Thumler's Brand Tumbler as a Ball Mill?

[l***@gmail.com]

Has anyone used one of these or does anyone have any comments about
their efficacy as a ball mill? Wazs thinking about the large "Model B
- 15 lb Capacity" one with the hexagonal barrel at the bottom.

http://www.therockshed.com/tumbler2.html

I'll be doing relatively small batches but I've stumbled upon one at a
pretty good price.

[Däve]

Post by l***@gmail.com
Has anyone used one of these or does anyone have any comments about
their efficacy as a ball mill? Wazs thinking about the large "Model B
- 15 lb Capacity" one with the hexagonal barrel at the bottom.
http://www.therockshed.com/tumbler2.html
I'll be doing relatively small batches but I've stumbled upon one at a
pretty good price.

I use the 15lb barrel for my ball mill. I'm very happy with it. The rubber
lining is nice and quiet.
My lid has been modified.
Loading Image...
It's good for 3-5lb batches max.
I can't offer any information about the Thumler's motor/drive mech, as I
don't use it.

[LBussy]

Post by Däve
I use the 15lb barrel for my ball mill. I'm very happy with it. The rubber
lining is nice and quiet.
My lid has been modified.http://pyrotechnics.no-ip.org/files/dsc05445.jpg
It's good for 3-5lb batches max.
I can't offer any information about the Thumler's motor/drive mech, as I
don't use it.

Very nice looking frame!

So the lining ... how does that work with chemicals? I'd think they
would get behind the rubber and just sorta sit there and not get
milled?

[Däve]

Post by Däve
I use the 15lb barrel for my ball mill. I'm very happy with it. The rubber
lining is nice and quiet.
My lid has been modified.http://pyrotechnics.no-ip.org/files/dsc05445.jpg
It's good for 3-5lb batches max.
I can't offer any information about the Thumler's motor/drive mech, as I
don't use it.
Very nice looking frame!
So the lining ... how does that work with chemicals? I'd think they
would get behind the rubber and just sorta sit there and not get
milled?

The lining is a complete one-piece insert. The bottom, sides and outer lip
are all one piece.
There is another solid gasket for the lid. There is no way behind it.

[LBussy]

The lining is a complete one-piece insert.  The bottom, sides and outer lip
are all one piece.
There is another solid gasket for the lid.  There is no way behind it.

Ah that makes sense now! If I had seen one up close I guess that
would have been more apparent.

Thanks for the replies.

[Putt]

Post by LBussy

The lining is a complete one-piece insert.  The bottom, sides and outer

lip

are all one piece.
There is another solid gasket for the lid.  There is no way behind it.

Ah that makes sense now! If I had seen one up close I guess that
would have been more apparent.
Thanks for the replies.

I picked up an old Loritone base on e-bay for a few bucks, (old as in
bushing instead of roller/ball bearings on the shafts). No motor, but
a 15 lb barrel and lid.. Picked up a half horse motor, went a little
bigger on the motor pulley to speed it up a bit, then wrapped the
drive shafts with some electrical tape to speed it up even more
(close to 60 rpm). The drum has internal "flats" to help with
lifting the media/composition, but I hot glued a couple sticks
of teflon rod (each rod is 1/2 the length of the drum, hot glued
180 degrees from each other to lift and mix the comp) which made
a fair amount of difference in the amount of time necessary to
make up a batch of whatever.. I can use granular nitrate, un-pulverized
charcoal and garden sulphur and get some pretty hot BP in just about
2 hours... I also have a half drum that I purchased for "small" batches
that also works very well, (without the lift bars) but is quite a bit
slower than the larger drum.. Oh, media is 1/2 copper pipe filled with
lead cut into 1/2 to 1 1/2 inch lengths I only use maybe 2 or 3 lbs of
media while tumbling.... (2 or 3 Kg batches of comp.)


Putt...

[LBussy]

I've somewhat gone away from searching for a suitable lapidary tumbler
since asking these questions. By the time I go to all the trouble to
make one "work" I could have built one ala Sponenburgh. So, that's
teh direction I'm headed I guess.

I appreciate the replies though. Made me more sure that making a mill
was the way I wanted to go.

[John Reilly]

Post by LBussy
I've somewhat gone away from searching for a suitable lapidary tumbler
since asking these questions.  By the time I go to all the trouble to
make one "work" I could have built one ala Sponenburgh.  So, that's
teh direction I'm headed I guess.
I appreciate the replies though.  Made me more sure that making a mill
was the way I wanted to go.

It's really the ONLY way to go if you want to make high quality
gunpowder in any quantity and without having to mill it forever. If
folks would just buy Sponenburgh's book they'd save themselves a great
deal of time and effort. The Thumler's "15 pound" hex drum mill will
scarcely turn when properly charged with 30 pounds of lead media (half
full) and 2-1/2 to 3 pounds of BP ingredients. I guess if you fill it
half full of ceramic media, it would have a higher rpm. but nowhere
near 65 rpm which the "Sponenmill" handles easily with 2 drums (60
pounds) of lead media.

John

[LBussy]

Post by John Reilly
It's really the ONLY way to go if you want to make high quality
gunpowder in any quantity and without having to mill it forever.  If
folks would just buy Sponenburgh's book they'd save themselves a great
deal of time and effort.

Actually I found his book scanned online ... having published a couple
of similar texts (about a different subject) I know nobody is getting
rich off the effort so I am ordering the book today. It's worth it to
have good-quality pictures of the effort.

... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

-Lee

[Lloyd E. Sponenburgh]

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that. Will you contact me by private email to tell me the
web site where it's available.

I know of two persons who have either stolen the text, or plagiarized
me. One is in Sweden, one a well-known hobby ball mill supplier.

LLoyd

[LBussy]

On Oct 23, 10:13 am, "Lloyd E. Sponenburgh"

Post by Lloyd E. Sponenburgh
Thanks for that. Will you contact me by private email to tell me the
web site where it's available.

Done, you've got mail.

[LBussy]

Post by LBussy
Done, you've got mail.

Actually ... it bounced. I think you will be able to respond directly
to me however and then I'll reply with the info you wanted.

[Lloyd E. Sponenburgh]

Post by LBussy
On Oct 23, 10:13 am, "Lloyd E. Sponenburgh"

Post by Lloyd E. Sponenburgh
Thanks for that. Will you contact me by private email to tell me the
web site where it's available.

Done, you've got mail.

Take out the "inside" inside my address.

LLoyd

[LBussy]

On Oct 23, 2:44 pm, "Lloyd E. Sponenburgh"

Post by Lloyd E. Sponenburgh
Take out the "inside" inside my address.

I'm an idiot and you;ve got mail (theoretically).

-Lee

[Richard J Kinch]

Post by Lloyd E. Sponenburgh
Will you contact me by private email to tell me the
web site where it's available.

If it makes (made) it to alt.binaries.e-book.*, you'll never get it back.

[Däve]

Post by Richard J Kinch

Post by Lloyd E. Sponenburgh
Will you contact me by private email to tell me the
web site where it's available.

If it makes (made) it to alt.binaries.e-book.*, you'll never get it back.

It doesn't appear to have made it there. I've frequently monitored that
group for a couple of years now.

[k***@yahoo.com]

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that. Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me. One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

Demonoid has hosted several torrents that the ball mill text is in.
Here's one, along with a bunch of other books about pyro-related
subjects. I don't know if any more of them are still protected. This
particular torrent has been active for over a year now...
http://www.demonoid.com/files/details/1378885/?show_files=#comments

[TONY S]

Post by k***@yahoo.com
On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

Demonoid has hosted several torrents that the ball mill text is in.
Here's one, along with a bunch of other books about pyro-related
subjects. I don't know if any more of them are still protected. This
particular torrent has been active for over a year now...http://www.demonoid.com/files/details/1378885/?show_files=#comments

I cant open any of them ,Yes I;m a member...... my new computer won't
open any of the books I've downloaded and I've tried every app I
have...

[jasper]

Post by TONY S

Post by k***@yahoo.com
On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

Demonoid has hosted several torrents that the ball mill text is in.
Here's one, along with a bunch of other books about pyro-related
subjects. I don't know if any more of them are still protected. This
particular torrent has been active for over a year now...http://www.demonoid.com/files/details/1378885/?show_files=#comments

I cant open any of them ,Yes I;m a member...... my new computer won't
open any of the books I've downloaded and I've tried every app I
have...- Hide quoted text -
- Show quoted text -

Try right-clicking on it, then click "Open Containing Folder". It
should then display all of the texts. They're in PDF...

[TONY S]

Post by jasper

Post by TONY S

Post by k***@yahoo.com
On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

Demonoid has hosted several torrents that the ball mill text is in.
Here's one, along with a bunch of other books about pyro-related
subjects. I don't know if any more of them are still protected. This
particular torrent has been active for over a year now...http://www.demonoid.com/files/details/1378885/?show_files=#comments

I cant open any of them ,Yes I;m a member...... my new computer won't
open any of the books I've downloaded and I've tried every app I
have...- Hide quoted text -
- Show quoted text -

Try right-clicking on it, then click "Open Containing Folder". It
should then display all of the texts. They're in PDF...

OK I'll try ,,we just rebooted our computer and added a 500g hard
drive so all the settings reverted to normal it goes to adobe 9.0
automatically

[TONY S]

Post by TONY S

Post by jasper

Post by TONY S

Post by k***@yahoo.com
On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

Demonoid has hosted several torrents that the ball mill text is in.
Here's one, along with a bunch of other books about pyro-related
subjects. I don't know if any more of them are still protected. This
particular torrent has been active for over a year now...http://www.demonoid.com/files/details/1378885/?show_files=#comments

I cant open any of them ,Yes I;m a member...... my new computer won't
open any of the books I've downloaded and I've tried every app I
have...- Hide quoted text -
- Show quoted text -

Try right-clicking on it, then click "Open Containing Folder". It
should then display all of the texts. They're in PDF...

OK I'll try ,,we just rebooted our computer and added a 500g hard
drive so all the settings reverted to normal it goes to adobe 9.0
automatically

it only opens a page of jibberish no text,same thing all the time,only
37kbs too! not the 638 that its says for the ten books or 1.8gigs for
the 638 books that one only gets me 17 kbs of nonsense

[TONY S]

Post by TONY S

Post by jasper

Post by TONY S

Post by k***@yahoo.com
On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

Demonoid has hosted several torrents that the ball mill text is in.
Here's one, along with a bunch of other books about pyro-related
subjects. I don't know if any more of them are still protected. This
particular torrent has been active for over a year now...http://www.demonoid.com/files/details/1378885/?show_files=#comments

I cant open any of them ,Yes I;m a member...... my new computer won't
open any of the books I've downloaded and I've tried every app I
have...- Hide quoted text -
- Show quoted text -

Try right-clicking on it, then click "Open Containing Folder". It
should then display all of the texts. They're in PDF...

OK I'll try ,,we just rebooted our computer and added a 500g hard
drive so all the settings reverted to normal it goes to adobe 9.0
automatically

if you can help me offsite please do so

[Lloyd E. Sponenburgh]

TONY S <***@gmail.com> fired this volley in
news:4537a86e-a65a-434e-be05-

Post by TONY S
if you can help me offsite please do so

Yes, Tony, I'll help you. If you successfully open my book's copy,
and are able to use it, I'll help you to a healthy lawsuit.

Will that help?

<<G>>

LLoyd

[Don T]

Post by Lloyd E. Sponenburgh
news:4537a86e-a65a-434e-be05-

Post by TONY S
if you can help me offsite please do so

Yes, Tony, I'll help you. If you successfully open my book's copy,
and are able to use it, I'll help you to a healthy lawsuit.
Will that help?
<<G>>
LLoyd

Not a lot. Prolly hurt some. Hope you are having your legal team get the
skinny on that link and the owner.

For TONY S., theft is theft and there is a category of crime called
"recieving stolen property" that fits here. You KNOW that Lloyd's book is
copyright protected so, prima facie, you know that an internet file of his
book has been stolen from the rightfull owner. Your post telling the world
and the FBI that you have Lloyd's book as a file on your computer is all
that is necessary for a succesfull prosecution on the "recieving stolen
property" charge.
--
Don Thompson

Stolen from Dan: "Just thinking, besides, I watched 2 dogs mating once,
and that makes me an expert. "

There is nothing more frightening than active ignorance.
~Goethe

It is a worthy thing to fight for one's freedom;
it is another sight finer to fight for another man's.
~Mark Twain

[TONY S]

On Nov 9, 8:17 pm, "Lloyd E. Sponenburgh"

Post by Lloyd E. Sponenburgh
news:4537a86e-a65a-434e-be05-

Post by TONY S
if you can help me offsite please do so

Yes, Tony, I'll help you.  If you successfully open my book's copy,
and are able to use it, I'll help you to a healthy lawsuit.
Will that help?
<<G>>
LLoyd

oh well I was never able to get the books from demonoid any way,the
file must be corupted or something, I did get a trojan horse
though,THank God my antivirus caught it though,I removed demonoid from
my bookmarks ,and WON'T be going back,And what the heck are you
talking about, anyways? I never mentioned any of your books,all I ever
wanted was that list from Demonoid,the one you mentioned in the first
place!!!!!!!!!!!!!!!!!!!!!!!!!!!!! you must've been reading between
someone else lines!!!!!!!!!!!!!

[TONY S]

Post by TONY S

Post by TONY S

Post by jasper

Post by TONY S

Post by k***@yahoo.com
On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

On 23 Oct, 10:13, "Lloyd E. Sponenburgh" <lloydspinsidemindspring.com>

Post by LBussy
... and before anyone asks, no I will not send you the scanned copy.
I see Mr Sponenburgh is a frequent contributor here and if he wanted
to make it so available he would.

Thanks for that.  Will you contact me by private email to tell me the
web site where it's available.
I know of two persons who have either stolen the text, or plagiarized
me.  One is in Sweden, one a well-known hobby ball mill supplier.
LLoyd

Demonoid has hosted several torrents that the ball mill text is in.
Here's one, along with a bunch of other books about pyro-related
subjects. I don't know if any more of them are still protected. This
particular torrent has been active for over a year now...http://www.demonoid.com/files/details/1378885/?show_files=#comments

I cant open any of them ,Yes I;m a member...... my new computer won't
open any of the books I've downloaded and I've tried every app I
have...- Hide quoted text -
- Show quoted text -

Try right-clicking on it, then click "Open Containing Folder". It
should then display all of the texts. They're in PDF...

OK I'll try ,,we just rebooted our computer and added a 500g hard
drive so all the settings reverted to normal it goes to adobe 9.0
automatically

if you can help me offsite please do so

Hey I never infringed any copyright laws,Lloyds book is not on our
disk ,only open files that are already on the internet...

[LBussy]

Post by TONY S
Hey I never infringed any copyright laws,Lloyds book is not on our
disk ,only open files that are already on the internet...

Tony, legal advice is best handled by lawyers, but I assure you that
accessing a bootlegged file that you know is copyrighted is a
violation of the copyright. It also most assuredly makes a copy on
your hard drive. Believe me, I am more than a little experienced in
computer forensics and have testified in court in similar issues.
Even when you "clear your cache" evidence remains.

I found the same files on the Internet but I found a real value in
them so I went and purchased the book. If you can't afford to do so
then you won't be able to afford to make a ball mill and you should
probably avoid the hobby all together. On top of all that, Lloyd is a
contributor here and does so for free and because he truly enjoys the
science. To continue to reference his book without the courtesy of
recognizing his ownership is flat out rude. Maybe that doesn't bother
you or others but it does bother me so that's how *I* chose to act. I
respect anyone's right to disagree with me of course.

Flame away, /dev/null awaits.

Cordially,

-Lee

[LadyKate]

Post by l***@gmail.com
Has anyone used one of these or does anyone have any comments about
their efficacy as a ball mill?  Wazs thinking about the large "Model B
- 15 lb Capacity" one with the hexagonal barrel at the bottom.
http://www.therockshed.com/tumbler2.html
I'll be doing relatively small batches but I've stumbled upon one at a
pretty good price.

The 15 lb tumblers won't turn 15 lbs very well. I've noticed that the
rating of ball mills is usually at the upper limit - a 3 lb rock
tumbler will not throw a 3 lb charge long enough to get it milled
sufficiently. They usually burn out the belts first. The Tumbler that
I have won't turn 15 lbs of weight without a lot of slipping. Also,
the speed of the drum is fairly slow - less than 30 rpm - you can
realize much more efficiency and speed by spinning the drum up to
twice as fast.

You could probably use ceramic media and get a better result - but I
haven't tried that.

I settled, like others, on using the barrel on a base that I made.

[d***@insightbb.com]

Post by l***@gmail.com
Has anyone used one of these or does anyone have any comments about
their efficacy as a ball mill?  Wazs thinking about the large "Model B
- 15 lb Capacity" one with the hexagonal barrel at the bottom.
http://www.therockshed.com/tumbler2.html
I'll be doing relatively small batches but I've stumbled upon one at a
pretty good price.

The 15 lb tumblers won't turn 15 lbs very well.  I've noticed that the
rating of ball mills is usually at the upper limit - a 3 lb rock
tumbler will not throw a 3 lb charge long enough to get it milled
sufficiently. They usually burn out the belts first.  The Tumbler that
I have won't turn 15 lbs of weight without a lot of slipping. Also,
the speed of the drum is fairly slow - less than 30 rpm - you can
realize much more efficiency and speed by spinning the drum up to
twice as fast.
You could probably use ceramic media and get a better result - but I
haven't tried that.
I settled, like others, on using the barrel on a base that I made.

I have the AR-2, and the model-B.
I found the AR-2 in the back of a buddy's truck after his yard sale,
and bought the model-B from a Lapidary friend.
The lips on the small cans are wore out, and the drive is too slow for
the B like LK says.
I can make plausable BP with the B.
I only charge the B with 500g.
I've done Ron Popiel's "set it, and forget it" with 800g.

[Däve]

Post by l***@gmail.com
Has anyone used one of these or does anyone have any comments about
their efficacy as a ball mill? Wazs thinking about the large "Model B
- 15 lb Capacity" one with the hexagonal barrel at the bottom.
http://www.therockshed.com/tumbler2.html
I'll be doing relatively small batches but I've stumbled upon one at a
pretty good price.

The 15 lb tumblers won't turn 15 lbs very well. I've noticed that the
rating of ball mills is usually at the upper limit - a 3 lb rock
tumbler will not throw a 3 lb charge long enough to get it milled
sufficiently. They usually burn out the belts first. The Tumbler that
I have won't turn 15 lbs of weight without a lot of slipping. Also,
the speed of the drum is fairly slow - less than 30 rpm - you can
realize much more efficiency and speed by spinning the drum up to
twice as fast.
You could probably use ceramic media and get a better result - but I
haven't tried that.
I settled, like others, on using the barrel on a base that I made.
I have the AR-2, and the model-B.
I found the AR-2 in the back of a buddy's truck after his yard sale,
and bought the model-B from a Lapidary friend.
the B like LK says.
I can make plausable BP with the B.
I only charge the B with 500g.
I've done Ron Popiel's "set it, and forget it" with 800g.

I do 1500g-2000g batches of BP with lead media in 3-5 hours in the B drum.
I rotate and tap the drum every hour to loosen and redistribute the comp
that gets trapped in the corners. Three hours is sufficient for BP lift and
BP rocket fuel. The RPM is closer to 60 with my base.