While creating a perch for our parrot, I stumbled upon something non trivial : if you want to assemble a box with non vertical sides, what cut angle are you supposed to use to have a nice assembly ? It's obvious that it should be a trapeze, but what would be the α angle ? Easy …
Category: Hacking
Egg shape and camshaft
Introduction For some tinkering, I wanted to be able to draw a standard, egg-shaped cam and compute the displacement it was generating. I thought this was a trivial problem, but I couldn't find anything, so I'll describe the path I used. As a side note, the end-goal was to generate some 3D animation with persistence …
Screen/laptop holder
Until recently, main screen was resting on thick book to be slightly higher and end up in front of my eyes. As part of a revamp of my setup, I decided it was time for an upgrade. I had some specific needs: my screen needed to be roughly 10cm higher than desk I have a …
Celtic knots
Technical wednesday, I'm back. One of my (new) hobby to kill a few minutes is to draw celtic knot. I've already been into this ~10 years ago and it feels good to do it again. For those who don't know, a celtic knot is a twisted loop. The fun part: there is some serious theory …
Week end activities
Last week-end, I did 2 crafting activities with the kids. First, my daughter had a doll clothes hanger that she broke. That's the cost of a very untidy room. So we decided to work on building a new one. She sat on my laps and did the measuremnt of the broken one, I used inkscape and explained …
Designing gears with inkscape
For a hush hush project, I need to use gears and I plan on designing and laser printing them. Theory I found this old article which explains a lot on how to make gears with (older) inkscape. It relies on the following technical reference. With new version 0.91, things have been a bit simpler. Unit can …
R.I.P Billy
R.I.P Billy, for thou shallt be reborn and never forgotten. I had an old Billy shelf which was starting to collapse and had the wrong color (moved from one room to another...). It was time to swap for a brand new one (yeah, trip to ikea!!!). The old one got repurposed in my cellar to …
