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Friability tester


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#1 Creepin_pyro

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Posted 17 August 2004 - 09:39 AM

Just narrowly saved one of these from the skip :lol:

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As you can see, it's not far removed from a ball mill - the jar has one giant lifter arm like this: used for testing the toughness of pills, I think.

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I think the rpm is about 50, and it runs sooo quiet, and has a timer function. Any thoughts on turning this thing into a mill? Would I be crazy to consider using the supplied jar? If so, I will start to think about attaching a larger jar directly to the motor - shouldn't be too hard :D

#2 Jerronimo

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Posted 17 August 2004 - 11:15 AM

Just narrowly saved one of these from the skip :lol:

Posted Image

As you can see, it's not far removed from a ball mill - the jar has one giant lifter arm like this:  used for testing the toughness of pills, I think.

Posted Image

I think the rpm is about 50, and it runs sooo quiet, and has a timer function.  Any thoughts on turning this thing into a mill?  Would I be crazy to consider using the supplied jar?  If so, I will start to think about attaching a larger jar directly to the motor - shouldn't be too hard :D

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I don't know if the motor will have the capacity to turn a jar loaded with heavy lead media and powder, It's as you say normally used for pills.
"Any society that would give up a little liberty to gain a little security will deserve neither and lose both."

#3 Creepin_pyro

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Posted 17 August 2004 - 11:26 AM

I had thought that, too. I think it will be able to handle it - it starts reliably with me holding on to the jar, and can take me grabbing the thing when it's in motion. It starts to humm a little, but comfortably resists me trying to stop the rotation - I don't think there should be a problem with power.

#4 Patrick

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Posted 17 August 2004 - 07:07 PM

I had thought that, too.  I think it will be able to handle it - it starts reliably with me holding on to the jar, and can take me grabbing the thing when it's in motion. It starts to humm a little, but comfortably resists me trying to stop the rotation - I don't think there should be a problem with power.

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If there is enough power, you'd just might have to worry about it tipping if you get too much weight on the jar side, if you add a wider jar.

Depending on how the parts are connected, I'd thing you'd be able to make a jar out of some pvc pipe .. maybe wooden end to secure it to the pill spinner. It'll just have to be narrow, but I think it'd work.

As far as the the supplied jar .. I think I'd try that first to make sure the motor can handle it. Then try a larger one, as the smaller won't hold much for media. Was there a lid for it?

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#5 Creepin_pyro

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Posted 18 August 2004 - 10:01 AM

I had assumed I would need to rest the jar on some dowel to take the strain off the jar/motor join, by placing the machine in a box. I will see how the thing looks with some media in the supplied jar. God knows how the milling would go with that massive lifter arm :wacko: . The jar lid is held on tightly by that black screw you see on the left of the picture - no thread on it, just held on.

#6 Richard H

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Posted 18 August 2004 - 11:28 AM

Why not just use it to test the friability of round stars? :D

#7 Patrick

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Posted 18 August 2004 - 10:28 PM

Why not just use it to test the friability of round stars? :D

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That's some creative thinking :blink: May be useful too .. I would suppose a completely dry star would be able to take more punishment than one that is still moist in the middle.

That could be a new pyro must have tool!!

#8 Creepin_pyro

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Posted 19 August 2004 - 09:02 AM

Why not just use it to test the friability of round stars? :D

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All in good time :D It shall be a mill first.

#9 Patrick

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Posted 12 September 2004 - 05:51 PM

Did you ever get this to work as a ball mill??

#10 Creepin_pyro

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Posted 13 September 2004 - 08:48 AM

Did you ever get this to work as a ball mill??

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I gave up on the idea. Main reason being I found a rather large ball mill in the same skip, which I managed to rescue :P

Just a little wiring to do, and I should have it running :)

#11 Creepin_pyro

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Posted 14 September 2004 - 12:46 PM

Woo! All wired up, and running smooth :D

I have got the jars supplied with the mill, which are HEAVY porcelain. What would these jars be suitable for milling? Obviously, I don't want a porcelain BP milling jar, but would they be allright for oxidisers, etc?

#12 Patrick

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Posted 14 September 2004 - 11:15 PM

Woo!  All wired up, and running smooth :D

I have got the jars supplied with the mill, which are HEAVY porcelain.  What would these jars be suitable for milling?    Obviously, I don't want a porcelain BP milling jar, but would they be allright for oxidisers, etc?

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Does everyone just use a round type jar or do you add some type of a lift bars?

#13 Jerronimo

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Posted 15 September 2004 - 02:17 PM

Does everyone just use a round type jar or do you add some type of a lift bars?

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That depends on the diameter of the container.
If you have a 4'' DM container you can probably do without them.
But if U use a container of let's say 8'' DM, lift bars will probably make the milling more efficient.

I myself use a 8'' DM millingjar without lift bars(still haven't has time to install them)and it works perfectly without them.
Good fast mealpowder in 4? hours.
Look on rec.pyrotechnics alot of ballmill info is available there.
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#14 pritch

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Posted 23 September 2004 - 05:44 PM

Where is this magic skip? ;)




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