About the Author
Hi, I’m Gregg Christopher.
Making a Mecanum Wheel Rover from Scratch!
Mecanum wheels are a nifty invention that lets a vehicle drive sideways by attaching small rollers to the outside of the wheel, angled 45 degrees off the main axis of rotation. I’ve always wanted to play with them, but could never justify the cost of buying them pre-made. Each wheel alternates the angle of the rollers, so when they counter-rotate, the vehicle can drive sideways. Forward, backward, and diagonal translation are also possible, as well as skid-steering-style rotation. Though fun…
A Dual Extruder Design for the Rostock Max V2
Why? The goal of this project was to implement a dual extrusion modification for a SeeMeCNC Rostock Max V2 delta printer. The secondary goal was to challenge myself to design any new parts from scratch as a learning exercise. Once built, playing around with options like multicolor or multimaterial printing should be fun! Although an imposing project to start, I was surprised to get such good mechanical performance from the design. Most of the print challenges in early testing can…
Packrafting Windy Creek 2015
This post is incomplete! Need to write up how the owners put up nice new signs. Windy Creek is possibly the most popularized packraft day trip in the Denali area, and the one that edges into Denali park
Rationale for a Minimalist Backcountry GPS
The purpose of the GPS is to: – supplement map and compass as the primary means of navigation. – as a measure of safety when my skill or mental state might be good enough for the circumstances. I will always be carrying maps appropriate to my planned and alternate route(s), a compass, and know the current magnetic declination. Skurka’s note: http://andrewskurka.com/2012/why-backcountry-gps-units-are-overrated/ http://www.rei.com/learn/expert-advice/compass.html Desired GPS Features: – Display location such that I can find it on the map. – Pre-load waypoints…
Why Do I (Want to) Know These Knots?
Ever since I was kicked out of the Boy Scouts, I’ve wondered about all the nifty knots that I haven’t learned. Sometimes I’d even read big books o’ knots and practice lots of them. In the end, I didn’t retain anything and I spent years basically not knowing how to tie any knots at all. I thought, “Hey, I’m a nerd. I can learn anything,” and just assumed that the skill would come. It didn’t, and it’s clear that I’m…
Hello world!
Have you ever been in the middle of explaining something and realized partway through that you were wrong? This is the place where I get a chance to do that, only online. “You don’t know something until you can teach it.” One point of this blog is to force myself to write complete discussions on a topic so that I have to organize and review my own thoughts. Even for a largely hypothetical or nonexistent readership, the act of writing…