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Yet another coil gun prototype

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the_anomaly

Sun Dec 02 2018, 04:21PM

Registered Member #19 Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168

Ok DerAlbi send money - i will make a small model

This is a forum for sharing information. You can post a thread in the Sale and Trade forum if you wish to sell anything.

DerAlbi

Sun Dec 02 2018, 11:01PM

Registered Member #2906 Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727

in the presence of investments I will do everything

This is exactly my point. You will never get investors if everything you show is the capability of scaling without improving. You had capacitors, you had wires, you decided that the best you could do was scaling. If you could do more you would have done so. A good system is not about money, its about concepts. I ask you about conceptual improvements, but i never get an answer. It seems like you simply optimized an large scale SCR design and thats it.
Dont get me wrong: its an impressive gun with 600J kinetic, but from a technical standpoint it has been done - way bigger in some publications.

I could send you IGBTs (15x IXGK320N60A3 with their legs cut of, but you can solder wire onto them, they still work) and diodes (15x P600G) for free, if you like. I would even pay for shipping, i really understand your frustration, i have the same problem, but on a different level (my tools also were never good enough for the quality i wanted). But you would need to build the IGBT driver circuit on your own. Can you do this?

V2006

Mon Dec 03 2018, 01:24PM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
Location:
Posts: 86

I have two devices - a small one for 600 Joules kinetic (2000 Joules, 0.4 Farad, 100 Volts)
and a large at 1600 Joules kinetic (10300 Joules, 0.1 Farad, 450 Volts)

If I do not get investors, then this miserable planet will never make progress
if I tell you everything - everyone can do it - what will I get from this?
IGBT it's good
but we need modern capacitors

DerAlbi

Mon Dec 03 2018, 05:09PM

Registered Member #2906 Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727

Oh boy, you are a mess.

I really do get it, it depends really on luck where you are born and what access to education and society you have. Digikey parts are the same price for many regions, but income is not. For me, ordering part hurts a bit, but for others it is outright impossible to get industry quality supply. You seem like a very frustrated person blaming your problems on others and showing even jealousy which i understand, but i think that it is not a way forward.

In your videos, you are charging your capacitors with a light bulb. I can tell you outright, that it is impossible to bring the world forward with this level of technology; yet i understand that my critique is pointless because you simply cant do better with your resources. Still, any level of serious engineering is currently years away from you, even if you had resources - just to learn how to use the resources. [Doing simulation (circuit and FEM), make PCBs, programming, 3d printing, milling...]
I honestly dont see how you ever could get investors with your current mind set. You need more references for your engineering skills. Also you really should not write sentences like "but we need modern capacitors" because this implies that you think that your technological improvement might depend on other technological improvements that are not in your hands further saying that you havent actually done more than scaling.
The fact that you criticize important semiconductor effects as overhead to the topic speaks for it self.

The issue that repels me the most is currently the impression that you dont even know what you dont know and flourish in that ignorance. Without that knowledge you cant even appreciate or recognize or replicate engineering work leading to frustrated sentences like "i could do better than you with your resources" without knowing what you judge.

Your build with the 30% efficiency is impressive - no doubt! I analyzed your youtube audio and the claimed 50m/s is plausible.

But if the 30% efficiency would be the result of a ground breaking new optimization, scaling to 1.6kJ kinetic should not reduce efficiency to ~16%, if that optimization would be systematic and repeatable.
For me it looks like you just pushed more energy in the bigger gun, went deeper in saturation and got reduced efficiency. And the 30% efficiency with your dimensions is far from impossible, so i dont see any mechanics that are worth supporting right now.

Your projectile weighs 20x more than mine, and you push 30x more energy. So with the same iron you push 1.5x more energy than i do. That is not impossible in terms of scaling: the bigger you build a motor the easier it is to get better efficiency. Keep in mind that my goal was more complex than just energy transfer: i tried to reduce weight as well (and have a full functioning stand alone system with high shot rate)

I am really open for you because i see that you have enough passion to be frustrated. But in your position your only chance is to be open about your achievements and be honest and detailed. Keeping this technology to your self is not a way forward to be recognized. First we need to discuss if your gun is really the result of some good idea or if it is just up-scaling.
If i really missed something and you keep everything to your self and die with your secrets, then the world indeed will not go forward. On the other hand, if you are open and we find that everything you think is special about your gun can be explained by already known effects, then maybe that will lower your frustration too. Your mind set - being a frustrated, unrecognized talent - is damaging in the long run.

@mods: i know that currently the forum software is currently a bit kaputt. We are hijacking Zuckerstanges thread, but V2006 is something that deserves attention. Sorry if you grind your teeth if the admin tools are not functioning right now, but i hope you can cut out out posts later on. Damage is already done, so we might as well continue here.
@ Zuckerstange: sry auch an dich ^_^

V2006

Mon Dec 03 2018, 08:28PM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
Location:
Posts: 86

I had no money for batteries

even on this miserable planet is full of ways to charge capacitors

100 volts proved to be more efficient than 450 volts

I spent almost three years in prison
when I came out I saw that nobody did anything
and none of you will do anything
the inhabitants of the earth have deceived themselves "Doing simulation (circuit and FEM), make PCBs, programming, 3d printing, milling...]"

if it interferes Zuckerstange - write to my thread
or e-mail **link**

DerAlbi

Mon Dec 03 2018, 10:57PM

Registered Member #2906 Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727

Thanks, you made a pretty clear picture now.
I am sorry to say that i dont see that you have a working theory about coilguns. Lowering the voltage to get better results is a tuning step, but from a system view always wrong. If you need to lower the voltage you have too much capacitance and too thick wire in your coil.. Your goal should always be to minimize current, because that is what causes heat. And maybe you wouldnt need better capacitors, because losses in ESR matter less...
Maybe you deceived yourself getting away without theory and simulation

Just out of curiosity: what do you expect from others? What is the progress you demand??

V2006

Tue Dec 04 2018, 09:32AM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
Location:
Posts: 86

I have working theory about coils
I have everything except money and happiness))
I do from what is available
There were 450 volt capacitors
And there were 100 volt capacitors
I just have no other capacitors
Previously tried 900 volts and even 1350 volts - meaningless
And my coils do not heat at all
In one Israeli university undertook to calculate my parameters - they didn't succeed
completely different results were obtained
apparently, without receiving my layouts, no one will understand anything
I don't speak English well
progress is 200 meters per second and above

DerAlbi

Tue Dec 04 2018, 10:15AM

Registered Member #2906 Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727

Make a detailed drawing (dimensions of your coils, coil distance and so on, also the projectile..) also prepare capacitor values , turn count, DC resistance, wire diameter and switching points (positions or timings). I will conctact you via email and invest the time for a simulation. I can also have a look on what you think is special. If you dont trust me, then dont. But nothing will come from nothing. If its just an upscaled SCR design, it should be manageable. I had good experiences with simulation.

V2006

Tue Dec 04 2018, 10:48AM

Registered Member #61550 Joined: Thu Apr 06 2017, 03:23PM
Location:
Posts: 86

Ok. Write to my e-mail

Zuckerstange47

Wed Dec 12 2018, 03:31AM

Registered Member #61926 Joined: Wed Nov 22 2017, 04:08PM
Location:
Posts: 34

I was reloading the thread for days, without noticing that the conversation moved to another thread

Instead I will continue updating my stuff: Yesterday I got PCBs from China to build light barriers. They probably are not perfect, but I like the result. The barriers are meant to be clamped on two threaded rods so that they cannot move when accelerating a mass, yet it should be possible to reposition them easily.
I bought them from the manufacturer shown on the parcel in the image.

Even though most of you might know about buying PCBs, the process was new for me, and maybe it could be interesting for others, too, so I will give a short summary: I learned about the shop from numerous youtube-tutorials on the topic, it seems to be the cheapest source for getting such products. The designing process can be done directly in the browser window ("EasyEDA.com") and the basic knowledge about using the software can be aquired in about 1-3 hours.
I bought 10 PCBs (the minimum quantity, I guess) in the cheapest finish (2 conducting layers [even though I only used one], 10x10cm) with four light barrier boards on each PCB, so I got 40 all in all (probably too much actually). The costs are 2$ + shipment and paypal currency exchance charge, which resulted in about 9,50 Euro for me (0,24 â‚¬ per light barrier board). This way it was much easier to make multiple light barriers, with a much nicer looking result, compared to the ones I made using perfboards.

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