Search found 99 matches

by BinaryAndy
Thu Oct 11, 2018 8:05 am
Forum: Silencersmithing Forum
Topic: Sub $1k lathe including shipping 8x16 with 5” chuck 1.5” pass thru
Replies: 87
Views: 26584

Re: Sub $1k lathe including shipping 8x16 with 5” chuck 1.5” pass thru

I wouldn't count on it fitting a 1.5" bar, and if it does I wouldn't count on the spindle bore being concentric enough to hold it properly. That said, it has an MT5 spindle taper, the small end of which is supposed to be about 1.55", so it's certainly plausible that it might work. 1-3/8 or even 1-7/...
by BinaryAndy
Mon Aug 27, 2018 12:58 pm
Forum: Silencersmithing Forum
Topic: looking to buy very first lathe
Replies: 12
Views: 1938

Re: looking to buy very first lathe

If you want something brand new, try to get something Taiwanese if you can afford it. They tend to be made much better than the Chinese options, and they usually use better spindle bearings, which is very important. If used is an option, the Japanese and Korean machines are generally best suited to ...
by BinaryAndy
Fri Mar 02, 2018 1:34 am
Forum: Silencersmithing Forum
Topic: materials
Replies: 27
Views: 4750

Re: materials

So, annealed 4130 is only slightly weaker than titanium. No one really argues that titanium is unfit for building cans, right? Compared to Grade 9 Ti that's correct, although of course it's significantly more dense than titanium so a can made from 4130 will necessarily be heavier. Grade 5 Ti is a l...
by BinaryAndy
Sat Feb 24, 2018 5:07 pm
Forum: Silencersmithing Forum
Topic: Hard chrome plating baffles for abrasion resistance at home
Replies: 39
Views: 5022

Re: Hard chrome plating baffles for abrasion resistance at home

Nitriding is surprisingly inexpensive per part. It's relatively expensive to do one silencer because there's always a fairly high minimum order (a $250 minimum is common), but with ten silencers I'd be very surprised if you were over $400, and I wouldn't be surprised if you were still under the mini...
by BinaryAndy
Sat Feb 24, 2018 1:52 am
Forum: Silencersmithing Forum
Topic: Hard chrome plating baffles for abrasion resistance at home
Replies: 39
Views: 5022

Re: Hard chrome plating baffles for abrasion resistance at home

Well, for one, chrome lined barrels predate the development of commercially viable electroless nickel. I'm sure there are other reasons as well, and some of them just might have some relevance to silencers. I was not referring to hydrogen embrittlement. Hard chrome, because of how the coating forms,...
by BinaryAndy
Fri Feb 23, 2018 4:39 am
Forum: Silencersmithing Forum
Topic: Hard chrome plating baffles for abrasion resistance at home
Replies: 39
Views: 5022

Re: Hard chrome plating baffles for abrasion resistance at home

H1150 is certainly not the same as annealed, T-Rex is correct. And no, you absolutely cannot heat treat 17-4 with a torch. As a precipitation hardening alloy, you have to hold it ("age" it) at the heat treating temperature (900° for H900) for one to four hours. Annealing and heat treating again will...
by BinaryAndy
Thu Feb 22, 2018 2:23 pm
Forum: Silencersmithing Forum
Topic: Hard chrome plating baffles for abrasion resistance at home
Replies: 39
Views: 5022

Re: Hard chrome plating baffles for abrasion resistance at home

I don't think you talked to the right person about the cobalt. Electroless nickel is around 65 HRC, and cobalt is supposed to be harder. In any case, electroless nickel and salt bath nitriding both outperform chrome in nearly every way.

I would not recommend reworking the heat treatment.
by BinaryAndy
Tue Feb 20, 2018 12:56 pm
Forum: Silencersmithing Forum
Topic: Hard chrome plating baffles for abrasion resistance at home
Replies: 39
Views: 5022

Re: Hard chrome plating baffles for abrasion resistance at home

propeine wrote: I think blacknitride.com has their SOT.
Can confirm. Can also recommend.
by BinaryAndy
Mon Feb 19, 2018 9:19 pm
Forum: Silencersmithing Forum
Topic: Hard chrome plating baffles for abrasion resistance at home
Replies: 39
Views: 5022

Re: Hard chrome plating baffles for abrasion resistance at home

Pressure, yes, but not the kind of shock, and definitely not the temperatures. Fire 10 rounds through your AR as fast as you can, the barrel is warm to the touch. Your can, however, will burn your hand. Barrels are also much thicker than baffles or housings, so a lot more rigid backing for that pla...
by BinaryAndy
Thu Feb 08, 2018 11:06 pm
Forum: Silencersmithing Forum
Topic: 22LR Form 1 Suppressor w/ AAC-style K-Baffles
Replies: 26
Views: 9176

Re: 22LR Form 1 Suppressor w/ AAC-style K-Baffles

That holster. I need that holster.
by BinaryAndy
Thu Feb 08, 2018 7:40 pm
Forum: Silencersmithing Forum
Topic: materials
Replies: 27
Views: 4750

Re: materials

How does 4140 tube compare if it is not heat treated? I have seen more than a few builds mention using 4140 for tubes. Just wondering how well it would work for a centerfire rifle in say .223 or .308? Not favorably. Chromoly steels derive most of their strength from heat treatment. Annealed 4140 ha...
by BinaryAndy
Thu Feb 08, 2018 3:16 pm
Forum: Silencersmithing Forum
Topic: materials
Replies: 27
Views: 4750

Re: materials

I have not been able to find a source for 17-4 tube in quantities any less than a mill run of several thousand pounds, and I've spent a great deal of time searching. 4140 isn't available in tubing either, but 4130 is. If it's annealed it's nearly as strong as titanium, 60ksi. If it's cold worked and...
by BinaryAndy
Thu Feb 08, 2018 4:19 am
Forum: Silencersmithing Forum
Topic: materials
Replies: 27
Views: 4750

Re: materials

4000 series chromoly steels are not the strongest unless you use a low temper, and even then it only has a higher UTS than 17-4, but still a lower yield strength, and will be more brittle. Factor in the better thermal properties and corrosion resistance, it's easy to see why virtually all manufactu...
by BinaryAndy
Sun Feb 04, 2018 3:45 pm
Forum: Silencersmithing Forum
Topic: materials
Replies: 27
Views: 4750

Re: materials

Ti: light, expensive, difficult

17-4: very strong, cheaper, somewhat less difficult

4130, 4140, 4340: strongest, dirt cheap, easy to machine, needs heat treat and protective coating

For the tube your only good options are Ti and 4130, unless you go tubeless or make a tube from solid bar.
by BinaryAndy
Wed Jan 03, 2018 6:05 pm
Forum: Silencersmithing Forum
Topic: Gunsmithing without an FFL
Replies: 18
Views: 3300

Re: Gunsmithing without an FFL

There is a big difference, legally, for some reason, between silencer parts and SBR parts. Silencer parts are considered silencers themselves and are subject to NFA laws, while any part of an SBR except the receiver is unregulated. You could make a thousand 9" AR barrels, market them specifically fo...
by BinaryAndy
Mon Dec 25, 2017 12:07 am
Forum: Silencersmithing Forum
Topic: Which taper for suppressor mount to brake?
Replies: 29
Views: 4468

Re: Which taper for suppressor mount to brake?

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.fastenal.com/content/feds/pdf/Article%2520-%2520Screw%2520Threads%2520Design.pdf&ved=0ahUKEwi56MLum6TYAhUCRCYKHQwjBTQQFgheMAY&usg=AOvVaw3pFkPDryFHj0VwpsspbMxH https://books.google.com/books?id=TAWznUs54uwC&pg=PA20&lpg=PA20&dq=thread+e...
by BinaryAndy
Sun Dec 24, 2017 2:30 am
Forum: Silencersmithing Forum
Topic: Which taper for suppressor mount to brake?
Replies: 29
Views: 4468

Re: Which taper for suppressor mount to brake?

In the case of a coarse thread and a fine thread, with the same major diameter and length of engagement, the coarse thread will have a higher stripping strength, even though the pitch diameter and minor diameter are smaller. To me, that means the thread itself is stronger. Of course that only matter...
by BinaryAndy
Fri Dec 22, 2017 2:42 am
Forum: Silencersmithing Forum
Topic: Which taper for suppressor mount to brake?
Replies: 29
Views: 4468

Re: Which taper for suppressor mount to brake?

And in your case with a relatively obtuse taper, a course thread might be more prone to loosening on it's own. A 60 degree taper would hold on and align better than a square shoulder, but it wouldn't lock itself in place like a 20 degree taper would. Your approach of using a larger angle with finer ...
by BinaryAndy
Wed Dec 20, 2017 4:32 am
Forum: Silencersmithing Forum
Topic: Which taper for suppressor mount to brake?
Replies: 29
Views: 4468

Re: Which taper for suppressor mount to brake?

A fine threaded bolt is stronger than a coarse threaded bolt due to the larger minor diameter, but that is not true of the threads themselves. Coarser threads are stronger than finer threads. On a silencer tube you want relatively fine threads because they weaken the tube less, and for a direct thre...
by BinaryAndy
Wed Nov 29, 2017 12:19 am
Forum: Silencersmithing Forum
Topic: 422 SS for Baffles?
Replies: 12
Views: 2251

Re: 422 SS for Baffles?

Annealed 4140 has a yield strength of 60-70 ksi. Quenched and tempered 4140 has a yield strength of 150-250 ksi depending on the temper, and it will be harder and more wear resistant. Quenched but not tempered, it will be more brittle than you want. It makes a big difference. The same goes for 416 a...
by BinaryAndy
Wed Nov 29, 2017 12:14 am
Forum: Silencersmithing Forum
Topic: What equipment are you guys using to make monocores?
Replies: 10
Views: 3172

Re: What equipment are you guys using to make monocores?

Do you have any CNC machining experience? You've got a long road ahead of you if you don't. At the least, for production work with monocores, you'll need a vertical machining center (CNC mill) and a turning center (CNC lathe). You could get by without the mill if you got a lathe with live tooling an...
by BinaryAndy
Tue Nov 28, 2017 3:08 pm
Forum: Silencersmithing Forum
Topic: 422 SS for Baffles?
Replies: 12
Views: 2251

Re: 422 SS for Baffles?

4140 Silencer parts are usually thin enough that you can air quench them. No need for oil, just put them in front of a fan or blow compressed air at them. You'll get less movement that way. You'll want to temper everything afterwards. You can get a decent temper on 4140 by cranking up the oven in yo...
by BinaryAndy
Mon Nov 27, 2017 2:55 pm
Forum: Silencersmithing Forum
Topic: 422 SS for Baffles?
Replies: 12
Views: 2251

Re: 422 SS for Baffles?

416 and 422 are both good options. 422 especially has some pretty good properties at high temperatures. Neither has quite the strength of heat treated 4140 or 17-4, but they're stronger than anything else that's commonly used for suppressors. Are you saying 416 and 422 are easier to get and/or cheap...
by BinaryAndy
Thu Oct 05, 2017 8:24 pm
Forum: Silencer Talk
Topic: 22 Nosler Suppression?
Replies: 8
Views: 3093

Re: 22 Nosler Suppression?

I'll second everything Trooper said. Generally speaking, smaller bullets and larger cases are more sensitive to barrel length. So a 45 ACP would have practically the same velocity from a 5" barrel or a 30" barrel, but a 22 Eargesplitten Loudenboomer would be significantly faster from a 30" barrel th...
by BinaryAndy
Thu Sep 21, 2017 10:18 pm
Forum: Silencersmithing Forum
Topic: Why is no one using 416 Stainless Steel for a Monocore design.
Replies: 9
Views: 3474

Re: Why is no one using 416 Stainless Steel for a Monocore design.

Hot gasses interact directly with the throat area of a rifle barrel with a lot more heat and pressure than we see in a suppressor. I agree though, 17-4 is a better material for suppressors. It's also a better material for barrels, by the way. In both cases, 17-4 is more wear resistant and 416 is eas...