality

Re: Modelling a Rifled Barrel in Fusion 360

DJC3103 — Fri, 01 Sep 2017 10:40:54 GMT

Ideal Solution...

Looking to make an automated bore measurement, and need to model the rifling to prove the movement of the mechanism when travelling down the bore.

Re: Modelling a Rifled Barrel in Fusion 360

etfrench — Sat, 02 Sep 2017 07:57:42 GMT

Which type of rifling do you want to measure, cut, broached, hammered, etc? The shape of the rifling may also make a difference in the solution.

Re: Modelling a Rifled Barrel in Fusion 360

SaeedHamza — Sat, 02 Sep 2017 12:00:53 GMT

@cekuhnen @HughesTooling

Isn't there a way to fix this accuracy issue regarding the coil and sweep??!

It's such a pain and a silly limitation for Fusion to have

But I guess it's just as Mark said, it's about the perpendicular helix after all

Regards

Re: Modelling a Rifled Barrel in Fusion 360

TrippyLighting — Sat, 02 Sep 2017 14:34:44 GMT

@SaeedHamza there are no ways to fix this that are in our control as users. The coil tool is listed under the primitives in Fusion 360. These could be tremendously useful but all of them suffer from implementation shortcomings. We've complained for 2 years about the coil tool and these issues come up with regularity.

There are the usual workarounds that also have they limits and pollute the timeline with "stuff:that should actually be necessary.

You basically use the coil tool to create a coil and I mostly use the triangular profile. Then you can throw most of the geometry away and use an edge of the helical profile to create a plane on path. On that you sketch your profile. You'll likely need a second coil or in some instances can use the vertical axis as a rial to control the twist of the sweep. I've not tried this with the newest incarnation of the sweep tool.

In other CAD application you simply can create a helix as a sketch and fine your own profile without having any twist problems. This was easier with Solid Works 10 years ago!

Re: Modelling a Rifled Barrel in Fusion 360

cekuhnen — Sat, 02 Sep 2017 16:35:47 GMT

@SaeedHamza

This is something we also as EEs suggestion to the development team to fix.

I have one test suit that shows every approach I use with the coil tool simply will sooner or later break.

Till that is not fixed these simple geometries will be problematic in Fusion.

And as Peter mentioned also workarounds will be not a good option because of other problems you will find.

The solution is to fix the real problems in Fusion.

Re: Modelling a Rifled Barrel in Fusion 360

SaeedHamza — Sat, 02 Sep 2017 22:28:18 GMT

I hope that Fusion team consider this soon

Thanks for the replies everyone

Re: Modelling a Rifled Barrel in Fusion 360

cekuhnen — Sat, 02 Sep 2017 22:46:07 GMT

@SaeedHamza

the more users report / request mugh needed improvements to modeling tools and general modeling abilities the higher the chance the development team will put more focus on core tools than modules that build upon what sketch and model/patch creates.

Re: Modelling a Rifled Barrel in Fusion 360

SaeedHamza — Sat, 02 Sep 2017 23:43:37 GMT

Yes, I totally agree

Re: Modelling a Rifled Barrel in Fusion 360

Anonymous — Mon, 02 Oct 2017 04:17:23 GMT

Hey @cekuhnen

Thanks for that solution it helped me alot, cheers!

Gave you a Kudos bro!

Re: Modelling a Rifled Barrel in Fusion 360

micmac253 — Sat, 21 Jul 2018 23:16:12 GMT

Ok so, after messing around for quite awhile I have found a super easy and quick way of making rifling of any type and any size. so the first thing you will want to do is create a new sketch and make two circles and a rectangle like this:

After you have done this go ahead and open up a circular sketch pattern and select the whole rectangle you made and then the centerpoint of the circle. after that go ahead and choose how many cuts you want to make, I chose 8 as you can see.Once you've done that then make a line going from the middle straight up to whatever length you want the barrel to be.After that the create a coil from the center to the outside edge. It will look something like this.

Now edit the coil so its as long as the guiding line you made. and also change the revolutions to a small value like 0.5 or 0.7 depending on how long your barrel is. make sure the coil is on new body and then click ok and it should look like this:

Now create a sweep command and for the profile select path + guide rail, for the profile select the outline of the barrel, for the path select the guide line, and for the guide rail select the outside of the coil. Make sure the operation is set to new body not cut, once that's done hit ok and bam! There's your rifled barrel. now just select that coil and delete it and there you go!dont forget to delete the coil!

Hope this is useful to everybody searching of a solution like I was.

Re: Modelling a Rifled Barrel in Fusion 360

chrisplyler — Sun, 22 Jul 2018 18:37:30 GMT

Meh. The Coil tool blows chunks. I find most challenges better solved by just sweeping with a twist angle input.