Midget in progress

[freakshow10mm]

First look at the Freakshow Mfg Midget .22LR suppressor prototype.
It's 6061-T6 aluminum, 1 inch OD, 5.25 inches long, 4.7 oz as it sits (final weight 3.5 or so I hope). We are going to finish it up tomorrow, file the Form 2, and test fire. We have to groove it for the o-rings, D&T the set screw (as a backup), part it off at 5.25 inches and then finish it with emery cloth to make her shine like new money.

Yes I will have video for this one.

Wish me luck guys.

http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3230358.jpg
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3230355.jpg
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3230356.jpg

[creophus]

Good luck Freak! Man I'll bet ISUSteve is gonna get excited when he sees the title of this thread.

Will you need a nielson(sp?) device for this?

[freakshow10mm]

Not needed. It's for a fixed barrel weapon so no booster is needed or desired. Boosters are required for barrels that drop under recoil like 1911s, Glocks, HKs, etc. You can make the suppressor light enough to not throw off the cycling but that means exotic alloys for centerfire pistols. My R&D machinist is running numbers on a short, fat suppressor for the Glock 26 that won't require a booster.

[freakshow10mm]

Here's me shooting it. Pretty cold out. 28 degrees, 20 mph wind open field on the farm. Ammo used is Remington 36gr gold plated HP @ advertised 1280fps (rifle).

I'm somewhat satisfied but the design needs work. I think a lot of the noise is the gas coming out of the breach. We held the action shut and fired it with a fixed slide and it was much quieter. My machinist estimated 5-6 dB quieter (we didn't have a meter on us).

http://smg.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/?action=view&current=P3230008.flv

[creophus]

I couldn't tell from the video if you had ears on or not. Is it hearing safe? It would also help to hear it with the suppressor and without the suppressor to get a better feel for it.

Either way its a good video. Thanks for posting.

[freakshow10mm]

No hearing protection was worn. It's hearing safe. We didn't experience any ringing of the ears or any pain. We shot perhaps 70-80 rounds in quick fashion and snapped two video clips. It was cold out there.

I forgot to take a clip of unsuppressed for a baseline. I'm heading out again tomorrow and should be able to get some more video.

Here's my R&D machinist shooting it. I think it sounds quieter when he's shooting it than when I did.

[/URL][url]http://smg.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/?action=view&current=P3230007.flv (http://smg.photobucket.com/albums/v239/freakshow10mm/Freakshow)

[freakshow10mm]

Results after 200 rounds.

First baffle
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3260039.jpg

Last baffle
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3260040.jpg

Gun side leakage around the stack
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3260041.jpg

Faint circle print on slide from gas jet coming back
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3260042.jpg

Found the culprit of the loudness. The can isn't fully sealed in the rear. There is gas escaping. The press fit of this tube is tighter than the first one. You have to hammer it out with a wooden dowel and hammer. Just to get it sealed, we are just going to locktite a washer on the rear of the can and drill the hole to half inch. Should give us a better indication of performance at that time.

I have also found a fluids engineer that I have working on my team for free. His dad is the designer for the electronic ear muffs made by several different companies. He developed the concept from the ground up. He is also working with my company on the sound testing. He is a rep for Texas Instruments and is designing a sound meter specifically for suppressor testing for my company. Networking in this business is everything.

[creekwalker]

Adam,

Wouldn't this device fall under the muzzle brake catagory more so than as a suppressor? I'm puzzled by the lack of any type of wipe or exterior cover, which of course may already be planned for it.

[MONTEGOD7SS]

I am pretty sure this is the disassembled view to show the powder patterns on the baffles after the cover is removed.

[creophus]

Yeah that's my understanding as well. If you check out Adam's video you'll see it in action with the cover on it.

CW, newer suppressors never use wipes.

[freakshow10mm]

Some of the pics are with the tube off of the baffle stack to show the design of the baffle stack. A suppressor is just a muzzle brake housed in a tube.

I got some industrial strength locking compound on a flat washer installed on the back of the suppressor to seal it up. The larger shoulder on the barrel adapter seals up the central hole very well. Should be quite a bit quieter. I'll test fire tomorrow afternoon when I drop my son off. I won't be able to get video.

[freakshow10mm]

http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3270044.jpg
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3270045.jpg
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3270047.jpg
http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P3270046.jpg

[Brass Nazi]

Ah,

Nothing hit's the spot like Midget porn!

Keep the pics coming.

[freakshow10mm]

I'm going to try making some M baffles and see how that works. I have to order a countersink to cut the cone. The rest can be cut with a tool. I have to buy some blanks and grind away.

I sealed up the rear of the tube, but it's still loud. My buddy has some standard velocity ammo we are going to try. Should be subsonic in the pistol and be quieter.

[ISUSteve]

Good luck Freak! Man I'll bet ISUSteve is gonna get excited when he sees the title of this thread.



And you were correct!

And to keep things on topic, nice cans man!

[Brass Nazi]

Adam,

Can we see a picture of the sight picture with the can installed?

Also, What would be involved to install something like that on a Buckmark?

[freakshow10mm]

That's about the best I can do. The top of the can comes to the bottom of the front sight dot. The P22 comes with 3 front sights so this is the one that came installed when I bought it. .1845" high from the slide. Any .22 with a 1/2"-28tpi thread will accept this suppressor. Thread length is .397 inches.

http://img.photobucket.com/albums/v239/freakshow10mm/Freakshow%20Mfg/P4010066.jpg

[creophus]

That's a good sight picture. You gonna keep it that color or give it a different finish?

[MONTEGOD7SS]

Are you going to make one that can be ran wet and be disassembled? Also, do you think the bore is slightly too large causing it to be louder than expected?

[freakshow10mm]

All my cans are dry. All will be designed to disassemble for user maintenance.

I think we can run a tighter bore. This is .285 IIRC. I want to drop it to .260-.265. With being able to be cleaned I can run a tighter bore than a sealed design.

I am also going to mill out the area between the baffle chambers on the outside to create recesses nearest the tube wall. Mouse holes will be drilled and this will bleed additional gases as far away from the bore as possible. I am also going to stagger the baffle chambers for another design. The blast chamber will be straight but the rest offset .15" from center.

Similar to this one except sized to 1x6"
http://www.5bears.com/nc/nc20.jpg

[creophus]

I imagine that would also make it lighter right?

[MakeMineaP99]

My concern with that route is creating a stress concentration.

[ISUSteve]

My concern with that route is creating a stress concentration.

Nothing really wrong with stress concentrations. If they are a point of failure, then you need to do something about them. If they aren't, then the stress is just higher there, that's it.

[MakeMineaP99]

If you remember from machine design however, stress concentrations affect fatigue life and safety factor in fatigue, and need to be accounted for in the design. If you run the numbers and everything looks good, great, however, you can't modify an existing design and expect the K sub t to remain the same, which in turn affects everything else. Something to consider. Square corners, sharp edges, welds and other notches have proven cause havoc in designs, remember the Liberty Ships.

It's a failure consideration in design, that's all.

[ISUSteve]

All true. I'm just saying, it may work for him. Just cause there's a sharp edge there, doesn't mean the design won't work.

How many psi does a 22 suppressor see?

[MakeMineaP99]

Couldn't tell you, I would estimate under peak pressure in the chamber though. You could just design "worst case" and use chamber pressure if nothing else.

[ISUSteve]

I'm betting it would be way under chamber pressure. I'd guess less than half, but I don't have anything to back that up.

[MONTEGOD7SS]

Oh how I miss you two blathering on with formulas and what not. Glad to have you back around Steve.

[freakshow10mm]

All true. I'm just saying, it may work for him. Just cause there's a sharp edge there, doesn't mean the design won't work.

How many psi does a 22 suppressor see?
Peak chamber is around a .45 Auto, 15-17K psi. The original design is a safety factor of 22 with 6061 and 52 using 7075 or 303SS.

If you remember from machine design however, stress concentrations affect fatigue life and safety factor in fatigue, and need to be accounted for in the design. If you run the numbers and everything looks good, great, however, you can't modify an existing design and expect the K sub t to remain the same, which in turn affects everything else. Something to consider. Square corners, sharp edges, welds and other notches have proven cause havoc in designs, remember the Liberty Ships.

It's a failure consideration in design, that's all.
I have a fluids engineer on staff that works on that stuff. He is calculating the numbers for this and another design we are working on.