Home      Projects     Experiments     Circuits     Theory     BLOG     PIC Tutorials     Time for Science

22 February 2010
Author: Giorgos Lazaridis
PCB Etching Bath with Heater and Agitation

Worklog - Bubbles!

The first "U" shape hose was a bad idea.

So much for the heater. Now i had to make the hose for the air. The first design of the hose was a U shape with holes at both sides. It was though a bad idea. I was not sattisfied with the result. The bubles from one side interracted with the bubbles from the other, the agitation was not even inside the tank. So, i redesigned the hose. After some tests, i came to the conclusion that the hose must be in a single line with holes on both sided of it in a "V" pattern. I fixed the hose at the bottom of the base with hotmelt glue. I used also hotmelt to close the open-end.

I used an 8mm diameter (external diameter) plastic tube, like the ones used in machines with high air preassure. To bend the hose, i used the hot air gun. As for the holes, i had to calculate the total area of the holes to be the same with the hose's area. I would use 1mm drill bit, and the hose from the pump has an internal diameter of about 5mm:

Hose Area = (3.14 x 52) / 4 = 19.635

Drill Bit Area = (3.14 x 12) / 4 = 0.785

Dividing the above numbers:

n = 19.635 / 0.785 => n = 25 holes

I drilled 13 holes from one side, and 12 holes from the other side of the hose.

 To bend the hose, i used a hot-air gun I formed the hose and drilled it With hot-melt glue, the hose was fixed on the base The base is complete!

Here is the tank with all the accessories attached:

And a test-run:

 Name  Email (shall not be published)  Website Notify me of new posts via emailWrite your comments below:BEFORE you post a comment:You are welcome to comment for corrections and suggestions on this page. But if you have questions please use the forum instead to post it. Thank you.