Search found 512 matches

by ECCO Machine
Mon Sep 30, 2019 7:34 am
Forum: Silencer Talk
Topic: Suppressor Baffle Bullet hole size
Replies: 1
Views: 556

Re: Suppressor Baffle Bullet hole size

Generally .040"-.060" over bullet diameter. Some intended more for use on gas operated guns may be overbored to reduce backpressure
by ECCO Machine
Sat Sep 28, 2019 12:56 am
Forum: Silencersmithing Forum
Topic: Group buy 60* cones
Replies: 7
Views: 1100

Re: Group buy 60* cones

FRANKIEBOOMS wrote:
Fri Sep 27, 2019 11:41 pm
Sorry new to this, but how many baffles would fit in an 8 inch tube, these seem to be exactly what I am looking for?
Depends on what you're trying to suppress. 9mm or 300 Blk subsonic, 12+. .308 Supersonic, go with 9. 5.56? Do a shorter tube with 5 or 6.
by ECCO Machine
Fri Sep 27, 2019 11:35 pm
Forum: Silencer Talk
Topic: Suppressor on Ruger PC9 Carbine?
Replies: 11
Views: 4600

Re: Suppressor on Ruger PC9 Carbine?

That's the nice thing about AR based carbines; can add lots of mass to retard bolt opening. I haven't tried anything else through it yet and probably won't, as this stuff cycles so well and delivers excellent accuracy. Try Fiocchi 158 gr. It's a little more expensive than the cheap 147 gr. stuff, bu...
by ECCO Machine
Fri Sep 27, 2019 9:50 pm
Forum: Silencer Talk
Topic: Suppressor on Ruger PC9 Carbine?
Replies: 11
Views: 4600

Re: Suppressor on Ruger PC9 Carbine?

Hi ECCO. Sounds like you've tested holding the bolt closed, if you're saying it hurts. So I'm wondering if you have a guess as to how much metal might be needed to assure reliable, durable bolt restraint, as an add-on for a 9mm PCC. Have a different model of 9mm takedown carbine and more specifical...
by ECCO Machine
Thu Sep 26, 2019 11:34 pm
Forum: Silencer Talk
Topic: Suppressor on Ruger PC9 Carbine?
Replies: 11
Views: 4600

Re: Suppressor on Ruger PC9 Carbine?

The port pop on those is real. I did a huge volume integral for a fellow, a 1.75" ID with a 1.375" OD three cone, ten K baffle core and a the rest of the volume a big honkin' coaxial chamber to reduce backpressure, and even that was snappy to the ear (silly quiet if you held the bolt, closed, though...
by ECCO Machine
Fri Sep 20, 2019 1:53 am
Forum: Silencersmithing Forum
Topic: Turning 17-4 (A)
Replies: 27
Views: 1997

Re: Turning 17-4 (A)

Or maybe the surface finish is so nice with 17-4 I've been spoiled and 416 cuts like it always has. Pretty much. If you want a nice as-machined finish on annealed 400 series, you need to hone & polish inserts like you would HSS. Or you can just deal with it after the fact using files and sand paper...
by ECCO Machine
Thu Sep 19, 2019 9:56 pm
Forum: Silencersmithing Forum
Topic: Turning 17-4 (A)
Replies: 27
Views: 1997

Re: Turning 17-4 (A)

The pic doesn't do it justice - it was a beautiful golden straw color with black streaks and bright magenta swarf! And the dang thing kept cutting just fine. Those inserts sure do put up with more abuse than my HSS tooling. They will, but it embrittles them and they start to chip or fracture. High ...
by ECCO Machine
Tue Sep 17, 2019 9:17 am
Forum: Silencersmithing Forum
Topic: Turning 17-4 (A)
Replies: 27
Views: 1997

Re: Turning 17-4 (A)

Still getting long stringy swarf, but I know how to deal with that. That's pretty much unavoidable unless you keep up very aggressive feed rates. I've tried all kinds of different inserts with different chip breaking patterns, little difference. 17-4 is just tough stuff. I usually grab the strings ...
by ECCO Machine
Thu Sep 12, 2019 11:44 am
Forum: Silencersmithing Forum
Topic: Internal ballistics
Replies: 18
Views: 971

Re: Internal ballistics

Thanks brother and yeah i am making a hunting can that is as light as it could possibly be This is my Phantom 8 model, 300 win mag rated. 1.5" x 8", Weighs 9 oz https://i.imgur.com/EuOKX7x.jpg -.035" wall gr. 9 CWSR tube, threaded 36 pitch -Gr. 5 Ti mount w/integral helix port brake -Gr. 5 Ti front...
by ECCO Machine
Wed Sep 11, 2019 10:15 pm
Forum: Silencersmithing Forum
Topic: Internal ballistics
Replies: 18
Views: 971

Re: Internal ballistics

Unless you're trying to get away with sub par materials or really push the envelope to see how thin & light you can go, don't overthink this. Any Ti or stainless seamless tube you can feasibly thread with 32 pitch or coarser will contain 300 blk. of any flavor
by ECCO Machine
Fri Sep 06, 2019 12:52 pm
Forum: Silencersmithing Forum
Topic: Internal ballistics
Replies: 18
Views: 971

Re: Internal ballistics

You don't need a computer program to calculate that. You do have to operate under the assumption of certain chamber pressures, though, whether using a computer or doing the math yourself. Unless you happen to have the equipment for testing that... Boyle's law is a very simple calculation; for every ...
by ECCO Machine
Fri Aug 16, 2019 6:17 pm
Forum: Silencersmithing Forum
Topic: F1 30cal can on a 22LR
Replies: 9
Views: 1084

Re: F1 30cal can on a 22LR

I wasn’t familiar with that can. Everything else I saw was mostly 7-9 baffles. I don’t want to sound doubtful on your suggestion, I’m just trying to figure out why only one company does it this way and the rest do it a bit different. I know cost is a huge factor, especially on production scale so I...
by ECCO Machine
Fri Aug 16, 2019 1:34 am
Forum: Silencersmithing Forum
Topic: F1 30cal can on a 22LR
Replies: 9
Views: 1084

Re: F1 30cal can on a 22LR

Out of curiosity, does anyone commercially make a .22lr suppressor in ~0.9” ID, 5.5”-6” length, with 10-12 cones? Seems there are a few that match two of the three but I didn’t see anything that was all of the above made from a major manufacturer. Well, yeah https://i.imgur.com/TXWCe1o.jpg The TBAC...
by ECCO Machine
Fri Aug 16, 2019 1:04 am
Forum: Silencersmithing Forum
Topic: Suppressor can without tax stamp
Replies: 3
Views: 1587

Re: Suppressor can without tax stamp

Can you buy the can without baffle stack without tax stamp? Reason being I would like to form one my own baffle design inside of a SureFire outer shell. Why not just buy a thick steel tube and wrap it with lead sheet if you want the feel of a SF can? Lol. Seriuosly, though, SF stuff is among the lo...
by ECCO Machine
Thu Aug 15, 2019 3:40 pm
Forum: Silencersmithing Forum
Topic: Baffles rattle in the tube?
Replies: 5
Views: 783

Re: Baffles rattle in the tube?

How about making the tube a tad shorter? This. Or shim it. Don't use springs, O-rings or other compressible items. Remember, not only are you dealing with high pressures, but that as the bullet passes through each aperture, the differential from back side to front will change, more than once. Basic...
by ECCO Machine
Thu Aug 15, 2019 2:12 am
Forum: NFA Weapons
Topic: Question Regarding Eform Form 2 for 07/02 FFL SOT
Replies: 2
Views: 500

Re: Question Regarding Eform Form 2 for 07/02 FFL SOT

It will always show "pending research" on any new model you submit for a few days. F2 gets filed when the weapon is "done", and not before. I have a chicom S&S with 10" barrels on it in the shop that's still not F2'd. I cut the damaged stock down to a pistol grip, and quickly discovered it's simply ...
by ECCO Machine
Thu Aug 15, 2019 2:01 am
Forum: Silencer Talk
Topic: Subsonic Ammo for B&T GHM45/APC45
Replies: 3
Views: 653

Re: Subsonic Ammo for B&T GHM45/APC45

Why not just buy ball ammo like you find on the shelf at walmart or anywhere else? All standard pressure 230 gr loads will be sub, even from SBRs.
by ECCO Machine
Thu Aug 15, 2019 1:21 am
Forum: Silencersmithing Forum
Topic: Gemtech vs Sparrow vs Cone design?
Replies: 8
Views: 1131

Re: Gemtech vs Sparrow vs Cone design?

guys!!! please do not leave the main topic \ question. Question was : 1) 5,56 2) three types of monocore design You asked for and received advice. If you don't want to listen to those of us with experience on the matter, why bother asking the question? Once again, none of those 3 designs, nor any o...
by ECCO Machine
Tue Aug 13, 2019 11:09 pm
Forum: Silencersmithing Forum
Topic: Gemtech vs Sparrow vs Cone design?
Replies: 8
Views: 1131

Re: Gemtech vs Sparrow vs Cone design?

None. Monocores suck. They work ok on .22 rifles, that's about it. I spent a fair amount of time trying to "build a better mousetrap" experimenting with all kinds of monocore designs. There's a reason every one of my suppressor models have conical baffles.
by ECCO Machine
Wed Aug 07, 2019 3:34 am
Forum: Silencersmithing Forum
Topic: 30 cal Suppressor Build - Forum 1
Replies: 65
Views: 5293

Re: 30 cal Suppressor Build - Forum 1

gun410 wrote:
Mon Aug 05, 2019 11:44 am
if i'm thinking about this right won't i get the wrong hand thread (left hand) in this configuration?
As long as you're threading toward the spindle with the lathe running forward, you get right hand threads. If you thread away from the spindle running forward, you will cut LH threads.
by ECCO Machine
Tue Aug 06, 2019 8:20 pm
Forum: Silencersmithing Forum
Topic: F1 30cal can on a 22LR
Replies: 9
Views: 1084

Re: F1 30cal can on a 22LR

Thanks for the insight. I’m just torn between building a 30cal to use on my Remmy as well as on a Ruger 10/22 or simply build a dedicated 22can and purchase a commercial 30cal can. Got an email confirmation from the Feds this morning so it shouldn’t be long now. Thanks again Build both. The can you...
by ECCO Machine
Fri Aug 02, 2019 11:35 am
Forum: Silencersmithing Forum
Topic: New cat on the block.....
Replies: 9
Views: 687

Re: New cat on the block.....

Certainly. 1.5" x 8"-9" is pretty much the sweet spot for a .30 rifle can. My two production .30 models are Valkyrie (1.5" x 8") and Furtivus (1.5" x 9"). You'll find that most other manufacturers have one or more .30 model in that size range.
by ECCO Machine
Thu Aug 01, 2019 5:57 pm
Forum: Silencersmithing Forum
Topic: 30 cal Suppressor Build - Forum 1
Replies: 65
Views: 5293

Re: 30 cal Suppressor Build - Forum 1

I guess I’ll just knock down my 11ir inserts. But the 2mm growing tool I posted above wont even get Low enough to be centered (not even close). So I know my 3mm one coming won’t work either, what can I do? Move your tool post over so the holder can drop down past the compound. Also what class threa...
by ECCO Machine
Wed Jul 31, 2019 9:14 pm
Forum: Silencersmithing Forum
Topic: 30 cal Suppressor Build - Forum 1
Replies: 65
Views: 5293

Re: 30 cal Suppressor Build - Forum 1

What inserts do u buy for threading that have a radius and not a sharp v? There are pitch specific inserts for both external (NTCR24E, for example, is for cutting 24 pitch right hand external threads) and internal (16IR24 would be a 24 pitch laydown insert). I don't generally bother with pitch spec...
by ECCO Machine
Wed Jul 31, 2019 5:28 pm
Forum: Silencersmithing Forum
Topic: 30 cal Suppressor Build - Forum 1
Replies: 65
Views: 5293

Re: 30 cal Suppressor Build - Forum 1

I was looking around the lathe and i found this carbide parting tool. It is a different style than yours but there can't be too big of a difference? Same style, but that's a holder for MGMN200, which are 2mm wide. 200s are a little light, and the -2 holders don't have as much reach for parting larg...