| The Shop > CNC |
| Cetus3D 3D Printer |
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| awemawson:
How did I ever manage without a 3D printer ? :clap: Today our front gate, which is electrically operated, opened spontaneously. Now it's being doing this when it rains hard, and I'd tracked it down to the pedestrian entry keypad, which gives a closed relay contact to the controller to open the gate. As a temporary expedient I had removed the 12 v supply to the keypad so that it couldn't operate it's internal relay - BUT TODAY THE GATE OPENED :scratch: Investigation showed that water had entered, and there was a heavy rust streak on the plastic between the Common and Normally Open terminals that presumable was borderline able to conduct enough to open the gate. I pulled it apart, cleaned it up and bench proved it all as working, but as well as giving it more shielding from weather, I wanted to spray the internal PCB with a waterproof 'con-formal coating' that is excellent at improving insulation in damp conditions. However it is also an effective glue, so it needs to be kept out of things that need to move, like the switches on the PCB that the external buttons operate. Now things like the edge connector, and a plug in I/C could be masked with masking tape, but those tiny little switches defied my banana like fingers, when it came to trying to mask them. SO PRINT SOME COVERS - after all YOU HAVE A 3D Printer :lol: Quickly knocked up a Fusion 360 model, printed them and the conformal coating is drying as I type this :clap: |
| spuddevans:
Nice one Andrew :thumbup: :thumbup: Only problem is, once word gets around, everyone will be asking you for "a little favour". After all, you just have to push a couple of buttons and "Poof!!" the desired item magically appears :lol: :lol: Tim |
| PekkaNF:
Pretty nifty! Just out of curiocity: the nozzles on your "Hydroponic Pig Cooler" are they round orifice ones, or do they have a slit or flexible flapper? Pekka |
| awemawson:
--- Quote from: PekkaNF on May 27, 2017, 07:08:57 AM ---Pretty nifty! Just out of curiocity: the nozzles on your "Hydroponic Pig Cooler" are they round orifice ones, or do they have a slit or flexible flapper? Pekka --- End quote --- The end cap that screws on has a very small round hole, but the cap traps another bit of plastic that has a helical groove in it so that the water is already dizzy before it squirts through the hole. I presume that getting the water spinning aids the mist formation :scratch: |
| PekkaNF:
--- Quote from: awemawson on May 27, 2017, 09:30:32 AM --- --- Quote from: PekkaNF on May 27, 2017, 07:08:57 AM ---Pretty nifty! Just out of curiocity: the nozzles on your "Hydroponic Pig Cooler" are they round orifice ones, or do they have a slit or flexible flapper? Pekka --- End quote --- The end cap that screws on has a very small round hole, but the cap traps another bit of plastic that has a helical groove in it so that the water is already dizzy before it squirts through the hole. I presume that getting the water spinning aids the mist formation :scratch: --- End quote --- Not sure if I follow, but that sounds morre like a structure made for metering a certain amout of fluid. Normal short orifce (hole in the disc) or such has drawbacks if very small hole is made, small diametrs are hard drill/debur, thye clog easy and wear. Longer restriction normally works better on tose accounts. But instead of long hole ususally a threaded hole is used. Like on oil metering orifices on some machine tools (I think brigeport table has that). In oil metering componenets are cheap: Taps of knwown accuracy are produced and set screws too. If the metering orifice blocks, cleaning it is a matter of openeing and closing it. Adjustment is easy: Choose diferent lengt of set screw,, precise location is not needed just lengh. It still could have same priciple and retai ease of cleaning if ti is sort of groove on cylinder suface and pluggs to cylinder. Or I may have got wrong altogether. Pekka |
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