Category Archives: #CAD

DropBOB PRO “Hit-Single” release


So I’ve been back from holidays for about 2 weeks now, what do I have to show for this? Well, to be honest, not as much as I’d hoped. I’ve actually been struggling with a little bit of mild anxiety. This all started sometime while I was in Europe on vacation. I didn’t know it at the time, but it turns out Nasonex (a nasal steroid for allergies), has some side effects that actually affect me. Anxiety is not something I have ever really had. So it caught me off guard.

I’ve stopped using the spray for about 2 weeks now and the anxiety is almost completely gone. It only pops up if I don’t sleep enough now. This made me a little more aware of what people who suffer from anxiety feel. It’s not fun. It makes you doubt even your own rational thoughts. My anxiety was actually centered around “being stuck somewhere” … like planes, or even a restaurant. Anytime that I would be forced to not move, whether because of norms (like at a restaurant or movie theater), or in a plane or bus, my hands would sweat, and if I thought too much I would actually get a full on panic attack where my chest would feel warm and my heart would beat faster. I managed to keep it under control though.

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DropBOB commissioned project – Pyramid Head – Materials Purchased for Manufacturing!


So the approvals are back! The Etsy listing updated and the order confirmed! Things are rolling.

I’ve purchased all the materials needed from the hardware store. I’ll be picking this up tomorrow. Just in time for me to begin manufacturing on the weekend. Stoked!

DropBOB commissioned project – Pyramid Head – Approval Drawings


So I’ve been busy working on finishing the Model and coming up with a good set of Approvals/Layouts for my commissioned Pyramid Head Cosplay. It’s been a real hit on my Etsy Page.
I’m not quite happy with these yet, but it’s a start. I often berate the drafters at my “other job” for having terrible drawings … but making drawings from scratch is hard. Especially when the information you want to convey/receive is not fully defined yet.

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DropBOB Designs: learning a new skill!


So I’ve been wanting to do this for a few years now, but I’ve never had the patience to really devote some time to it … Until now.

Rendering of partially designed board (top view)

I’ve been learning circuit board design and component selection. I’m hoping to not only simplify the entire wiring design for my cold brewer. I’m trying to expand its capabilities tenfold.

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DropBOB PRO – Preliminary design update


Some of you may be wondering what I’ve been up to over the last little while. I haven’t posted anything, nor have I put my “Star-Lord” Costume up for sale. Well, it’s because something has been bugging me. I’m unsettled about one of my designs … and its preventing me from focusing on other things. 

As you can see from the above image, I’m working on a PRO version (i.e something you’d see in a coffeeshop or a coffee enthusiast kitchen). All, while improving on the DropBOB control mechanism.

You see I’m no longer just happy with having the most accurate and flexible cold brewing drop control on the market. I want more! … I’ve added temperature control as well now. With a little bit of testing, I’d like to not only be able to have my drops colder, but also hotter, all at the slide of a finger on your smartphone.
I’ve also added a second photo-interrupter for a drop anticipation feature. And I’m getting rid of the Long neck that hung below the water (that was a standard plumbing parts restriction) … I’m also designing my own valve … And making the glass custom. Oh, and making dishwasher friendly.
Ya, I know … this is ambitious. Here’s to 2017 being the year “DropBOB Designs” takes off. I hope.
Cheers,
-D.B.

Closed loop drop-BOB: the only cold drip coffee maker you can count on!


So I’ve completed my design. I’ve converted my 3d printable files to STL files and have sent them off to the printer: www.3dhubs.com. fingers crossed that everything comes back nice … you never know with these types of “compact” housings… Plus this is my first functional 3d print … Everything else I’ve done in the past was not as critical.

With this initial beta release, I can control my coffee maker from anywhere. I can check the progress of how it is doing. and I can adjust the flavor profile depending on how many drops per minute (DPM) & grind type I use. And I can know that it is always exactly where I want it because it’s a closed loop system with constant feedback.

Features:

  •  real-time drip-rate monitoring
  •  drip rate selection using micro servo
  •  fully functional wifi-enabled controller (hackable arduino) files shared on Github … 
  •  LiPO 850mAh battery for anywhere brewing
  •  5VDC battery charger (micro-USB same as your phone)
  •  fully customizable monitoring display (it’s your phone) Server & app run by Blynk
  •  use any of your favorite glasses or mugs.
  •  industrial pipe design
  • (planned feature) ETA
  • (planned feature) battery monitor

Closed Loop Drop-BOB … The Cold Drip Coffee maker that could!


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
  • Hack-able
  • 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) 
The worst part is that I did not want to settle on any of these criteria … none more important than the other, but all required.
Cold Drip Coffee Maker – “Closed Loop Drop-BOB V1.0” (**Name is a work in progress)
Let me remind you of the progression of the designs prior to V1.0:
V0.1 – the proof of concept
V0.2 – functional prototype
V0.5 – New and improved looks

And now, just recently out of the Alpha stage and graduating to the Beta testing stage: The V1.0 – “Closed loop Drop-BOB” (Name is a work in progress) … The model is not fully manufactured yet (still a few parts on order & to order at the moment). But here is what I’ve got so far:
It all started with the simple wooden bracket shown above. Even though this is not what I want for the final V1.0 product, It helped me visualize what I actually want.

Once I made the bracket, I quickly drilled and taped the brass plug and attached it. Oh, I skipped the part where I cut glass … I’ll come back to that.
This is the part that actually gave me a kick in the ass to make this thing. Since I took apart my original prototype, I’ve been drinking peasant coffee (you know from an espresso maker, like the rest of the world)… After tasting this liquid nectar from the slow drip process, I was all hyped up and wanted to finish this new and improved version.

 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.

Seems to work nice. Got the distance I was looking for by connecting the 1/8″ compression thread valve to a flared copper pipe, to a female MIP, to a 3/8″ OD short brass pipe and connected all that with some O-rings to prevent leakage … I feel like I can optimize this later for cost and simplicity, but good enough for V1.0.
Here’s where all the magic happens. This little box is less than 2 square inches … And packs the servo, the valve, and the photo-interrupter all in a tiny little robust package. (The wireless controller ESP8266 will also be fit into here shortly … if it ever arrives)
Once this think is fully built, I should be able to control and monitor the drip rate from my smart phone … from anywhere in the world!