[ARCHIVED THREAD] - Plastic Muzzle Brake Update (Page 1 of 2)
Posted: 5/3/2013 2:36:32 PM EDT
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I like that you keep us updated, and you're right out front with the failures. As you've said, you just wanna see if it's do-able.
That said, I still don't think it's gonna work. I mean, if it shatters when you just drop test the brake alone, imagine when it has the added weight of a shotgun attached to it. Doubt the extra delrin will help much. |
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I like that you keep us updated, and you're right out front with the failures. As you've said, you just wanna see if it's do-able. That said, I still don't think it's gonna work. I mean, if it shatters when you just drop test the brake alone, imagine when it has the added weight of a shotgun attached to it. Doubt the extra delrin will help much. Yup. Things gonna explode when you shoot it. |
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It needs to be solid bud...but thanks |
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What are you cutting your gills with? Endmill correct? try a ball nose cutter. Radius's=strength! Yeah I've been thinking about that as well, following the strength of the arch. I'm going to make one with gills and without them. I also have two 1 foot rods 2 inches in diameter of different polymers that i will be making into brakes. If the Delrin doesn't hold up perhaps another polymer will. |
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this is kind of fun to keep up with. Dont foget to keep it updated. when's the shoot? After you lose the flat spots and mill the new ones or what? Hopefully the test shoot will be nest weekend. I do have a family and they do take precedence over this hobby lol. |
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Could I recommend either a glass filled plastic or a laminate like Micarta or G-10? I'm sure if those will be strong enough but they will be far more likely to survive. Recommend away sir!....I'll be trying different polymers. I have some low density and high density polypropylene I'm going to machine next week. |
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Could I recommend either a glass filled plastic or a laminate like Micarta or G-10? I'm sure if those will be strong enough but they will be far more likely to survive. Recommend away sir!....I'll be trying different polymers. I have some low density and high density polypropylene I'm going to machine next week. Interesting. 
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You kinda look like Steve Gonsalves from Ghost hunters. 
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So shoot the damn thing. No no no, he 6"2, ain't got no time fo 'DAT. Or an executive summary. What does that mean? No no what does DAT mean A DAT is a fat smelly guy with a bad haircut in stinky green coveralls. Usually the smell of stale beer will precede him into a room, and I wouldn't expect stimulating conversation, unless you like the word "fuck." |
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You kinda look like Steve Gonsalves from Ghost hunters.
http://media.masslive.com/television_impact/photo/ghost-hunters-steve-gonsalvesjpg-03882dd139815c2a_large.jpg http://glueimg.s3.amazonaws.com/stickers/huge/syfy/ghost_hunters_steve_gonsalves_tech_manager.png My wife and I don't think so lol |
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this is kind of fun to keep up with. Dont foget to keep it updated. when's the shoot? After you lose the flat spots and mill the new ones or what? Hopefully the test shoot will be nest weekend. I do have a family and they do take precedence over this hobby lol. well there's the problem right there. |
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I wish you would bump one thread so we can follow along by subscribing. I want to see how it goes, but I have to get lucky to see your threads Well I'll just bump this thread with updates and videos but also start a new thread for the guys not following this one...deal |
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this is kind of fun to keep up with. Dont foget to keep it updated. when's the shoot? After you lose the flat spots and mill the new ones or what? Hopefully the test shoot will be nest weekend. I do have a family and they do take precedence over this hobby lol. well there's the problem right there. I dont see how its a problem lol.....My hobby takes up enough time |
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I wish you would bump one thread so we can follow along by subscribing. I want to see how it goes, but I have to get lucky to see your threads Almost ready for the testing of the brakes. I'll be busy this weekend (my 2nd son will be born) but I hope to get out the weekend after. So far I have 4 brakes done made out of Delrin, high density polyethylene (HDPE), low density polyethylene (LDPE) and Torlon. The HDPE & LDPE are the same type of polymer that six pack rings are made from. |
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So shoot the damn thing. No no no, he 6"2, ain't got no time fo 'DAT. Or an executive summary. What does that mean? It means he won't get to the point. That's the reason I won't watch another of those videos. Well the point of the video series is the process at which I went about making the brakes. The next video will be the testing of the brakes. If your interested in this project thats the one you've all been waiting for. |
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I wish you would bump one thread so we can follow along by subscribing. I want to see how it goes, but I have to get lucky to see your threads GUESS WHAT WORKED THIS MEMORIAL DAY WEEKEND?...................................MY PLASTIC MUZZLE BRAKES!!!!!!!!!!! Well some failure but this is so awesome! lol Video to come this Friday if I have the time....if not I will upload and post as soon as Im done regardless of the day. |
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Dude, you are one awe inspiring MF'r. (no disrespect intended) The way you can manipulate that beast makes most men look like pussies. I piss and moan at the weight of my AR. So keep on, keepin on. Respect! Thank you very much sir! Im doing this because I love it. |
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A relatively inexpensive plastic that may not hold up to the heat, but should hold up well to impact forces would be UHMW (ultra high molecular weight polyethylene). With the Izod notched impact test UHMW does not break---except in cold weather. The material also has a very high abrasion resistance. It's only downside besides melting temperature is that it does not hold machined dimensions well. It tends to grow after machining.
ETA: Teflon also has very good breaking resistance, but it is soft and flexible after machining. It does hold machined dimensions well. It also withstands higher temperatures better than most plastics. It is not abrasion resistant, however. I'm not too familiar with PEEK that was mentioned above my post. |
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PEEK is fine plain, but it also comes glass, carbon fiber, PTFE, or aramid fiber reinforced. Check out the link for properties MatWeb also a good resource for other plastics properties.
From Wikipedia PEEK is a semicrystalline thermoplastic with excellent mechanical and chemical resistance properties that are retained to high temperatures. The Young's modulus is 3.6 GPa and its tensile strength 90 to 100 MPa.[4] PEEK has a glass transition temperature at around 143 °C (289 °F) and melts around 343 °C (662 °F). The thermal conductivity increases nearly linearly versus temperature between room temperature and solidus temperature.[5] It is highly resistant to thermal degradation as well as attack by both organic and aqueous environments. It is attacked by halogens and strong Bronsted and Lewis acids as well as some halogenated compounds and aliphatic hydrocarbons at high temperatures. It dissolves completely in concentrated sulfuric acid at room temperature.
Applications Because of its robustness, PEEK is used to fabricate items used in demanding applications, including bearings, piston parts, pumps, HPLC columns, compressor plate valves, and cable insulation. It is one of the few plastics compatible with ultra-high vacuum applications. PEEK is considered an advanced biomaterial used in medical implants. It is extensively used in the aerospace, automotive, teletronic,[clarification needed] and chemical process industries.[6] PEEK's mechanical properties at elevated temperatures have led to it being used in at least two varieties of Reprap extruder as thermal insulation. This means the main mechanical structure of the extruder can be made of the same material that is being extruded, provided that the PEEK insulator prevents heat from traveling beyond the intended melt zone. A disadvantage is the high price, which limits its application to high value items. |
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If you're intent on making it from plastic, I recommend PEEK ( Polyether ether ketone) It's expensive, but it will hold up. I've been in the business for a long time. The polymers I'll be testing are Delrin, high density polyethylene, low density polyethylene, and Torlon (it was donated lol). The hole point is to see which is the cheapest polymer to use. Everyone might be shocked at the findings lol. |
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A relatively inexpensive plastic that may not hold up to the heat, but should hold up well to impact forces would be UHMW (ultra high molecular weight polyethylene). With the Izod notched impact test UHMW does not break---except in cold weather. The material also has a very high abrasion resistance. It's only downside besides melting temperature is that it does not hold machined dimensions well. It tends to grow after machining. ETA: Teflon also has very good breaking resistance, but it is soft and flexible after machining. It does hold machined dimensions well. It also withstands higher temperatures better than most plastics. It is not abrasion resistant, however. I'm not too familiar with PEEK that was mentioned above my post. Ive made two brakes out of polyethylene. One in high density and one in low density. The HDPE will surprise people I think lol. |