Mechanical engineers say : 80% of material failure are due to fatigue. What is fatigue? When a mechanical part is subjected to repeated load below ultimate strength but above fatigue limit. In other words : pull the handle once, no problem; pull a thousand times it breaks. That’s what occurred to iron casted handle. The upper ring which forms the pivot is split into two. I will cast a new handle, using the broken one as pattern but with a rebuilt ring carved in the mold.
Joseph is carpenter. Manly, he built wooden chairs. Now he can sign his work.
From left to right: the pattern, pyrography trial, pyrography stamp
More precisely, a little part from the door locking mechanism. On the right, the original, zinc alloy made, broken one. On the left, functional, bronze made, replica :
There is less and less blanks for old keys. When you can’t find one, the best way remains to cast it :
Original design by Guillaume Ramillien, architect :
Based on a Sketchup file I order 3D printed patterns of buildings designed by Guillaume. Then, it’s a standard sand molding process.
Patterns inside a wooden flask, along runner, ready for sand molding
After bronze pouring
The parts are mirror finished.
Everything about this project : http://www.architecturedudesir.fr/
3kg of bronze (CuSn12) – 1kg of butane gaz – lot of fresh air- a pinch of charcoal…