Sunday, June 19, 2016

Matt's DIY electric skateboard

My DIY electric skateboard build: 


Total watts: 3200~
Range: 12-15 miles* (per set of batteries. Batteries can be swapped in seconds are are light enough to fit in your pockets. With my setup I can charge a set to full in < 2 hours from 5%)

Top speed: 15-20 mph 

Capacity: Easily capable of caring 250 pounds worth of rider & gear. Likely would handle a 300 pound rider no problem.

Final BoM:

// Amazon prime
Deck: $73
trucks: $40
bearings: $18


// Hobbyking

motors: $80
Lipo's: $180 (2 sets of 8AH 6s. 12-15 mile range per set)

ESC: $70

tax & shipping: $40
total parts: $550

 Grand Total: $590!!!!

The ride:

I took it out for a nice 3 mile ride. The ride included stop and go, hills, flat areas, rough patches, and super smooth patches. I didn't really attempt full throttle as it goes too fast for my own comfort. I will need to work my way up to full speed. I can say this.. I was flying past cyclist. It was pretty smooth ride and incredibly fun. I opted for massive 97mm wheels which handle rough patches of road and bumps with ease. The brakes are kinda weak but are helpful when going down hill. They help slow your down. Because of the huge wheels and style of board I got, I can drag my rear shoe on top of the wheel to help slow the board down as well. It works well for me.

Thursday, December 4, 2014

R2D2 update

Here is my beloved R2D2 project. My wife and I did this as a joint project together. It's far from perfect, but still a pretty cool decoration.

I need to get my 3d printer back online in order to print out the remaining parts. All of this is either laser cut, 3d printed, or hand crafted. He is wired for motors, but I have no plans to motorize him.

Still need to create the blue parts, and dome accessories.

Wednesday, May 28, 2014

DIY CNC plasma cutter (in progress)

This is my DIY CNC plasma cutter. It is 100% built from recycled parts. The total cost to build (with the exception of the plasma torch, is < $200. It is very much a work in progress. I am working to reduce backlash, and improve precision. I have only just recently attached the plasma torch, and just need to wire up a controller for turning the torch on/off. I am planning to use a waterless grill for V1. I am also looking at upgrading the linear rail system to one based on openrail, for more accuracy.

Friday, May 23, 2014

The closest thing to a real lightsaber

This incredible project fulfills a childhood dream... I always wanted a real lightsaber. I have made several in the past, but those didn't cut through thick steel like the Jedi's do. I decided it was high time, I remedied this problem. I found a bunch of scrap parts, and turned the hilt on a lathe. I then bought a CNC torch head for a plasma cutter, and modified it to fit inside of my hilt. Watch it cut through steel like... well, a lightsaber.

Thursday, April 10, 2014

The perfect coffee maker

TL;DR: This thing makes amazing bitter-less coffee, cost only $150, and was built in one weekday evening.

This contraption is known as an Oji slow drip cold brew coffee system.
You fill the top with ice, and a bit of water.
You fill the center with coarsely ground coffee, and a glass filter disk.

You set it so the top container drips 1 drop of water per second, and the second container so that it drips 1 drop of water per two seconds.
This allows a pool of water to form in the middle beaker, maximizing extraction surface area.

Because you use ice instead of hot water, far less tannins and oils are extracted from the coffee. It also takes 10 times as long to extract the caffeine and coffee flavors out of the ground coffee beans; this is why the brewing process takes roughly 8 hours.

There are lids/filters on each beaker to prevent dust/hidden nasties from contaminating the brew during the 8 hours it takes to brew the coffee.

8 hours may seem like a long time, but if you start it before going to bed, its ready when your ready to drink coffee. Another cool aspect of cold brew is that it doesn't go stale (unless you heat it, at which point it will go stale if you don't drink it).

Because the coffee doesn't go stale you can supposedly age it and develop the flavors even further.

About the build: These setups normally cost at least $500 for a 12 cup system. I pulled this off for $150. I purchased the replacement parts from Yama (the beakers are uniquely suited for the task of brewing up to 12 cups of coffee). I purchased the glass filter (just wash, never needs to be replaced). I already had the carafe. Not pictured are the stopcocks for the top and middle beakers which are just glass valves for precisely adjusting the flow. I bought them on ebay for $20 each. I am still waiting for them to arrive so I rigged some vinyl tape stopcocks for the first brew.

I drew the design in cad, laser cut templates, and cut it out on a scroll saw. I sanded, primed, stained, lacquered, oiled, glued, and mounted in a few hours last night. 

Success metric:
  It needs to be as practical as a normal coffee maker in terms of cleaning, ease of use
  It needs to produce a noticeably better coffee than a coffee press.

The coffee is amazing. I am not a coffee snob. The purpose of building this was for the fun of building it. I expected to not be able to notice any difference in taste compared to other coffee makers being a non-coffee aficionado... I was super wrong. There is almost no bitterness. It is pleasant to drink black (I am a creamer guy). Everyone who has tasted it agrees unanimously it exceeds expectations in terms of taste (my wife was pretty skeptical about this project).

Tuesday, April 1, 2014

Exoskeleton for the girl with a broken ankle

My sister broke her ankle rock climbing. The crutches were annoying her and I thought I could come up with an engineering solution to the problem.

The straps are laser cut acrylic. I thermoformed them to the shape of her leg. On the inside of the straps is non-slip foam padding, and on the outside is industrial strength velcro.

The hinges have bearings in them. The general idea is you slip your leg in, wrap velcro around the straps, and your ankle hovers a few inches above the ground. A shoe riser goes on the other foot, and you walk with a cane.

The device worked as intended, but proved to be cumbersome to wear for long periods of time. It is also still easier to get around on crutches. The upside is, it did allow her to walk for short periods of time without crutches. This was version Mk I. We did three iterations before moving on to other projects

Thursday, March 27, 2014

Highly detailed wood inlays

 I had an unscripted maker day recently. The day consisted of making various random things. These are some of the wood inlays we created on my laser cutter. They turned out pretty awesome! We also did a bunch of welding, wood working, etc. But I wanted to show off some of the cool laser cut projects.