So its been longer than I’d have hoped for this post, but I was so torn in my design ideas that I decided to wait a little. I let the ideas settle in my mind and eventually, the inspiration came!
I had a few design criteria to make this Cold Drip coffee maker:
- Simple & Elegant
- Easy to manufacture with many “off the shelf” components
- Not offensive to Jenn’s Eye (The wife) … so It can be kept in the kitchen
- Has a certain “Bobby Style“
- Not too expensive (I’ll probably optimize this later)
|Cold Drip Coffee Maker – “Closed Loop Drop-BOB V1.0” (**Name is a work in progress)|
|V0.1 – the proof of concept|
|V0.2 – functional prototype|
|V0.5 – New and improved looks|
It was so good to see this familiar coffee colour (Canadian spelling eh). And since I started making smaller batches, I was able to minimize waste. It takes the same amount of grounds to make 2 shots of extra delicious cold drip, as it does to make 2 shots from an espresso maker … This is for those who think Cold Drip costs more on grounds … not necessarily.
So back to the glass cutting part. This is the part of the design that forced me to re-think my ways … At first I wanted to make my own water reservoir because I couldn’t find anything on the market that would work with a drip valve (open at the bottom & the top). I also wanted to potentially control the temperature with a peltier plate … but that will be for a later version.
I eventually came to the conclusion that I should modify a container to suit my purpose. Diamond tip glass cutting bits are a little expensive (but who am I kidding … I love buy new tools).
I did the entire cut on my drill press, with the glass inside another glass filled with water. Make sure you have no air bubbles.
The hole came out nice. Only a few little chips were missing, but nothing I can’t deal with by using some washers and O-rings.
This part was the most tricky … and the reason I spent over a hour standing in front of the brass fittings part of the local hope depot store.
Turns out that compression fittings are not easy to combine with other types of fitting .. like MIP, and Pipe treads, etc … I needed some distance between my valve and the glass ,so I can add my little beauty of a “Close Loop” servo control box (more on this later) … You see, the next great idea I had was not to connect anything other than a single hole to the bottom of a glass (or, steel, or wood, or coconut, etc). This allows me to use virtually any container that I can make a 3/8″ hole at the bottom.