30 cal 1.625" Titanium w/MAAD 51T

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1rflman
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30 cal 1.625" Titanium w/MAAD 51T

Post by 1rflman » Mon Aug 22, 2016 6:03 pm

Components:
Titanium Joe's tubing @ 8.350"
ZMachineworX 1.482 x .500 Ti cones - (8)
Texas Arms 1.482 x .125 17-4 cones - (2)
Custom 1.482 x .750 17-4 blast baffle
Custom Ti 1.0 & .375 spacers
Custom 17-4 MAAD adapter with 1.25 blast chamber
Custom 17-4 end cap - internal cone
SiCo 51T QD mount (to AAC 51T Brakeout muzzle device)

Finished in KG Gun-Kote flat gray heat-cure coating
Image
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Shown here mounted on my 9.625" barrel 300BO pistol...
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iron.maiden
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by iron.maiden » Tue Aug 23, 2016 4:45 pm

nice work sir , very well made , how does it sound ?

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whiterussian1974
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by whiterussian1974 » Tue Aug 23, 2016 4:54 pm

YOU SIR, are an Artist. :mrgreen:

Beautiful work.

Why didn't you flute the tube further toward the far end threads? Did you feel that there would be little gain?

Nevermind, I see the step-down in OD for the last couple inches. :wink:
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The Death of One is a Tragedy, a million only a statistic.-Stalin
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by sickasssig » Wed Aug 24, 2016 8:00 am

Very nice lookin cansmithing sir like the other guy said u sir are an artist
:evil: hey watch this

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by nbw123 » Wed Aug 24, 2016 4:57 pm

Nicely done. I went the MAAD route as well.

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1rflman
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by 1rflman » Wed Aug 24, 2016 5:11 pm

It sounds pretty good, but not "Hollywood quiet"... I'm still tuning my loads and action. The gun has an adjustable gas block that I'm trying to tweak to cycle both suppressed subs and supers. I built this can to handle up to 300 Win Mag, and realize it's not the best design for low pressure rounds like the 300BO. I also plan to use it on my AR10 .260 and Rem 700 308 VS-SF. Thanks for the positive feed back.
My next approved Form1 is for a 5.56 cal I'm planning to build with the same mount and tube size, but with 9 cones...

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by nbw123 » Wed Aug 24, 2016 10:37 pm

2-3 cones followed by K's is a great combo for 762 and 300bo

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by Wicked » Tue Sep 13, 2016 3:35 am

That's 'effin SWEET! Nice job. Very clean.
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1rflman
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by 1rflman » Fri Sep 23, 2016 4:23 pm

I did some POI testing with my suppressor over the weekend, and took a pic of a couple targets I shot. The left target was shot with my AR 300BO at 50 yds, and shows the 2 groups: with and without the suppressor. The right target was shot with my Rem 700 .223 varmint at 100 yds, also showing the details of my test. Although both suppressed groups show a drop in elevation, I believe the Rem 700 group POI shift is mainly due to the weight of the suppressor on its 24" barrel. I built this suppressor strong enough to handle up to a 300 Mag using the stainless MAAD mount, 17-4 adapter and 17-4 end cap for a total weight of 25 oz.
Image

The end cap has an internal 60* cone with a .375" hole, and a 50* exit cone. I have all clips lined up and oriented at 6:00 when mounted on the 300BO, but since the AAC 51T Brakeout muzzle devices do not have universally-timed external threads, the clips are oriented at about 7:30 on the Rem 700 (looking down range). The suppressor sounded very good on the Rem 700 too, with the usual sonic crack from the 3350 fps .223 ammo.

PS: I was shooting next to a contractor doing testing for a commercial suppressor manufacturer who commented that my Form1 on the 300BO was the quietest he has heard on that caliber. Just saying... :D

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by yondering » Sat Sep 24, 2016 2:37 am

That's a good looking can, especially the end cap. I'd be interested to see the inside of that cap, if you have a pic.

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by 1rflman » Mon Sep 26, 2016 5:10 pm

Here's a pic of the inside of my cap:
Image

The walls are .5" deep, with a center .1" step and a .250" high 60* cone. The hole is .375" for .075", before flaring outward at 50*.

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by yondering » Tue Sep 27, 2016 2:45 am

Nice, thanks for the pic.

Now that you've used it, do you feel like the 50* exit cone was a good idea? I'm planning to make a similar end cap for mine (also a 30 cal), and have been pondering different ways to incorporate a cone in it without making a long bore section.

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by 1rflman » Tue Sep 27, 2016 3:54 pm

The internal cone was originally the size of the step diameter, and had a bore "depth" of .350" (and no exit cone) when I first tested the can. The suppression was OK, but I believed it should be better. I modified it to this design and noticed it was a lot quieter, estimated at about 10 - 12 less decibels by ear, no meter. I built the cap with a large internal cone thinking it was a bonus baffle, without lengthening the tube, but I concluded that the long bore limits the suppression even more than the cone's benefit. This finding was also discussed on form1suppressor board a couple weeks ago.

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by whiterussian1974 » Tue Sep 27, 2016 4:57 pm

What if you had drilled expansion tubes between the inner and outer cones?
Like the various designs in the inset boxes, and in blue at the lower right hand of pic.
Also shown on the sectioned can at its exit cap.

Image
Again, Beautiful work!
The Darkest Corners of Hell are reserved for those who remain Neutral!-Dante
The Death of One is a Tragedy, a million only a statistic.-Stalin
Well I AM 1/16 Demon on my Father's Side!-Dresden Files

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by yondering » Tue Sep 27, 2016 8:25 pm

whiterussian1974 wrote:What if you had drilled expansion tubes between the inner and outer cones?
That's the other method I was considering.

Great info from the OP, thanks!

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by curtistactical » Tue Sep 27, 2016 9:14 pm

Nice work!
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by 1rflman » Thu Sep 29, 2016 6:06 pm

I considered drilling 4 or 8 small holes, about .100 to .125, through the cap into the flutes on the front, to allow greater "disbursement" of the gas, but was worried it would make the can louder. After looking at a lot of commercial silencers' designs, I couldn't find any with multiple holes in the end cap, so I decided against it. Maybe some other suppressor builders have experimented with this?

Thanks again for the compliments...

Joe, I used your advice on the clipping style for the .125" stepped cut, and I actually saw this on the Sig SRD762 cutaway at their booth in Louisville. Have you tested this style on a radial/frustro type cone in a pistol can? All of the pics of commercial pistol cans I've seen are still using the "U" shaped clip... Thanks for your help.

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by whiterussian1974 » Thu Sep 29, 2016 6:18 pm

1rflman wrote:I considered drilling 4 or 8 small holes, about .100 to .125, through the cap into the flutes on the front, to allow greater "disbursement" of the gas,
Maybe some other suppressor builders have experimented with this?
Gunny50 does. It works GREAT for him. :wink:
The choke point limits the flow through the endcap. The air that would go through 1 hole, now spreads through a larger surface area and several different vectors. So less abrupt upset at each exhaust point. Thus, less blast-generated noise creation.
---
You still did a great job. The Exhaust mixes through Inner and Outer flow cones. But several ports would have created a "diffuser." Moving a larger Bulk of intermixed air, at lower velocity.
The Darkest Corners of Hell are reserved for those who remain Neutral!-Dante
The Death of One is a Tragedy, a million only a statistic.-Stalin
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by andromax » Sat Nov 05, 2016 11:19 pm

Tell me about those flutes, did you end up with 8 or. 9?

What size ball mill? How deep?
I like it!
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by daPhoosa » Sun Nov 06, 2016 12:20 pm

Very nice can.

Now I really want to paint my can with Cerecoat heat transfer gray.
My form 1 build: http://www.silencertalk.com/forum/viewtopic.php?f=10&t=136387

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by 1rflman » Mon Nov 07, 2016 11:40 pm

There are 12 flutes, 3" long. I used a 1/2" ball end mill, but the flutes are only .015" deep. The titanium tube has .070" thick walls. Also, the step to the front of the tube is only .010" deep. The flutes and step are mainly cosmetic, and have negligible weight reduction.

Be sure to post pics of your Cerakote paint job.

...Thanks for the comments. :D

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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by Hard_ware » Sun Nov 20, 2016 11:34 am

Very nice!

Getting a reading on the db reduction would have been nice.
Hard to know if any improvements are possible without it, this based on comment made by contractor.

End porting final chamber may help depending on pressure within chamber, diffusing high pressure gasses to atmosphere over change in time is the key to subsonic suppression.

In supersonic, keeping noise level under sonic crack is all that's needed.
Mitigating blast and eliminating fireball (especially for night use) is all I care about.
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Re: 30 cal 1.625" Titanium w/MAAD 51T

Post by JulietDeltaCustoms » Sun Nov 20, 2016 6:15 pm

Wow! What a juicy build. I'm doing something similar to this for a customer this week. I've been taking my time warming up to cutting the titanium, and trying to conduct as much research as possible. Can I ask what kind of machines you used to mill the flutes and turn the reduction?

Beautiful work, by the way! Very inspiring.
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