Automated Pixel Art With Marbles

October 6, 2024 by Danie Conradie 2 Comments

Marble machines are a fun and challenging reason to do engineering for the sake of engineering. [Engineezy] adds some color to the theme, building a machine to create 16×16 marble images automatically. (Video embedded below.)

The core problem was devising ways to sort, lift, place, and dump marbles in their correct positions without losing their marbles—figuratively and literally. Starting with color detection, [Engineezy] used an RGB color sensor and Euclidian math to determine each marble’s color. After trying several different mechanical sorting mechanisms, he settled on a solenoid and servo-actuated dump tube to drop the marble into the appropriate hopper.

After sorting, he faced challenges with designing a mechanism to transport marbles from the bottom hoppers to the top of the machine. While paddle wheels seemed promising at first, they tended to jam—a problem solved by innovating with Archimedes screws that move marbles up smoothly without clogs. The marbles are pushed into clear tubes on either side of the machine, providing a clear view of their parade to the top.

Perhaps most ingenious is his use of constant-force springs as a flexible funnel to guide the marbles to a moving slider that drops them into the correct column of the display. When a picture is complete, sliding doors open on the bottom of the columns, dumping the marbles into a chain lift which feeds them into the sorting section. Each of the mechanisms has a mirrored version of the other side, so the left and right halves of the display operate independently.

The final product is slow, satisfying and noisy kinetic testament to [Engineezy]’s perseverance through countless iterations and hiccups.

Marble machines can range from minimalist to ultra-complex musical monstrosities, but never fail to tickle our engineering minds. Continue reading “Automated Pixel Art With Marbles” →

Dispense 60 Bolts In 2.3 Seconds

March 21, 2023 by Michael Shaub 26 Comments

We’ve covered a number of projects that assist makers who need to fill orders for their small businesses, or kitting. [Helmke] has sorted thousands of pieces of hardware that they include with 3D printed parts sold online. They have been developing an alternative, a modular system for sorting and packaging specific quantities of parts.

After the break, check out the latest video from their small but growing channel for a very clear walk-through of the counting system they’ve been iterating on. The 2nd video in the series explores solenoids, Geneva drives, and ultimately a sprocket to dispense a variable number of bolts from the sorting machine. The approach gives consistent results, easily to vary quantities, and is fast! These videos are also rich with lots of small details you might want to explore on your own like magnetic part feeding, discussions of different sensors for detecting and counting parts, 3D printed gear box designs, and we love the use of stackable crates for project enclosures.

We hope to see more videos from [Helmke] in the series as the project matures for deeper dives into the existing mechanisms and new features they develop next. Hungry for more? We’ve brought you everything from cutting and stripping wire, to SMD tape, to resistors, to laser-cut parts. Continue reading “Dispense 60 Bolts In 2.3 Seconds” →

This Light-Up Sorter Is A Bright Idea

February 12, 2019 by Kristina Panos 14 Comments

Sorting out a mountain of screws and other workbench detritus by hand is a task that only appeals to a select few of us. [AdrienR] is not one of those people. He believes the job is better suited to a robot, so he built an intelligent and good-looking machine that does just that.

[Adrien]’s sorting bot is capable of organizing a hodgepodge of parts quickly and effectively. He simply scatters the parts on the light box work surface, illuminates it, and takes a picture with a downward-facing web cam. An algorithm studies the parts and their positions using OpenCV image processing, and sends the triangulation back to the arm so it can pick and place the parts into laser cut boxes using a home brew electromagnet.

[Adrien] calls this a work in progress. He plans to control it with a Raspberry Pi so it can be a standalone unit, and will probably move the parts boxes to the outside curve. Drop yourself past the break to see it sort.

If delta robots are more your sort, this one has balls. Colored balls.

Continue reading “This Light-Up Sorter Is A Bright Idea” →

Delta Robot Is Sorting Golf Balls And Taking Names

January 9, 2019 by Lewin Day 15 Comments

It’s a common situation faced by every hard-working American – you get home after a long day at the calcium mines, and find yourself stuck with a pile of colored golf balls that simply aren’t going to sort themselves. Finally, you can put away your sorting funnels and ball-handling gloves – [Anthony] has the solution.

That’s right – it’s a delta robot, tasked with the job of sorting golf balls by color. A Pixy2 object tracking camera is used to survey the table, with the delta arms twitching around to allow the camera to get an unobstructed view. Once the position of the balls is known, a bubble sort is run and the balls rearranged into their correct color order.

[Anthony] readily admits the bubble sort is very inefficient at this task; it was an intentional choice so it could be later compared with other sorting methods. [Anthony] also goes into detail, sharing the development process of the suction gripper as well as discussing damping methods to reduce noise.

Delta machines are always fun to watch, and are a good choice for sorting machines. We’ve seen some really tiny ones, too. Video after the break.

Continue reading “Delta Robot Is Sorting Golf Balls And Taking Names” →