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greenlight
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I agree with what Nux said, place detonator as shallow as you can so as to allow maximum head height for a nice detonation wave to form before it
interacts with the cone tip.
Also make sure the detonator is well centered.
Be good, otherwise be good at it 
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Zyxel
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Detonator protrudes only 4mm in explosive.What is best standoff.I use 3,5 CD.
Would beryllium copper made better results?
 
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nux vomica
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Quote: Originally posted by Zyxel  | Detonator protrudes only 4mm in explosive.What is best standoff.I use 3,5 CD.
Would beryllium copper made better results?
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Looking good Zyxel 4mm is plenty of depth.
Pure copper is fine.
3.5 is a good starting point you could try 4 x if you have machined the cone with precision and your build alignment is accurate at least the charge
and det are military so that is going to work ok and not skew the results.
[Edited on 4-10-2016 by nux vomica]
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Zyxel
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Problem is that cone is not precision manufactured because man that made it for me dont have skill to made precise cone.
Which is best distance for non precise cone.
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nux vomica
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| Quote: Originally posted by Zyxel | Problem is that cone is not precision manufactured because man that made it for me dont have skill to made precise cone.
Which is best distance for non precise cone.
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3.5 to 4 cone dia is a safe bet .
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NeonPulse
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Nice looking cone but I would shorten the ring of unused material at the base of the cone to get more explosive in the tube if you fit it flush like
your picture. The excess copper will hinder the collapse of the cone lowering its performance.
You only need the detonator just into the plastique enough to ensure it will fire otherwise it looks like you will get a pretty good result. It will
be good to see the results.
You are lucky to have the right machinery or knowing someone who does 
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Zyxel
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I use ring of unused material at the base of the cone for easier centering the cone against wall of tube.Without it is more difficult to center cone.
Here are my baies form which I use explosive and detonator.
   
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Bert
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I am somewhat surprised at your source of raw materials.
And the open display of them in a public forum. I assume you were not just freely given those frags by your local army. Did they just "fall off a
truck"?
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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Zyxel
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Bro I live in shit hole state called Bosnia and Herzegovina, there was war 20 years ago.And here rules anarchy.You can buy any
weapons(explosvie,ak-47,rocket launcher,ATGM, MANPAD Strela 2M missile etc.) like you buy a patato in store.
I dont use weapons to harm peope I use it for experiments,its better that this handgranade is used in shaped charge project or to kill somebody.
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Fulmen
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I call that controlled destruction of military ordnance. He should be payed for his work.
We're not banging rocks together here. We know how to put a man back together.
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Bert
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After identifying those grenades as leftovers of or reproductions of the Yugo M-75, I understand that these DO fall off the truck, have been falling
off trucks for several decades, and are found throughout EU (and the rest of the world) wherever sketchy, violent and mercenary people are.-
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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Bert
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Република Српскa?
Rapopart’s Rules for critical commentary:
1. Attempt to re-express your target’s position so clearly, vividly and fairly that your target says: “Thanks, I wish I’d thought of putting it
that way.”
2. List any points of agreement (especially if they are not matters of general or widespread agreement).
3. Mention anything you have learned from your target.
4. Only then are you permitted to say so much as a word of rebuttal or criticism.
Anatol Rapoport was a Russian-born American mathematical psychologist (1911-2007).
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Zyxel
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No, Im in entity Federation.
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Zyxel
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Here are results. 39mm of penetration.Two scews that hold that together borke and bent, some holes also bent.Aluminium ring that hold detonator is
10mm thick but I find only 4 fragments from him.
Interesting is that on first plate is seen impact of cone copper ring that I use for easier centering of cone.His impact only leave light mark.But it
is not round it is deformed.The same problem as the previous cone, not consistent explosive desinty or not good centered/machined cone.But Im happy.
    
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NeonPulse
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Did another test yesterday again with pleasing results.
I had a tiny cone I had around and decided to set it into a copper pipe reducer fitting of 25 mm
The cone was epoxied in place about a week ago so it was well set.
The filling was a cast 2-5 PETN/ETN mixture developed Mr anonymous... this was achieved by melting 4g ETN in a small plastic medicine cup and
gradually introducing 10g PETN into it with stirring.
The charge casing was also warmed in the water bath and the liquid explosive was poured in.
The weight of cast filling was 12.7g. Standoff was 50mm 2x CD.
the target was a cylinder of 420 stainless steel and the charge penetrated nicely going into it 61mm deep with a 13mm entry hole.
Given the small amount of explosive and the small diameter of the cone I would call this a pretty good success.
    
[Edited on 9-10-2016 by NeonPulse]
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greenlight
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@NP, nice test!!
That is a decent result for the amount of explosive used and the size of the charge.
You should make a much larger version next time and go for a forum penetration record haha.
@zyxel, I still find it funny how most people on make their own explosive and dets but this guy takes apart frags to get his materials.
I can't figure out the huge entry holes on the first three plates. They are jagged and very big compared to the usual small mostly circular hole's
seen from conicals SC'S.
It is decent improvement over the first one though.
Maybe the cone deformed faster on one side than the other or something when forming the fluid-like jet or it could have something to do with the extra
copper on the base of the cone which you use to centre it in the casing?
Be good, otherwise be good at it
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NeonPulse
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It looks like the jet was skewed off and entering at an angle giving the odd shaped entry. The excess ring at the base of the cone probably caused
this. Off central initiation will cause it too.
And the record belongs to NUKE but his cone was so perfect it was suspected to have come from an anti tank round or similar. He used a whopping 1.5kg
of PETN and NG in combination so it is no wonder he holds the record. I have 110mm which is second or third place and I will be trying to beat that
since I still have these guys to use. I just need to go to the scrap yard and find a decent target and synth a bunch more PETN and EGDN to fill it
with.
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greenlight
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I think I saw his results on here before I joined and there was a dispute about whether it was wood or steel target material.
That is a huge charge weight though!!
Can't wait to see the results of the cones in the pictures you uploaded. What is the diameter of them? Its hard to judge with the tape in the photo
[Edited on 10-10-2016 by greenlight]
Be good, otherwise be good at it
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nux vomica
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Casting copper for cones.
Thought i would share a idea i had recently after seeing zyxel machined copper cones and not wanting to buy round stock to fabricate cones from
because of the cost of the material.
I decided that casting a rough form and machining that back would work ok as long as the copper was not full of porosity holes.
The copper is from old coins and i used the sand casting method and melted the copper in a graphite crucible in a pocket i cut in a soft fire brick
and a oxy torch to heat it up.
   
The copper casting machined ok and i have made 3 cones so far , i need to redesign the mold to cut down on the amount of copper per pour as well as i
need 56 grams to make a 6 gram 20mm diameter cone.
   
Now to test one out.
[Edited on 14-10-2016 by nux vomica]
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greenlight
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Nux, that looks fkin sweet, I've never thought of actually melt-casting liners at home haha. The final product came out beautiful especially for a
first design.
Whats the wall thickness on those cones?
Be good, otherwise be good at it
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nux vomica
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| Quote: Originally posted by greenlight | Nux, that looks fkin sweet, I've never thought of actually melt-casting liners at home haha. The final product came out beautiful especially for a
first design.
Whats the wall thickness on those cones? |
The one i am going to shoot is 1mm and the one in the pictures is around 0.8 mm.
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greenlight
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Interesting, I look forward to the results.
I am well overdue for testing as well. Last time I went out after spending a couple days crafting the 40mm EFP, the det failed and the explosive went
low order barely fragmenting the PVC casing.
Good luck
Be good, otherwise be good at it
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nux vomica
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Thnx Greenlight
I am also trying a new etn mix i noticed that the wax off miny babybell cheese whent quite soft from kneeding it in your hands so i made a 8% wax 92%
etn mix by melting the wax in a hot water bath and mixing in the etn it mankes a crumbly mix that compacts well.
   
I mistakenly deleted some of the assembly photos but this is the cone i am useing for the first test the inside has some marking on it from it
spinning on the arbor during machining ,the casting i used for this cone looked rough but it cut ok and has a good finish.
The i/d of the cone is 19mm and its 1mm thick.
  
I am trying a detonator that the petn is made from homemade pentaerythrol, ive had some tests and it seems to be as good as petn made from ebay
pentaaerythritol so this is the big test which is 110mm of steel.
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greenlight
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The wax from the outer coating of cheese, thats new.
The 8% inert shouldn't matter much at all, C4 has 9% and semtex has something like nearly 20% from memory.
Very interested to see how that cone goes, make sure to upload results.
Be good, otherwise be good at it
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nux vomica
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Haha even though the first steel block blew off when the welds holding it broke and dissipated the jet before the jet was finished doing its work, i
got 78mm penertration into the target (4.10 × cone diameter ) the entry hole is almost perfectly round so the cone collapsed equally and the bottom
30mm of the hole was plugged with copper.
The detonator had 1.2 grams of petn set off by lead azide, The main charge was 17.4 grams of etn wax , cone angle of 60° and dia of 19mm , wall
thickness of 1mm and standoff of 50mm ( 2.63 cone dia ). Cheers nux
  
[Edited on 14-10-2016 by nux vomica]
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