Nature For Moderator Internals

[lbc_PSI]

Was thumbing through a NatGeo magazine and saw the origami picture and immediately thought of 3D-printed cone baffles.

Then read the article about otters and maybe a 3D-printed version of otter hair instead of felt.

Last but not least, honeycomb hex shapes to trap air.

Too much time on my hands, I guess.

 

[lbc_PSI]

Using the hex design as column insert into a moderator baffle segment..

The circular drawing would be sized to the ID of the baffle segment and as tall as required.

 

[bigHUN]

Not sure how printing a honeycomb thin walls can be feasable with FDM. Resin printing maybe I have done it with 0.2 mm walls, but the biggest issue I am seeing is the material erosion from a lead dust.
Without a test run we just speculate.

 

[lbc_PSI]

IDK how 3D printed material would hold up. That said, the hex shape is one of, if not, the strongest structure in nature.

I wish I had the 3DCAD software design background to generate and print a test.

 

[subscriber]

How about a snail shell for inspiration? This is a section view of a Huben pistol muffler that is about to be tested for function and robustness that I designed:

There is also a double spiral version. The odd looking structures inside are permanent supports to enable FDM 3D printing:

 

[subscriber]

Your venturi wall idea has merit, in principle. Anything to create a differential in flow resistance: Easier for air to flow into that annular space, and more resistant, out. I do that by rounding over vent hole edges on the inlet, and keeping them sharp on return flow.

 

[subscriber]

One has to start by capturing an idea so you can contemplate it, and analyze it. Then, that will inspire improved ideas. Even if you have to cut off half and turn it upside down Throwing out an idea too soon because of a perceived shortcoming, is to throw away the seeds of a great idea.

Hexagons are material efficient, and stiff in compression, straight into the "page", as drawn above. From the side, triangles are much stiffer and stronger, but have less usable space inside, if you want to grow a bee larva, for example.

Hexagons are strong when bonded to a stiff front and rear metal or carbon fiber sheet. Then, all the little walls in the hex adds multidirectional shear strength; and by spacing the cover sheets apart, adds huge bend stiffness and strength to the composite structure. This, while adding little weight. That is why such hex stiffening materials are popular in aerospace structures:

Honeycomb | Hexcel

HexWeb® is a lightweight core material that is available with regular hexagonal cells or in over-expanded (OX) form.

www.hexcel.com

A bunch of triangles can be arranged to form hexagons; then you have both shapes. Here is the outside of a muffler I designed for someone:

 

[subscriber]

Taking a quick look at how 3 dimensional hexagonal structures stack around the perimeter of a circle, there may be a problem: The side walls have to be radial to fit in parallel with each other, but if you do not also taper the other four sides, the shape is no longer hexagonal.

Making a 3D hex and stacking them in a circle, so that the hexes meet at the circle OD, creates a gap at between hexes at the circle ID.

So, some form of distorted hex will be required to stack properly with shared walls between hex cells it seems.

 

[BlackICE]

How about a Nautilus shell

 

[subscriber]

 

[lbc_PSI]

Taking a quick look at how 3 dimensional hexagonal structures stack around the perimeter of a circle, there may be a problem: The side walls have to be radial to fit in parallel with each other, but if you do not also taper the other four sides, the shape is no longer hexagonal.

Making a 3D hex and stacking them in a circle, so that the hexes meet at the circle OD, creates a gap at between hexes at the circle ID.

So, some form of distorted hex will be required to stack properly with shared walls between hex cells it seems.





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Yes. A "Distorted Hex" shape woud be required. More of a Funnel or Trapezoidal Hex shape. The "pots" would trap the air and the "venturi" would accelerate the air into the "escape channels"..but the opposing shapes would nest within each other. Great CAD drawing BTW..What program?

 

[subscriber]

Solidworks

 

[Weihrauch]

I have FWB 603 and I’m looking for the perfect size hair curlers to fit shroud.
I’m curious if you ,that have silenced yours this way could tell me where you found them and/or size. Thanks

 

[subscriber]

I presume the FWB603 has a short barrel and a "bloop tube" to increase the sight radius? The best bet is to remove the front sight holder and measure the ID of the tube.

Manual with sectioned image, here: https://forum.vintageairgunsgallery.com/postid/5016/

That said, perhaps the FWB question belongs in its own thread. Not that it bothers me.

 

[woogie_man]

I have FWB 603 and I’m looking for the perfect size hair curlers to fit shroud.
I’m curious if you ,that have silenced yours this way could tell me where you found them and/or size. Thanks

Just put an end cap on it and be done. They shoot so gently that you don't need a full baffle stack.

 

[Weihrauch]

Ok thank you