Gallery
I'm Toon Jorna, 24 years old, that's me in France on the right. I have studied mechanical engineering at the NHL Stenden in Leeuwarden. Right now I'm pursuing a masters in materials science and engineering at TU Delft. Within the extremely broad field of materials I'm focussing on application of materials in engineering applications.
In my spare time I like to create technical tools, visually appealing objects and learn about new subjects. I have had several hobbies and projects varying from forging and casting to learning Norwegian (Bokmål).
Norway is in (my opinion) one of the most beautiful countries in the world and the only place in the world I would consider leaving the Netherlands for.
Below follows a showcase of everything I've made through the years, I hope the extensive use of photo's gives a better idea of my interests and abilities than a simple list of topics.
Many of the projects shown below are made with the help of my brother Maarten Jorna.
Everything is sorted by subject not by date.
For more information, please email me on ahjorna@gmail.com
On the right my homemade forge. On the left my attempt to make a small simple forge with a good efficiency. This was made as a higschool design project.
Various forged items. The firestriker is made from an old file. The chissel is made of two layers: C45 (carbon steel) and S235 (construction steel)
Forging layered steel "damast" from tool steel (C45) and construction steel (S235).
Above the creation of a short bow made of Yew. The yew bow doesn't have a perfect tiler but it works. To the right the Bow from Yew and another one from hickory.
Aluminium anodizing and electrochemical etching of steel. Hopefully I get around adding ECM (Electro Chemical Machining) to this list of interesting electrochemical processes.
hexagonal 2D crystal structure made of soapbubbles, easy experiment to visualize what close packed planes of atoms in crystals look like.
Ideas from metal science we can see with this experiment: vacancies, dislocations, high and low angle grain boundaries. On the right a screenshot of the pattern formed when zooming out on a digital screen. The bubles interfere with the pattern of the screen (moiré pattern) this helps visualizing that different grains have a different orientation. (at least I think that's what's going on I didn't think too long about this)
Creating a gas oven to melt bronze and aluminium. On the left a first test to see the effect of throttling the air supply.
First attempt at a bronze sword/dagger, more accuruate wooden sword based on a picture from the british museum (exact source lost), During the first attempt at casting the sword didn't completely fill.
At the second attempt the sword filled completely but the mold making process was still difficult. The wooden sword was cut in half and glued on a flat piece of wood. This should improve the stifness of the template.
At this point there are so many failed attempts at bronze swords laying around that I soon will have to start remelting them. My next attempt will be using a thinly ground sword Where the porosity is filled with solder. This is probably more historicly accurate considering nobody had powertools 2000 B.C. I hope this will also prevent some porosity.
Edit: This didn't work out and this project has been abbondoned as I feel like the amount of effort it would take to find out what's going wrong is not worth it.
Aluminum gears, aluminium prototype parts for a solar boat gearbox (DB-20 solar boat racing).
Clamp for a universal testing machine (long time project just starting). Wasn't happy with my initial design (red) and a friend offered to 3D print a new molding plug for me so I went all out on fancy round shapes.
3D printed mechanical logic gates. The idea was to use printing in place to make make an adder with minimal manual assembling work. On the left top, the clocked logic gates used for the adder prototype (XNOR and AND gate).
On the right the Mechanical adder The complete adder is around 150x150mm and consists of 3 XNOR gates gates, 2 AND gates and a NOT gate. The sum and carry output should be read inverted. Note that the carry out is placed such that it directly connects to the next layer if another full adder was stacked on top.
Next steps for this project are: creating a first layer adder with a fixed carry in and adding a soft lock on the inputs so they cannot be pushed back by the flexures in the logic gates.
The logic gates shown on the bottom left are 3D printed versions of normal (not clocked) mechanical logic gates. (OR, NOT and AND).
The Corona pandemic gave me time to explore new interests like drawing.
On the left a portrait of questionable quality based on starwars lead Rey (Daisy ridley). On the right a full scale drawing of Rey I plan on using as a wall poster
Attempt to copy the artstyle of Sam Yang (samdoesarts on social media) from left to right the first picture contains sketches directly copied from his work, the second picture is a complete grey scale copy of one of his drawings.
Left, traced picture from alita battle angle I coloured it using only full black (and black dot patterns). This drawing was made for a screenprinting course. On the right a colour speedpaint of a monk sitting underneath a tree.
Sand sculpting of a hand
Tiny wax head. Pretty happy with the way it turned out.
large wax face. one side of the face is made in large planes while the other side is completly smooth. This was face was made solely for the purpose of practice and I have learned a lot from this exercise.
Eye see what this is.
How not to lost wax cast. It turns out that when casting in plaster you're suposed to remove all moisture from the mold before pouring the bronze. This takes several hours at around 700°C.
Lost wax casting is on hold untill I have easy acces to an electric kiln.
Minecraft creations
Left spaceship made for a comunity contest from the Planet minecraft website, right original alien face idea
Left Davy Jones from pirates of the caribbean movies, right monks carving the rock based on paintings from Rob Gonsalves.
Original fantasy city concept, city build inside a very large waterweel.
