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PCB Etch Tank
Plexiglass was my material of choice for my etching and exposure boxes.
The panels are chemically welded with methylene chloride. Plexi welding is very easy with methylene chloride but you need to make sure that you do this out doors and wearing a proper respirator. I have selected the 3M 6800 full face.
I mixed cupric chloride from pool acid(30 percent hcl) clear volume 40 hair bleach (peroxide) and scrap copper.
Cool thing about cupric chloride is that unlike the competition it can be regenerated by bubbling air though it.
Somewhere I have a picture of the aquarium pump I used to do this I'll try to find it and add it at some point.
The other neat thing about the bubbles is they help break the boundary layer over the board you are attempting to etch. Put simply they knock used or depleted acid clinging to the surface of the board away and fresh acid circulates in.
A constructed a wooden crate large enough to hold the etch tank and a rinse basin. I used silicone culk around the bottom corners and edges on the inside. I also gave it a plastic lining inside the wood. Cooper chloride isn't incredibly dangerous but it does pose some environmental concerns. A safety container was designed to minimize these. It was basically built heavy enough so the only way to drop of acid was to be spilled was if a tornado sucked up the box and at that point I figured roughly 24 oz of copper chloride was not going to bother anybody in the scheme of things.
Do you have a lawn tractor you use to plow snow? Ever wondered if you could make a manual snow plow attachment into a push button? A friend of mine had a riding lawn mower and snow plow blade attachment. Every winter he used the riding lawn mower to plow the driveway. The plow was a kit that bolted on the front of the lawn tractor and it had a mechanicaly actuated adjustable snow plow blade. The issue and this project came about when the arm to adjust the snow plow blade broke. I had just bought a mig welder. I had also watched linear actuators capable of handling 300lbs of force drop to $25 on ebay. Here's what I came up with for converting a riding lawn mower snow plow into an electricity adjusted lawn tractor plow. Repair The lawn tractor snow plow kit had seen better days. The fork that attaches it had bent /deflected and spread. I used a map gas torch and a bench vise to squeeze the tongs back and then welded some L channel angle iron on the sides. Less Play I also tack weld
In this multi part series on diy circuit board manufacturing/fabrication I'm going to cover my diy, vacuum pull down UV LED exposure box. If you are looking for a description of the entire fab process click here UV Exposure Rig The photos bellow are of the uv lithography exposure box I cobbled together. It also features vacuum pull down. The source: A 4.1w High luminous efficiency 365nm UV LED. Sourced from digi key mid 2016. Model LZ1-00UV00
This post is for anyone interested in owning or building a CD welder. I wanted a reliable Resistive spot welder for lithium ion pack construction and or repair. I didn't want to spend 3k or buy from china. I decided to design and fabricate my own. Bellow is my first crack at a Mosfet Switched capacitive discharge mcu controlled spot welder. This post is a work in progress. If you've stumbled across in hoping to build your own cd welder feel free to ask questions in the comments section. I'll provide any help I can. My CD Spot Welder Here's pics of the first working version from 2018