Gallery, Projects and General > The Design Shop
Dust control for TCG and surface grinder
PekkaNF:
Tested this 100 mm hose and 160 mm funnel with saw dust extractor.
On positive note:
+ the extraction is good enoug i.e. fan pulls most of the grinding dust away.
+ no sparks escapes
However:
- a little of dust escapes and deposits pretty far....I wiped the surfaces and found some black dust more than meter back
- noise of wood chip fan completely overwhelms the grinder
If I continue using this fan, I need an all metal separator can and have to put some filter element on exhaust, the standard clothe bag is not very efficient.
I am going to test with a small, but better design and location nozzle, because I have a cyclon separator for it and shop vack is smaller. I am going to see how it is different to larger air volume system.
Now my main concern is to prevent dust from spreading everywhere....completely separate room is not possibility and curtains would take up some real estate even when pushed out of way.
I wonder how much it would help to put a self (and fire resistant board) at the side of the grinding machine. I could move some stuff around and not to loose too much space.
Pekka
gerritv:
This is from a notebook that my uncle wrote in the 1976, he worked for Kiekens in NL specializing in air, dust etc control. The gist of some other notes in the 'book' is that it is the speed of airflow that makes the difference. for the <125mm diameter you should have 225cfm or 6.5cubic m/min.
PekkaNF:
--- Quote from: gerritv on August 05, 2018, 06:04:09 PM ---This is from a notebook that my uncle wrote in the 1976, he worked for Kiekens in NL specializing in air, dust etc control. The gist of some other notes in the 'book' is that it is the speed of airflow that makes the difference. for the <125mm diameter you should have 225cfm or 6.5cubic m/min.
--- End quote ---
Thank you, you show that before and I paid attention. The fan I used for this experiment is 760 m³/h (according to spec.) i.e. 12,7 m³/min. It does suck all the particles that leave the grinding stone towards the funnel, and there is enough airspeed to keep the funnel/suction hose clean. I have a theory that the grinding stone guard does not contain all the dust that rotates along the grinding stone and some of that is kicked around.
You are correct on air speed, it is very important on any dust removal system (or paint chamber, or draft cabin).
This would be no problem if:
* I had a separate room for this
AND
* I could pump all that suction airflow outside and would have an opening for incoming air (size large enough, not to restrict flow and small enough to allow min. 0,3m/s of flow to contain the dust in that room.
But I don't have separate room for this....I think I have two avenues: Try to remove as much as possible dust where it is being made (this might include adding a suction to grinding wheel guard) and/or use welding drapes and some cabinets/sheet/board to surround the grinding machine partially.
needs more testing :zap:
gerritv:
Sorry PekkaNF, I sometimes forget what I posted where :-)
I am thinking of using shower curtains around my grinder area in addition to a cyclone and adequate shop vac type thing. A damp towel hung in the path also helped so far.
We have a lot of surplus squirrel cage fans from 1960's mainframes, will have to look up their specs. They had no problem sucking up sound deadening foam that wasn't glued on well enough.
Gerrit
PekkaNF:
I am thinkking of turning one cabinet sideways and putting one welding curtain to isolate partly 1/3 of garage when I do grinding, but first I try to get is behave well in first place.
Today I tried a different approach:
Shopvack
50 mm dust collector as close to spark fan as possible
Cyclon separator
Well, Results are inconclusive:
1. That collector is really close to "action" and even though airflow feels small it seems to coller really well
2. there is more dust on the grinder table and magnetic chuck than on previous test with 100 mm hose and funnel collector on the table. BUT less dust (hardly noticeable) one meter away from the grinding machine :scratch: I had some paper sheets to collect the grinding dust on the same places than before. I don't get it.
3. The cyclon worked really well, it collected all that got into nozzle, there was absolutely nothing int the vacuumcleaner.
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