This is the easy ways and cheapest way to make your own etching machine for PCB / electronic hobbies, lots of DIY machine I have build for my home made project but I thing this one is the EASYest and the CHEApest way, or even will cost you not even $10 to build if you have the material wasted at your home and you not use it.
now I am going to describe the making process step by step
Step 1: Stuff Material
The material used to build this machine is basicly simple, only a few part crutial for the main item
so ...... lets Make it ....
Material use :
1. Plastic container to hold the unit (pump and etching liquid) -- Please make sure you only using the PLASTIC / RESIN / FIBER GLASS material otherwise if you use the metal thinging will cause you a disaster (since the plastic is corotion proof)
2. Mini DC pump -- this is the main unit to make this machine operated.
Basicly you can use any type of the pump, but again MAKE SURE the material is PLastic, NOT METAL. --- WILL BE EXPLAINED IN THE NEXT STEP
3.PLASTIC PIPE TO DISTRIBUTED THE LIQUID ECTHAN
4. OFF COUSE YOU WILL NEED A 12V POWER SUPLY (OR DEPENDING YOUR MOTOR SPECIFICATION) TO MEKE YOUR MOTOR RUNING AND PUMPING AND DISTRIBUTED THE ETCHAN LIQUID FOR YOU
Step 2: Motor Shaft Modification - Trick
THIS THE DETAIL FOR THIS STEP :
USING THE WIPER MOTOR SAME AS YOUR CAR USE
if you have your old car sitting in your garage maybe you can knock down this part :)
but you will found the dificulty and will have a great headace to find such as type of DC pump which is entirely build from plastic, especialy for the MOTOR,
To do this we need a trick to make the METAL part is COROTION proof and as much as possible remove the dirrect contact with the ETCHAN liquid.
after complete covering the metal shaft with heatsrink tube, you need to reasamble again as before
First Step you need to detach the motor body so you can get acces to the motor shaft which is this part is linked to the propeller to circulated / pumping the water
The point here is : YOU NEED TO COVER THE METAL SHAFT AT THE MOTOR USING MATERIAL WHICH IS MADE FROM RUBER / PLASTIC (IN MY CASE, I AM USING THE HEATSHIRK TUBE) COVER THE METAL PART ENTIERLY COROTIONLESS (THERE IS NO DIRRECT CONTACT WITH THE ETCHAN)
I don have a good picture for this steep but I am attaching my Hand Sketch and I am sure this will be easily understand.
I am re attching the process of the deasembling the motor and clearly shown which part need to covered with heatshrink tube.
Step 3: Plastic / Silicon Pipe Making
using the plastic pipe to deliver the liquid from the pumping motor :
using your sharp blade, slice the platic tube so the etchan pumping from motor is distributed
the size of the sliced is depending on your needed and your motor capacity (biger motor meaning the long sliced needed to make the liquid distribution more efective)
again I am attaching the hand sketch to be more clear
after you done, glued this pipe to your container so when operated the water flow is dirrected, also make sure you facing the SLICED side down to the floor of your container, so the water will flow nicely
Step 4: IN ACTION
after done with the step prefiously, this machine is ready to GO
this is the vidio how this stuf working