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  • Results 1 to 17 of 17

    Thread: New project: Building an RDF

    1. #1
      Jaymeseywaymsey's Avatar
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      New project: Building an RDF

      Project Iíve been playing around with for several years, and finally, I have the free time to prototype it. Iíll update this thread as the project develops.

      Part I: the drum. .25 HDPE, 80 micron 316 mesh.
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    2. #2
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      Should be fun to watch it come together!

      --Steve

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      kimini is offline Senior Member
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      The drum assembly needs to be strong enough to fully support itself when completely full of water. Is it? That can occur if the cleaning spray stops for any reason (like, someone hits a fire hydrant on your street and the water gets shut off). If that happens, the screen loads up until fully plugged, and the outlet side drained faster than the pump is using it. All the weight is supported by the screen itself, so while the drum itself isn't at risk, that weight is fully supported by the ends of the drum.

      Separately, the big gear at the end of the drum looks like it'll be driven by a second gear above the water level. Keep in mind that if the above happens, there'll be a big off-axis torque trying to push the drum sideways out of its support rollers, so it's another design challenge.
      Last edited by kimini; 05-01-2021 at 09:18 PM.

    4. #4
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      All accounted for. Open end of the drum will be locked in place with upper and lower grooved rollers. (Plus the uhmw seal on the drum.

    5. #5
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      Nice looking drum...good job. I'm looking forward to watching your progress.

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      Oooh! I loved watching......
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      I have served, I have fought to defends the rights and freedom for all Americans. I am a proud Retired Veteran!

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    7. #7
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      Spent a couple of hours prototyping the roller assemblies for the open end of the drum. Now that I have a design that I like, I need to mill the additional ones.
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    8. #8
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      Spent the morning creating the filter ends and center partition. Next up is creating the toolpaths for the router to mill them.
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      Very nice. How did you fabricate the hdpe gear? What is the lattice made of? And how did you glue/bind the mesh to the lattice?

      Brent

    10. #10
      NaturalK is offline Senior Member
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      Where are the exit holes for the output end?

    11. #11
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      Quote Originally Posted by Alarakalama View Post
      Very nice. How did you fabricate the hdpe gear? What is the lattice made of? And how did you glue/bind the mesh to the lattice?

      Brent
      Everything is milled on a cnc router. The lattice is pocketed .25Ē HDPE, clamped and welded in place.

    12. #12
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      Quote Originally Posted by NaturalK View Post
      Where are the exit holes for the output end?
      For my prototype, I am going to have it on the side to conserve space. Since HDPE pipe isn’t readily available, I’m constructing a pvc flange assembly that will bolt on with a gasket for sealing.

    13. #13
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      Roller assemblies finished. Now onto the exterior panels.
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    14. #14
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      I think I want you to be my neighbor ! Some good fabrication skills going on there.....

    15. #15
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      Quote Originally Posted by stevek View Post
      I think I want you to be my neighbor ! Some good fabrication skills going on there.....
      Thank you!

      Lots of sleepless nights researching obscure Dutch koi keeping websites for the past 7 years. Funny thing is, this actually kick started a new career for me. I didn’t even know what a cnc router was, prior, and now I’m a CNC operator by trade.

    16. #16
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      Productive day so far. Milled center partition and mounted rollers and drum frame. Test fit temporary closed end spindle. Rolls well with minimal binding. Once everything is welded up, it should roll smoothly. Next up is output panel.
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    17. #17
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      I'm totally jealous of your CNC skills. With some drop-in UV, this will look like the Alienware of Koi filters.

      Keep up the good work!

      Brent

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