Search found 1045 matches

by Fulmen
Fri Nov 03, 2017 2:46 pm
Forum: Silencer Talk
Topic: Keyholing and what manufacturers are telling me
Replies: 5
Views: 1794

Re: Keyholing and what manufacturers are telling me

While the barrel is the most obvious culprit it's impossible to say for sure without examining both barrel and silencer. 30% keyholing without any visible marks in the can suggests a "glancing blow" inside the can, which means that the error is marginalt. Even minor and totally acceptable deviations...
by Fulmen
Sun Oct 29, 2017 11:51 am
Forum: Silencersmithing Forum
Topic: Budget 3D printed baffles?
Replies: 7
Views: 2665

Re: Budget 3D printed baffles?

I see your points, FFT does have some benefits. I hadn't considered soluble filaments, that could increase versatility quite a bit. And as you say, with the proper orientation you should be able to remove most overhang. Still, SLA-made for the amateur marked seems like a very nice development. A fri...
by Fulmen
Sun Oct 29, 2017 11:05 am
Forum: Silencersmithing Forum
Topic: Budget 3D printed baffles?
Replies: 7
Views: 2665

Re: Budget 3D printed baffles?

I also would not jump right to SLA Care to elaborate on this point? I've never had any interest in FFT, I don't have to try that to see that it requires a lot of trial&error. They also have serious limitations when it comes to "overhang" and such. Without any experience SLA seems like a superior me...
by Fulmen
Sat Sep 30, 2017 8:01 am
Forum: Silencer Talk
Topic: What Makes A Suppressor "Rated" For A Caliber?
Replies: 14
Views: 2587

Re: What Makes A Suppressor "Rated" For A Caliber?

Calculating actual stresses in a silencer is exceedingly hard. Predicting muzzle pressures is simple with software like Quickload, but once gas enters the can it becomes very complicated. I would assume most mfgs use a combination of CFD, FEA, experience and testing to ensure integrity. For the end ...
by Fulmen
Fri Sep 29, 2017 3:46 pm
Forum: Silencer Talk
Topic: What Makes A Suppressor "Rated" For A Caliber?
Replies: 14
Views: 2587

Re: What Makes A Suppressor "Rated" For A Caliber?

my point is the exit pressure is not going to be more than the chamber pressure That is correct, but not very useful. Muzzle pressures for normal rifle rounds will generally be around 10-30% of chamber pressure, so the chamber pressure isn't very relevant when designing a silencer. Muzzle pressure ...
by Fulmen
Fri Sep 29, 2017 11:17 am
Forum: Silencer Talk
Topic: What Makes A Suppressor "Rated" For A Caliber?
Replies: 14
Views: 2587

Re: What Makes A Suppressor "Rated" For A Caliber?

if you limit how much pressure you are going to have in the chamber (saami), the other is going to be affected proportionately Not really. Here's two loads from QL, 300BLK/16" barrel: 1. 125 Sierra/19grs H110: Chamber: 50.5ksi Muzzle: 4.8ksi 2. 240 Sierra/5.4grs HS6: Chamber: 55ksi Muzzle: 1.0ksi
by Fulmen
Fri Sep 29, 2017 1:52 am
Forum: Silencer Talk
Topic: What Makes A Suppressor "Rated" For A Caliber?
Replies: 14
Views: 2587

Re: What Makes A Suppressor "Rated" For A Caliber?

Not sure I follow... SAAMI (or CIP for that matter) doesn't regulate muzzle pressure in any way. It will of course be lower than peak pressures, but they're not related in any way. A simple way to compare two rounds would be to divide the powder charge by total volume (a rough estimate valid for nor...
by Fulmen
Thu Sep 28, 2017 6:28 pm
Forum: Silencer Talk
Topic: What Makes A Suppressor "Rated" For A Caliber?
Replies: 14
Views: 2587

Re: What Makes A Suppressor "Rated" For A Caliber?

if chamber pressures and muzzle velocity are basically the same, and the projectile is smaller in diameter, then wouldn't one be able to safely extrapolate that both rounds are safe for a particular suppressor? Not really. A 300 delivers similar speeds & weights with less powder. The bore is also l...
by Fulmen
Thu Sep 28, 2017 5:13 pm
Forum: Silencer Talk
Topic: What Makes A Suppressor "Rated" For A Caliber?
Replies: 14
Views: 2587

Re: What Makes A Suppressor "Rated" For A Caliber?

Muzzle pressure has little to do with maximum chamber pressure. It depends mainly on the amount of powder and the total volume of the chamber/barrel.
by Fulmen
Wed Sep 27, 2017 3:57 pm
Forum: Silencersmithing Forum
Topic: See through silencer w/slow motion silencer testing
Replies: 28
Views: 4429

Re: See through silencer w/slow motion silencer testing

The particles are extremely small, far too small to be seen. The physics is basically the same as in a burning candle. The problem is that the flash pretty much obscures everything behind it, so you're only seeing the outside of this bubble. And the most interesting physics happens on the inside. I'...
by Fulmen
Wed Sep 27, 2017 2:01 am
Forum: Silencersmithing Forum
Topic: See through silencer w/slow motion silencer testing
Replies: 28
Views: 4429

Re: See through silencer w/slow motion silencer testing

Studying the blast bubble movement can very be very beneficial on how the pressure is moving and reacting to different baffle styles. The problem as I see it is that it's a high pressure front moving quickly through the can while the internal pressure is low. What's important is how the gases flow ...
by Fulmen
Tue Sep 26, 2017 3:26 pm
Forum: Silencersmithing Forum
Topic: See through silencer w/slow motion silencer testing
Replies: 28
Views: 4429

Re: See through silencer w/slow motion silencer testing

garredondojr wrote: the reason their is a flash is the presence of O2 in the can
The flash is due to the temperature of the gas exiting the barrel. Or to be more precise, it's glowing particles of soot within that gas. Want proof?
https://imgur.com/gallery/OX84RQV

No atmosphere and a huge fireball.
by Fulmen
Tue Sep 26, 2017 4:29 am
Forum: Silencersmithing Forum
Topic: See through silencer w/slow motion silencer testing
Replies: 28
Views: 4429

Re: See through silencer w/slow motion silencer testing

I think that will open a whole new can o' worms as far as R&D is concerned Nah, I doubt it. You can't really see the flow, all you see is the flash filling the can. Secondly it doesn't matter how it looks, only how it meters. It would probably be useful for "calibrating" CFD simulations, but I don'...
by Fulmen
Thu Sep 14, 2017 3:54 am
Forum: Legal and Political
Topic: HAPPENING NOW.... Tune in
Replies: 11
Views: 1274

Re: HAPPENING NOW.... Tune in

But to be fair, and honest, aren't silencers mostly about fun? They're right about hearing protection tech being fairly advanced these days. I mean for about 1/3 the cost of a decent commercial silencer one can have custom moulded in-ear electronic active protection, noise cancelling sort of thing....
by Fulmen
Mon Sep 11, 2017 8:44 am
Forum: Silencer Talk
Topic: Over the barrel suppressors
Replies: 7
Views: 1542

Re: Over the barrel suppressors

It's not that complicated.

For any given total length (or weight) they will be (slightly) less effective than a straight front-mounted can. For any given added length (in front of the muzzle) they will be more effective.
by Fulmen
Sat Sep 09, 2017 12:41 pm
Forum: Silencersmithing Forum
Topic: photobucket fix
Replies: 3
Views: 1469

Re: photobucket fix

Great tip, works like a charm
by Fulmen
Tue Aug 15, 2017 4:42 pm
Forum: Silencersmithing Forum
Topic: Drilling Misshap
Replies: 62
Views: 13031

Re: Drilling Misshap

Its 17-4PH. Carbide Depot is recommending that I have a SFM of 30-60 while the Morse cutting tools website is recommending 20. I found a 220 RPM drill press I'll pick it up and use it to get a SFM of 19.7. He/you were pushing 60sfm which is quite high for hard steels. 30 would probably be safe (ass...
by Fulmen
Mon Jul 17, 2017 2:39 am
Forum: Silencersmithing Forum
Topic: Tube erosion?
Replies: 14
Views: 2353

Re: Tube erosion?

I agree, aluminum cans can corrode quite fast if not properly cared for. But without having seen it it's just speculation on my side.

That being said, aluminum centerfire cans are more common than roadkill around here, have yet to see a can with erosion at the outer walls.
by Fulmen
Sat Jul 15, 2017 5:42 pm
Forum: Silencersmithing Forum
Topic: Tube erosion?
Replies: 14
Views: 2353

Re: Tube erosion?

CL: Was it erosion or deformation from the heat&pressure?
by Fulmen
Fri Jul 14, 2017 4:59 pm
Forum: Silencersmithing Forum
Topic: Tube erosion?
Replies: 14
Views: 2353

Re: Tube erosion?

Short answer: I doubt it. The velocity will be greatest at the bore, at the periphery the gas will flow slower and any erosion will be distributed over a much larger area. So except for the blast chamber (especially with an internal brake) I wouldn't worry too much about it. I put a grade 2 Ti space...
by Fulmen
Sat Jul 08, 2017 5:03 am
Forum: Silencersmithing Forum
Topic: POI shift with different can weights
Replies: 9
Views: 1770

Re: POI shift with different can weights

doubloon wrote:Expanding gas under pressure is a tremendously dynamic environment for physics.
Well said. A silencer is a veritable treasure chest of extreme physics.
by Fulmen
Sat Jul 01, 2017 4:32 am
Forum: Silencersmithing Forum
Topic: Max suppressor weight for recoil booster
Replies: 15
Views: 2889

Re: Max suppressor weight for recoil booster

You're not even in the right ballpark for a pistol can. Start by checking the weight of commercial cans, this will tell you how heavy you can go without getting into trouble.
by Fulmen
Thu Jun 15, 2017 4:44 pm
Forum: Legal and Political
Topic: That jackass Hodgkinson
Replies: 9
Views: 1323

Re: That jackass Hodgkinson

I consider religious nutjobs right-wing.

I'm not saying left wingnuts can't turn to terror, we've seen a lot of this in past times. But when it comes to lone shooters in later years I have the distinct impression most are right wing fanatics.
by Fulmen
Thu Jun 15, 2017 4:39 am
Forum: Legal and Political
Topic: That jackass Hodgkinson
Replies: 9
Views: 1323

Re: That jackass Hodgkinson

Jackass? Really? A man shoots unarmed people and that's the worst name you could think of? That tells me you've become a bit to blase to these mass shootings. Also, it is interesting to see a left wing fanatic going postal. It's usually right wing fanatics, but the way things are turning I wouldn't ...
by Fulmen
Sat Jun 10, 2017 5:31 pm
Forum: Silencersmithing Forum
Topic: why no 3 lug with supersonic?
Replies: 12
Views: 2785

Re: why no 3 lug with supersonic?

HK has used the tri-lug for decades, they don't have any such limits on their HW.