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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
im thinking of putting together a more formal etching device, but the nagging question i have is this. is there a non metallic pump for moving fluid, or should i use a mover stir stick with an RC servo off to one side.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I bought an etching station from circuit specialists. It uses a small air pump to agitate the bottom with air bubbles which moves the fluid. So, there you go. Go to Home Depot and get a tiny air pump, run some tubing to the bottom and see what happens.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
That Rubbermaid tub looks pretty flimsy to me. I use a 5 gallon poly bucket filled to 3 gallons, with a fish tank heater. I'm not saying that's the best way to do it, but it is cheap and fairly solid...even after 10 years.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
does H2O2 + HCl etchant need to be heated to be more effective? ( perhaps 78 F +/-2F ) id be able to get a small, cheap liquid heater cheap but its fixed at that temp...
or is heating this etchant a trivial improvement ? i have a fish bubbler thats already going to be added, but need to know if theres a hazard or a waste of time to heat H2O2 + HCl. obviously im trying to avoid ferric chloride.
im also having some polycarbonate sheet being thermo-formed, for 12US$ pretty cheap for a custom tank !
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
Location:
Posts: 329
For a pump with minimal things in contact with the working fluid, check out peristaltic pumps. The only thing contacting the fluid being pumped is the tubing inside of it. The tubing does wear out over time though, so it has to be replaced, and I'd suggest keeping the pump above the fluid level in the tank after you prime it so if the tubing does fail, all your etchant doesn't drain onto the floor. Flowrates are a bit low for their size though.
The Laing DDC, which is very common in PC water cooling and has a large variety of different top assemblies available if you care to change it up, is magnetically driven, and doesn't have a shaft seal to worry about, and its wetted materials list doesnt look too horrible. Not sure if all of those would resist etchant, though, as an oxidizer and acid mix is sure to be on the harder side of things to handle.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ConkBot, would silicone aircraft fuel tubing be compatible with a oxidizer like H2O2 ? that type of pump does interest me, and as youve said, id make it leak upon failure into its own container.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I'm not absolutely certain that these bilge pumps have no metal parts in contact with the fluid to be pumped, but they run off 12V and are submersible. They are also extremaly cheap for the small ones, and even cheaper from Ebay. They also have high flow rates which can be reduced simply by using a reducer in the pipe:
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Etching Circuit Board Station.
