newtoolsmith

Hi friends,

look what was written to me relating to the topic "help me in making gunpowder" :

>Looking to the right top corner of this site will show you a button called "search".
m sorry m new so I didnt know much



>Many member use it and thats what you should do.
OK I'll use it



>What do you mean with gunpowder? Corned BP or nitrocellulose?
I mean black powder



>Are you sure that hammering BP is wise? I am not.
I know its not wise but its fine according to me. I used to do this when my ball mill was not working.


>What has dexrein to do in BP?
for ur kind information sometimes professionals use dextrin(dampened with a lot a lot a lot of water for the diappering method) in bp. Though I am not a professional.



>Without ball mill? Search for CIA method.
thanks I'll do that



>Without weighing the chemicals? I would not even think of...
sometimes we have to mix them by estimate when we dont have a scale. I have a very accurate one but my cousine dosnt have any. Any way experts can even make it by estimate though its not so powerful.



>Why doesnt your mill work?
Mind ur own business. My eye!... Why do u want to know this. It stopped working when I kicked it very hard in anger.



>You should read a lot here before going on. As I said somewhere else: we dont want to loose our members.

I agree that we dont want to loose members but I already know a lot so I dont need to read much.



>MfG
>newtoolsmith

this time its me who is answering
The Pyromaniac

Hello Pyromaniac,

sorry but you are wrong. You have to read a lot!

Guinpowder and BP are two different things - so why do you say gunpowder while you mean BP?

Hamering BP is not fine, not for you nor for anyone else. Dont do something like this and dont say its good. There might be someone who tries and dies. It would be your fault.

Dextrin is a binder used fpr stars and so on. In real BP its useless. For lift or similar uses BP is pressed and corned withour dextrin.

If you dont weigh your ingredients, you wont get reliable results. Here again is a great danger of heavy accidents.

Do you think, people who kick their mill when they are angry shoulb handle pyro mixtures? Does anyone else think so?


Im sorry but this has to be published!! I think I have to save you and others.

Pyrotechnics are a very great hobby - but do it correctly and safe please.




MfG
newtoolsmith

Hi friends,

sitting here and reading a lot stuff about rocket motors, I noticed the many times there were questions about the use of ammoniumnitrate as an oxidizer in rocket fuels.

The biggest disadvantage seems to be the hygroscopicity.

Cant this problem be solved by using paraffin as the fuel?

I think it should be possible to mill the nitrate down to dust and add a slight excess of molten paraffin. Just enough to ensure that all nitrate particles are fully covered by the fuel.

The high ignition temperature is a further disadvantage but I think we can even let this work for us...

Now we have to ask: are there advantages?

Yes, there are some.

Ammonium nitrate is very easy available even in tons because it is a common used fertilizer.

Ammonium nitrate is very cheap, mmuch less expensive than KNO3.

The mixture would be easier to produce than BP and it should be possible to press or ram it into motor casings very similar to BP.


Did anyone try this?

Does anyone agree or disagree?

Any errors in reasoning?


MfG
newtoolsmith

Hi friends,

I decided to start this topic because I noticed some problems designing a high current power supply.

For electrolysis we need a high amperage but low voltage. If no special transformer is available, you can add new secondary windings to a microwave oven transformer (MOT).

I did this and wound two parallel secondary windings onto the MOT core. The wires are 16mm? PVC insulated copper cables. The addition gives 32mm? - enough aerea for 200A. The windings consist of five turns only and give 4,3VAC each.

The main problem is the rectifier. Across a diode you will measure aproximately 0,7V. Each bridge rectifier has two diodes in the current path so you will have a voltage drop of 1,4V over the bridge.

If you carry a current of 200A over the bridge rectifier there will be 1,4V*200A=280W lost power!

The second disadvantage is that 4,3VAC will give 6VDC when rectified and smoothed down with capacitors.

THIS IS WRONG!!

There are 1,4V to be substracted and 4,6V will be the resulting voltage we can use. Theese 4,6V @ 200A give a power of 920W.

When comparising the uesd and the lost power, we get a efficiency of approx 75% ( 920W/(920W+280W)=76,6% ). The transformer itself does his very best to dissipate some power too.

I found that 4,6V is quite low - my actual experimental cell runs at 4,9V and I would like the voltage to be a bit higher.

SECOND WAY:

I think I will use windings in series and reach 8,6VAC@100A. After rectifying and smoothing I will have 12,2VAC with 1,4V loss. This gives 10,8V.

The next step is to run two cells in series. Each cell will then be operated at 5,4V. This is what I wanted because you need this value of voltage to prepare perchlorates.

The rectifying efficiency increases to about 88%.

Another advantage is the lower current. This gives the possibility to use standard rectifiers.



There is one problem left: I dont understand the sign on top of the MOT.



First the MOT is called to be a 500W transformer, then the primary power consumption is said to be 990VA and last but not least the secondary Power output is said to be 1773 VA. The heat winding for the magnetron is not interesting since it delivers under 40VA.

That is impossible but I think the 1773VA are realistic (it was a 700W microwave oven and the efficiency of a microwave oven is too low to be worth any discussion).

Any ideas?

MfG
newtoolsmith

Hi friends,

as I promised, pictures of my visco machine will follow.

Before I have to solve a little problem:

The NC-laquer I use for my visco is very brittle when dried. The laquer breaks if the visco is bent.

How much camphor should I add to plastifise it like it is done to make cellophan?

I think, dissolving camphor in a small amount of aceton and put this into the NC-laquer folowed by stirring should give the wanted efect.

But how much camphor to use?

Has anybody done this before?

MfG
newtoolsmith

Hi friends,

I had the chance to buy PVC powder but I had to take 25kg of it. The cost was 100 Euro.

This large amount is much more than I need, so I will sell the excess.

You can buy a kilo for 4 Euro and have to pay the shipping. I just want the huge bag to disappear, not to earn money.

At skylighter it is more than four times expensive!! They take almost 8$ for a pound.

Postage in Germany is no problem, I dont know anything about shipping in europe or worldwide, probably anyone can tell something about.


Use Email to contact me if you want some.



MfG
newtoolsmith