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« on: November 03, 2019, 03:13:32 AM »
A slightly better system this time around rather than just the 120 mm pipe over the laser head and fan.
My laser sits on a desk adjacent to a outside wall and not in a special cabinet
I purchased a white 300mm flower pot saucer, together with a 120mm selection of pipes, elbows and inline extractor all to fit the 120 mm pipework, in addition i purchased a enlarging reducing section to go from say 80mm to 130 mm pipes
I made a 120mm hole in the middle of the saucer and inserted the reducing unit, then cut off the bits I did not need, then glued the reducer into the saucer, as it sits on the wider part of the "reducer" it acts like a support for the saucer, see pictures, then on top of this I intend to put a 90deg elbow, then a short section to the wall and then another elbow to take it up the wall, A valve that closes the pipe and then a "T" then the fan, the fan will go into this pipe and then more pipe to follow about 1 metre high to take it to a point in the wall where I can drill a hole and exit the 120mm pipe and use a one way flap to stop air coming in from outside.
The inline fan runs at 100% power all the time and is very powerful so I have purchased a small fan regulator and this will allow me to alter the fan speed easily, I also have purchased some ultra bright circular leds that will go on the underside of the saucer and flood the area with light without distracting my eyes.
I have to cut out a piece of aluminium to fit the saucer and then cut the 120 mm hole in it and the leds will go on this and that will act as a heat sink and reflector as I will polish it, all the wiring goes behind the aluminium disc so wont be seen and the whole lot can then be glued to the bottom of the saucer, the wires will go up the tube and come out before they get to the fan and there will be a small switch there as well along with a tiny psu for the leds which will be fed from the fan power, as its only fine smoke there will not be any issues with the wiring and the psu is sealed. ( I could have purchased a 12 volt DC inline fan but its not as powerful)
Once thats all done the saucer will be placed of the middle of the CNC unit to suck up the smoke etc.
I have run some simple tests using a Joss stick and the smoke off that instantly gets sucked up into the fan unit from at least 40 cms away in all parts of the cnc working footprint at full power, at half power I just need to reduce the height to about 25cms above the cnc but the fan does not make that much noise so it shouldn't matter to much. I could use a pice of simple collapsing pipe here to adjust the height of the saucer.
That is the plan,waiting on the leds and fan regulator for final install, using a tumble dryer extension hose for the time being, Photo below is of the saucer and joiner.
The idea is I get a lot of ventilation to clear the area, I get bright controllable overhead lighting and my 3018 CNC nearby can also use the ducting by using the "T" in above the valve to take away the sawdust and smoke off that laser as well...
Bit more work but kill two birds with one stone and as my new workshop is in a room under our Lounge( house is on the side of a hill) no smoke smell in the house at all or dust more importantly !!! The intention is never to run both machines at the same time so i'm not worried about the risk of dust catching fire from the laser or lack of suction. More photos to follow once complete. ( Shortly I hope )