635 replies to this topic

[mike_au]

nice mill, but i think you'll experience slippage with a loaded jar, i find you need two powered rollers, nothing more than another shaft parallel to the first,the jar sitting inbetween driven by connecting a rubber hover belt between the two shafts, just see how it goes

My old mill used one powered roller and a couple of castor wheels, I didn't notice any slipping at all. I have now started work on a new one which replaces the wheels with another roller and it is slipping *A LOT*. My theory is that the castors are smoother and that the slight height difference between where the wheels sit on the jar VS where the roller sits makes it easier for the roller to pull the jar around.

[leosedf]

http://www.pyrobin.c...es/dsc02026.jpg
http://www.pyrobin.c...es/dsc02029.jpg
http://www.pyrobin.c.../ball mill2.wmv
Progress from my new mill, still needs work and painting but it will be a large one.
Almond treating machine converted to a ball mill.

Will need 1 or 2 weeks to finish it.

[xXPyroJoeXx]

Saw that on PyroBin yesterday XD Nice one, looks good, also the fact that the rollers are long....you can mill 2 jars at once! Nice one (Y)

[dr thrust]

My old mill used one powered roller and a couple of castor wheels, I didn't notice any slipping at all. I have now started work on a new one which replaces the wheels with another roller and it is slipping *A LOT*. My theory is that the castors are smoother and that the slight height difference between where the wheels sit on the jar VS where the roller sits makes it easier for the roller to pull the jar around.

hmm ok, the secret is to power up the second roller,the advantage of two long rollers being that you can run multiple milling jars saving time and electric!

[mike_au]

leosedf: that looks really good!

are the outer rollers powered? I can see that they are connected to each other, but it looks like only the middle roller is connected to the motor. What is the benefit of joining the outer rollers?

EDIT:
chris m: I'm in the process of doing exactly that. I picked up some pulleys the other day, I've got the engineers at work boring them out and adding grub screws for me. Hopefully I will be able to put it together tonight.

Edited by mike_au, 27 October 2008 - 11:56 PM.

[leosedf]

All of the rollers are powered with allmost the same force from the motor. What i think is the benefit is that you can have very heavy jars turning normally. Nothing can stop it.
Remember it's not ready yet, i need to paint, attach some protection bars of small wheels and maybe some safety protections (motor overheat).
Actually it has 3 rollers. One shared roller and two seperate. That means 2 large jars and two small ones.

Edited by leosedf, 28 October 2008 - 11:33 AM.

[dr thrust]

just watched your video, its certainly a large mill!, looks a bit "rustic "to , thought of..maybe investing in some new bearing blocks? for those 24hour bp milling sessions

[Mortartube]

Does anyone on here specifically use a rock tumbler for ball milling as opposed to a dedicated ball mill?

If so, how long does it take you to get a good fast BP?

What type and size of media do you use and what loading volumes for media/powder and empty space?

What is your mill jar RPM etc?

Edited by Mortartube, 31 October 2008 - 11:11 AM.

[dr thrust]

yes i do have a small evans tumbler,with 12mm brass bar as media,i think lead would be to heavy,in a 100mm diameter, 100mm long jar half filled .about 450g media, 100g bp
to get good fast bp just let it run all night,after all these machines are designed to run for days, weeks even.
i bought it one just to get started but then built one for larger batches, multiple batches to save on time.
ill link my old video of the two against each other most people have seen it before tumbler v ball mill

Edited by chris m, 31 October 2008 - 06:06 PM.

[spanner]

Nice. You gotta like those pulleys- talk about adjustability!

[Pyrogeorge]

Does anyone on here specifically use a rock tumbler for ball milling as opposed to a dedicated ball mill?

If so, how long does it take you to get a good fast BP?

What type and size of media do you use and what loading volumes for media/powder and empty space?

What is your mill jar RPM etc?

I used rock tumbler but now i make ball mill for making much more BP.

i used lead media (0,75 inch) and rpm was about 63.

1.30 hour milling and the result.

[Mortartube]

How big was your mill jar? How full of media, how much powder and how much did you leave empty?

[Pyrogeorge]

i don't remember the exactly size of jar but it is like in photo above.

As far the media the standar capacity it must be..

The half with media (1/2) and the other half of half with powder (1/4)



Because i didn't have much media i fill it with less powder

sorry for my bad english

Edited by pipipi, 02 November 2008 - 05:02 PM.

[Mortartube]

Thank you for the information. I think it will be most helpful.

Your powder is very fast for one and a half hours milling.

Edited by Mortartube, 02 November 2008 - 05:35 PM.

[spanner]

Very fast BP for a short mill time, you must have had fine, dry chemicals to start out with.

63 RPM is kind of slow for a 4" jar, and 3/4" media a bit large- but if it works...

Have you noticed any erosion of the media?