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Thread: Metal dust catcher
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18th October 2016, 07:52 PM #1.
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11th October 2018, 08:50 PM #2.
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Some pics of the metal dust catcher catching sparks coming off a thin kerf cutting wheel]
Thin Kerf cutting wheel attachment for bench grinder - Page 4
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15th January 2019, 12:02 PM #3Member
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Hi BobL
Is there any thought needed for the inside of the drum - especially how far into the drum the inlet and outlet hoses extend?
Ian
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15th January 2019, 04:07 PM #4.
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Ideally the outlet from the metal catcher should be as high as possible in the chamber so the chance of it sucking up a hot metal fragment that falls into the catcher is minimised.
The depth of the inlet protrusion doesn't matter so much. I have shown this as optional in the drawing
Intuitively the closer the inlet duct is to the bottom the the less fine dust should make its way back around to the the outlet - however an incoming directed air stream impinging directly onto the dust on the bottom of the chamber will stir up the fine dust so this will lift more fine dust of the floor of the chamber - swings and roundabouts.
Perhaps more effective at fine dust separation would be to use a midline divider across the full diameter/width of the chamber as shown in this drawing. Make sure you leave enough of a gap for the air to get out. This does not stir up the fine dust in the bottom of the catcher as the air speed across the gap is lower that that coming out of the inlet
Screen Shot 2019-01-15 at 12.55.56 pm.png
Multiple barriers can be employed alternately from the top and bottom forming what is known as a baffle separator.
The will deftly slow the flow but it is effective if you need to remove more fine and mid range metal dust but I don't care if that goes through to the impeller or filter bags
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15th January 2019, 09:47 PM #5Member
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Thanks Bob
I was considering a small amount of water in the bottom to extinguish all sparks - any reason not to do this? I understand it is probably unnecessary but I’d feel better if it was there and I guess it would reduce dust as well going back out of the drum.
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15th January 2019, 10:10 PM #6.
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It will end up making a rusty sludge that will be a nightmare to clean out and also rust out the chamber. The sparks simply don't stay hot for very long as the large volume of air cools them down to air temp very quickly - with a bout 1m of air travel. The one think teh air won't cool down as quickly is a ho metal lump BUT they dont get very far because they are too heavy.
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