Yoon Chee Tuck – watercolor artist, seascape, landscape, malaysia, sea, river, water

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Laser Exhaust Flexible Duct 30

Oct26
by Thomas Yoon Chee Tuck on October 26, 2021 at 1:41 am
Posted In: CNC, DIY

The Movable Gantry CNC machine fitted with a laser module moves about the work space according to the program g-code interpreted by LinuxCNC. As the machine was not totally enclosed, I had fitted a protective shoe to the laser module so that no stray laser light would be able to emerge from the target spot. Another important function of the shoe would be to act as a collection hub for any smoke. Smoke generated when the laser light burn the work piece had to be remove to prevent damage to the lens or to the work piece.

In my last blog, I discussed how I fabricated some fixed pvc piping and installed the exhaust fan for them. In this blog, I discuss how the flexible ducting was fabricated. It’s true that I can buy ready-made flexible ducting on the market, but in the spirit of diy and cost saving, I did it with raw materials that I already had available.

Some of the materials that I used included thin polyethylene sheets cut out from hotel laundry bags, 3″ diameter PVC pipes, some cellophane tapes, some galvanized wire, an empty sardine can, an empty PET bottle, and some small magnets.

As the fixed ducting was placed quite high above the cnc machine, I made the flexible ducting long enough so that it would not be stretched too much even when the movable part had to move to the furthest reach in the machine. I found out during testing that in order for the flexible duct not to collapse due to the suction pressure from the fan, the ribs needed to be placed close together. This would mean more ribs had to be installed for it. Ultimately, I had to strike a balance between having more ribs and therefore requiring more work cutting them, and producing an acceptable working flexible ducting.

One end of the ducting was attached to the top fixed PVC pipe, while the other end was attached to a cut-out sardine can. The sardine can formed quite a good fit to the laser module part.

With such a long ducting, how did I store it when I didn’t want to use it anymore? Remember, I use this cnc machine also for milling, plotting and drag knife cutting. At these times, I just replace the laser module with a milling spindle, pen holder or drag knife holder respectively whenever I need to change the nature of the work.

Since the flexible ducting could be compressed like a concertina, I compressed it like so and enclosed it into the cut-out body of a PET bottle. I then used some small pieces of magnets taken from earphones to attach it to the sardine can end. These magnets effectively holds the flexible ducting in place in storage.



└ Tags: duct, exhaust fan, flexible ducting, laser, laser engraving, laser shoe, linuxcnc, making flexible ducting, movable gantry cnc machine, smoke removal
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Laser Exhaust Fan and Fixed Duct 29

Sep26
by Thomas Yoon Chee Tuck on September 26, 2021 at 12:14 am
Posted In: CNC

The laser engraving did produce a bit of smoke. So I had to exhaust it away from my workshop.

I found a 2.2 cubic meters per minute centrifugal fan that would be very suitable for exhausting the smoke away. I was not enclosing the whole movable gantry cnc machine but would be using this fan as a means of removing smoke by attaching its suction to my laser module shoe. I decided that the fan be placed high up so that its discharge end would then be able to blow directly away from my house. It would also be able to be attached to the vertical slats on the wall by wood screws. The high position was also suitable for attaching to a flexible ducting, one end of which would be attached to the movable gantry cnc machine. As the flexible ducting would be suspended above the moving part, it would not be messed up when the cnc machine moved horizontally in its limited boundary.

Once the fan was attached to the wall above the cnc machine, I was able to plan the layout for the suction ducting. I had available some 3″ diameter pvc piping, salvaged from previously rainwater gutters. In order to connect them as 90 degree bends, I created plywood boxes with fitting holes which could act as elbows. I created 2 of these so that the pipe could change direction twice. These would be the fixed hard ducting.

Because I was not enclosing the whole movable gantry machine with a fixed barrier box, I had to attach the suction of the fan to the movable gantry cnc machine itself. This part had to be a flexible ducting because the machine would be moving.

I will not be covering the construction of the flexible ducting part here as this would be covered in the coming blog.



└ Tags: centrifugal fan, cnc machine, DIY, ducting, exhaust fan, flexible ducting, laser engraving, laser shoe, movable gantry cnc machine, pvc piping, smoke
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Thomas Yoon, Artist, Cartoonist, Engraver
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