This Is a simple blog showing you how to make the mechanical portion of a fish feeder using easily obtained parts and a couple of hand tools:

 

 

Specs:

 

20mm:

-federate [need to measure this]

-can handle food upto 4mm

 

25mm

-1L/min Federate with 50:1 ratio box

- can handle pelted food upto 6mm

 

What you will need:

 

Tools:

-Hand Drill

-Allen KEys

-Philips Screw Driver

 

25mm Feeder Parts

     >25MM X 235MM SDS auger wood drill bit                                                                           

     >25mm Pvc Inspection Tee                                                                                                         

     >28mm metal saddels [28 mm MSBZP] two of these                                                       

     > Aluminum Flexible Shaft Coupling  6mm to 10mm [SDS is 10mm, motor 6mm] 

     > MFA 919D 12v dc motor, 50:1 and lower gear ratio                   

     >8 wood screws

     >2’ Length  of 3x2” wood

     > 5cm length of 25mm PVC piping [for fitting the hopper]

 

As You can see the Motor is an expensive one, I had one of these knocking about but any similar power slow rotating  [120 rpm and below] 12v motor should work. It is important to get one that has a shaft height [ie the heigh of the shaft above the mounting plate] of blow 14mm. If it is lower you can always mount the motor on a shim.

 

 

20mm Feeder Parts:

     >20MM X 205MM SDS auger bit

     >20mm Pvc Inspection Tee

     >25mm Pvc Saddels [two of these]

     > Aluminum Flexible Shaft Coupling  4mm to 10mm [SDS is 10mm, motor 4mm] 

     >Electric 2 Pin Connector DC12V 40-50mA 10RPM DC Geared Motor  

     >8 wood screws

 

 

 

 

Feel Free to use this design, modify it and make it better if you can see a way to do so.

 

Want to bring your fish feeding into the rest of the automated system, the next blog will be on controlling these feeders to optimise fish growth. Take a look at the previous blog for a outline of the types of control:

Automated Green House Blog:3 - Fish Feeding of the Future

 

Still waiting for my competition Kit to get the real work done,

 

Mike

 

 

Please take a look at my HackaDay Blog "Fly Wars" and give it a like to get the project into the next round:

 

https://hackaday.io/post/21772