ettis.at – Page 2 – The Ettis home page

2020-01-042023-05-07

Weinuntersetzer (Fortsetzung)

Dies ist die Fortsetzung von dem Weinuntersetzer-Blogpost, wo die Herstellung von zwei Weinglasuntersetzern aus Leder gezeigt wurde. Ein Jahr später sollte ein passender Untersetzer für die Weinflasche hinzukommen.

2019-12-252020-01-03

Lederköcher

Zu einem selbstgebauten Primitivbogen gehören nicht nur die passende Pfeile, sondern auch ein stilvoller Köcher. Für eine ganz besondere Person wird ein ganz besonderer Köcher gebaut, der ca. 6-8 Pfeile fassen soll.

2019-11-262020-01-06

Bowl Feeder: First Prototype!

Good news! The first prototype of my bowl feeder is ready! Finally I can do some tests and see how the mechanics are working!

It was an exciting moment to switch on the vibration for the first time, and to slowly increase the amplitude and try different frequencies. Unfortunately, the result was slightly disappointing: nothing happened.

2019-11-132019-11-17

Bowl Feeder Control Circuit

The bowl feeder needs to vibrate with just the right frequency and amplitude in order to move the beads the optimal way. Since I don’t know the optimal parameters yet, I want to make a control circuit that allows me to tune frequency and amplitude of the vibration. In more technical terms this means I need two control knobs, two displays and a microcontroller for generating a PWM signal.

2019-11-092019-11-11

Ziehmesser-Tasche

Bei diversen Holzarbeiten (z.B. beim Bogenbau) verwende ich ein superscharfes Ziehmesser (oft auch als Zugmesser, Zieheisen oder Reifmesser bezeichnet). Um die Klinge (und natürlich auch meine Finger) zu schützen, baue ich nun eine Lederhülle!

2019-09-192019-10-20

3D Printing

Now that I have finished designing the bowl feeder, it’s the time to get it 3d-printed. I never intended to 3d-print it myself, this would be similar to making printed-circuit boards (PCBs) myself: It would be a huge project of its own and there are companies out there, who offer professional quality at a very good price. But still, one has to understand the challenges of 3d-printing in order to avoid common pitfalls in designing the model.

So I searched the Internet for a suitable printing-service provider. I found https://all3dp.com/, who submit your model to different providers and show you the providers with the best price vs. the shortest delivery time. Both parts, the bowl and the base cost me less than 20€ each incl. shipping and VAT.

2019-09-082019-11-09

Learn professional CAD software

A bowl feeder consists of more than just the bowl: It needs a stand and, most importantly, some kind of suspension to allow it to vibrate as needed. When planning the next steps, I quickly realized TinkerCAD will not be the best tool to support me with these things. When I discussed my project with a professional, he recommended Autodesk Fusion 360. He also pointed out there is a free license for hobbyists and start-ups (thanks Florian!). Since one of the goals of this project is to learn new technologies, I thought I should learn them with the proper software. So that’s why I decided to work into Fusion 360.

2019-07-202019-11-09

Programming a spiral

As I wrote in my previous post, I decided to program a Custom Shape Generator in Tinkercad in order to be able to generate every detail of my bowl feeder just as I want it to be. I spent my two weeks summer vacation in Italy thinking about sine and cosine, vectors and loops. I implemented the JavaScript code on my cellphone, although characters such as the square brackets [] were a challenge and I needed to install a special Android keyboard app for these. When coming back from Italy it was almost finished, only a few minor details needed to be fixed.

2019-07-042019-11-09

Designing a Bowl Feeder

Bowl Feeders are used very often in industry when a bulk load of pieces must be separated into single pieces. They consist of a bowl with a spiral ramp on the inside. The bowl is vibrated around its center in a way that each point of the ramp vibrates horizontally and vertically, e.g. in a small circle. This will cause parts on the ramp to be thrown forward a little on each vibration.

Each bowl feeder must be made specifically for the goods it should process, mainly for the pieces’ physical dimensions. This is the reason why I want to 3d-print my bowl. 3d-printing is quick and if a tiny detail doesn’t fit, I can cheaply make a new one.

2019-06-192019-11-09

A new project idea!

As chance would have it, I find myself with a lot of spare time over the summer. This screams for a new project! Recently, I have made a list of skills I already possess and skills I would like to learn. So the project that I choose should help me learn a few of these.

After a lot of thinking I came up with the following: I want to make a machine that sorts my perler beads for me!