about ball mill

[Frozentech]

Bismuth/Tin alloy. No sparking problem that I know of ?

[Arthur]

The lead used in the building trade for roof flashings IS lead and can be melted in a small tin over a "blowlamp" or gas torch.

 

Fishnig stores in th UK sell moulds for casting your own weights and there are moulds for spherical weights of several sizes.

 

Typically a big barrel 200+mmDIA would run at 50 RPM and a 100mm DIA or less drum at 100RPM and speeds between for sizes between.

 

A typical ball would be 10% of the drum bore maximum.

[pudidotdk]

I don't get why people are so obsessed with getting round lead balls, why not just cast them in a copper pipe and cut cylinders?

[Bonny]

I don't get why people are so obsessed with getting round lead balls, why not just cast them in a copper pipe and cut cylinders?

My media is brass, and I only have 2 balls ...pun not intended. The rest of my media is a mix of cylindrical, flat, and oddball shapes chopped from large bushings on an ironworker.

[FrankRizzo]

I don't get why people are so obsessed with getting round lead balls, why not just cast them in a copper pipe and cut cylinders?

I've never gotten that too work on a decent scale. Of 12 pipes that I poured lead into, only 5 actually released the cast rod. Cutting the pipe along with the lead inside is too expensive. I much prefer the drilled 2x4 method...and you can always use the wood for charcoal afterward.

[Arthur]

I read the "cut cylinders" as cut cylinders into smaller lengths. I have neard of people using lead filled copper surfaced media - lead cast into copper pipe and left there.

 

I cast some lead cylinders into 3/4 paper pyro tubes then cut the card off with a knife.

[lnstantkarma]

Hi

 

I go fishing, and here, like in denmark, it is not pure lead anymore,

if i remember correct, they alloy lead with zinc I think.

But that does not spark and should be fine for a ball mill.

 

If you are not sure enough to use it in a ball mill, check ebay or your

local hunting store for musket balls.

 

 

PS: Has anyone created his ball mill the design united nuclear uses?

Isn´t the jar directly connected with the motor?

 

Stinger

I have the same type of mill they sell and no it's belt driven

[pudidotdk]

Actually I meant casting the lead in the copper pipes and taking out the cylinder of lead and then cut into suitable media.

I have some lead lying, I'll try and see how hard/easy it is to do.

[Bonny]

Actually I meant casting the lead in the copper pipes and taking out the cylinder of lead and then cut into suitable media.

I have some lead lying, I'll try and see how hard/easy it is to do.

When I used lead I did as FrankRizzo said, simply pouring the lead into holes drilled into wood. If you are casting into pipe, freezing the pcs after MIGHT help in removal as the metal should contract,making the lead easier to remove.

[Stinger]

Hi

 

I finished my ball mill today, I need to say:

 

It is really, really nice!

 

Here is a picture:

 

http://img516.imageshack.us/my.php?image=s8000024rh7.jpg

 

 

Stinger

[Sylar]

Looks aren't as important as functionality.

Does it work when loaded with media and product/composition?

 

It doens't look like you can transfer alot of energy to the container because of the small contact area between the roller and the milling jar.

You don't even have a friction enhancer of any sort ...

[pyrogeorge]

I bought lead balls from fishing store,it is about 23mm,how many balls needed to make fine powder?

[FrankRizzo]

pipipi,

 

We need to know the diameter of your milling jar (inner and outer) as well as the volume. A normal jar of 6" inner diameter 10" long will use ~28-30lbs of .5" lead balls (~1200) to fill it to the optimum level.

[pyrogeorge]

Can i use glass jar in ball mill instead of plastic jar?

[Mumbles]

Absolutly not.

 

Also, with lead balls that big you will need a very big jar for them to be as efficient as they can be. About 10"(25cm) ID for them to be optimal. I'd have my doubts if they would even function in jars much smaller than 6"(15cm) ID.

 

 

 

Now, you really need to do more reading on your own. We're here to help, not give you all the answers. I am personally starting to get pissed off from your lack of searching.

[pyrogeorge]

pipipi,

 

We need to know the diameter of your milling jar (inner and outer) as well as the volume. A normal jar of 6" inner diameter 10" long will use ~28-30lbs of .5" lead balls (~1200) to fill it to the optimum level.

i have dual drum rotary tumbler (6lb).it has got two separate barrels 3lb capacity each barrel..and the barrel size is 4-3/4"H x 4-1/2"OD

[FrankRizzo]

pipipi,

 

We need to know the diameter of your milling jar (inner and outer) as well as the volume.  A normal jar of 6" inner diameter 10" long will use ~28-30lbs of .5" lead balls (~1200) to fill it to the optimum level.

i have dual drum rotary tumbler (6lb).it has got two separate barrels 3lb capacity each barrel..and the barrel size is 4-3/4"H x 4-1/2"OD

Assuming the inner diameter is ~4", your optimal speed is 100 RPM. As long as the motor is at least 1/4 HP (most tumblers are 1/10HP), you can probably replace the pulleys on both the motor shaft and rollers to bring it up to speed. My Lortone tumbler (QT6) turned ~38RPM out of the box.

 

Also, Mumbles is correct. Your 23mm media are *way* too big for a jar that size. With 1/2" media, the optimal RPM is a bit slower (~93RPM).

[pyrogeorge]

the rock tumbler is temporary,i will make a ball mill with good motor..so i need media about 15mm diameter?

[Swede]

Pipipipipi, do some experimentation. I've got that exact rock tumbler. It works fine, makes good BP. A substandard ball mill, a jar not charged perfectly, media a bit off, is not going to prevent the BP from working. Often you can make up for less effective ball milling by simply letting it run a lot longer.

 

For what it's worth, I used 1/2" or 12mm round lead balls. Fill the jar 1/2 ful of them. Add chemicals. Mill. Wait many hours, then check the product.

[Mumbles]

The size of the media is primarily determined by the size of your jar. The diameter should be approximatly 1/10 the ID of your jar. So for a 4" ID jar, around .4" is ideal, but .5" works just fine.

[pyrogeorge]

thanks for your replys,i will make my experiments!

[Dennisdenny]

Does somebody know a place or site in the netherlands where i can buy a ball mill and media?

[Col]

I went for small media (12mm) with my 200mm jars as it creates smaller voids and more surfaces in contact for grinding. Larger media would make emptying the jars a lot easier though Edited November 14, 2010 by Col