hmm, got a slight problem my old ball mill sounds like a cement batching plant, so i need the tone the noise down a bit, are there any issues with the milling apparatus being enclosed in a box? the box is foam lined loose fitting with no fixings to the base and will have a hinged lid, also i mill out side and the jar is empty in the vid to show its full noise potential! noisey thing
noise reduction
Started by dr thrust, Jun 24 2008 08:29 PM
4 replies to this topic
#2
Posted 24 June 2008 - 10:40 PM
I'm currently digging a hole in the ground outside to put the mill in.
Both to reduce sound, and to prepare for possible explosion when milling BP.
Both to reduce sound, and to prepare for possible explosion when milling BP.
Videos visit: http://www.pudi.dk
#3
Posted 24 June 2008 - 10:57 PM
Chris I have almost exactly the same setup but am planning a new ballmill that is itself housed inside a sealed box with sound deadening and doors.
I do not intend to tiptoe through life just to arrive at deaths door safely!
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Click here to email me Personally,
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#4
Posted 24 June 2008 - 11:18 PM
With my "other job" being an acoustic/audio engineer I'll try to offer some help. Rule #1, if you can reduce the noise generation, you're quids in - so line your milling jar with rubber. Rule #2, most noise problems are increased by conduction to other objects that resonate/radiate the noise - so either sit your mill on something SOLID like a solid concrete/stone floor/earth or support it on some rubber blocks to isolate it from the substrate. Enclosing it in a box is a good idea, but you'll have to take heat buildup into account, not just from the motor, but a certain amount from the mill as well, after all we are milling explosives that can be initiated by heat. The box should be isolated from the mechanism (=not touching in any way) sealed with a dense foam gasket as far as possible, and ideally lined with an acoustically absorbent foam (do a search for Pyrosorb S). To get the necesary ventilation your best bet is forced air cooling through as small an orifice as possible, if there's a noise issue with this, forcing the output air path through zig-zagged bits of acoustic foam will give some useful reduction as well. Otherwise just make the box big to maximise heat transfer through the walls , and DO put a thermometer/thermal trip in to monitor the temperature. All this is assuming that you've got sufficient safety distances anyway, Pudi's idea of digging it in would be a good idea unless you've got a LOT of space and or no neighbours - if you think I'm being fussy get an old mill jar, drill a Visco sized hole in the side, fill with good BP meal and milling media, take to a safe place, insert (long) fuse, light and leg it whilst a mate films it!
Trying to do something very beautiful but very dangerous very safely....
#5
Posted 25 June 2008 - 05:51 PM
thanks for the input chaps just didn't want to make something that could be potentially dangerous, ill take on board everything you've told me, the rubber mat liner is a great idea,( the simplest ones always are!) and ill check for heat build up in the box and vent accordingly,
the foam lining in the box was free we've renovating a pub at the moment and all the floors in the apartments above the pub are having "sound block " chipboard with a foam/ rubber Matt/ foam sandwich glued to the bottom and i thought there must be a use for this? (skip rat chris)
the foam lining in the box was free we've renovating a pub at the moment and all the floors in the apartments above the pub are having "sound block " chipboard with a foam/ rubber Matt/ foam sandwich glued to the bottom and i thought there must be a use for this? (skip rat chris)
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