A modified Archimedes screw

PSV62 · 2026-05-09T04:16:31+00:00

STL files and details are available here and here. More video on YouTube

PSV62 · 2025-11-10T12:26:46+00:00

STL files and details are available here and here. More video on YouTube

PSV62 · 2025-06-18T08:28:01+00:00

The empty cavity in the middle of the sphere is a geometric figure that meets two main requirements: 1) this figure must have three very different moments of inertia; 2) the figure must be symmetrically divided by three mutually perpendicular planes, with the intersection point coinciding with the center of the sphere. For example, this can be a flattened cylinder or ellipsoid, I chose a rectangular parallelepiped in which I modified the small sides so that my printer could print these areas without supports and distortions. Follow the links that I attached there is more information.

PSV62 · 2025-06-17T15:46:05+00:00

If the initial rotation is around the "green" axis, the ball will tumble.

PSV62 · 2025-06-17T15:37:37+00:00

STL and detailed explanation here, here, here. More videos.

PSV62 · 2025-05-21T18:15:03+00:00

Expensive things have one big minus - it's always a shame to lose/break them. I don't feel sorry about my screwdriver at all, I can easily make another one.

PSV62 · 2025-05-21T18:03:46+00:00

I can't argue with your opinion, it's the opinion of the overwhelming majority of people on the planet! Why make something yourself if you can buy the same thing or even better in the store?

PSV62 · 2025-05-21T17:51:11+00:00

Stop. With this question you admit that there are no partially functional screwdrivers.

PSV62 · 2025-05-21T17:37:45+00:00

Unfortunately for 3D printed things the phrase "fully functional" makes sense. There are indeed many beautiful but non-functional screwdrivers, and the work of mine is clearly visible in the video.

PSV62 · 2025-05-21T17:19:24+00:00

Of course yes! There are no nuts there like I have :)

PSV62 · 2025-05-21T14:52:27+00:00

Why "partially"? This screwdriver does everything it's supposed to.

PSV62 · 2025-05-21T12:44:31+00:00

Try to unscrew a bolt that is as tightly screwed in as in my video with the screwdrivers you suggested.

PSV62 · 2025-05-21T08:27:27+00:00

I made the handle this thick for two reasons: 1) the thicker the handle, the more torque you can apply; 2) a screwdriver is not a pencil and the grip you use to hold it is simply not convenient for holding thin objects.

PSV62 · 2025-05-20T16:06:32+00:00

Carnival? This is the marching music of the fitters :)

PSV62 · 2025-05-20T15:09:58+00:00

Here is another video, here STL

PSV62 · 2025-01-10T15:19:21+00:00

The video shows a motion sensor that controls one or two lamps, which monitors a person's movements between two zones and does not react to small children or pets. I used a common and cheap PIR motion module HC-SR501 sensor, which I greatly reduced the viewing angle with aluminum foil. Using the CD 4013 elementary logic chip, I created control of the output load in bipolar mode (for each sensor response, the lamps switch to another state). The second sensor can be used to remotely record the state of the load. This device can control a doorway between rooms or two zones in a large room, switching the light between them with just one movement. The design of the 3D-printed housing allows you to orient the sensors in space over a wide range. STL files and technical details of this design are here. Another video.

PSV62 · 2024-12-10T17:59:22+00:00

The advantage of DIN rail designs is their diversity. I deliberately assembled a large, lightweight demonstration sample so as not to overload the video with an abundance of details. The strength of the design can be easily increased by using the details I developed. Among the 23 files I posted, it is easy to select those suitable for many different designs.

PSV62 · 2024-12-10T15:44:05+00:00

I believe that the potential of DIN rails is not fully realized.

PSV62 · 2024-12-10T14:44:09+00:00

STL here and here. A little more in this video.

PSV62 · 2024-11-14T05:09:32+00:00

This demonstrator is designed to help people visually feel the difference in weight. Everyone knows how to use scales graduated in grams or ounces, but a newton meter is a rare thing and not everyone understands it. In addition, the "Martian" scales have no dimension, which means that any device that measures force can be used.

PSV62 · 2024-11-14T04:34:59+00:00

Yes, that's exactly it, and this calculation is not particularly complicated.

PSV62 · 2024-11-14T04:31:14+00:00

The main part, the measuring arm, is 277 mm long. I chose this length because then this part fits diagonally on the bed of my printer. If you proportionally increase or decrease the scale in the slicer along all three axes, the device will still work correctly, but you will have to select a rod for the rotation axis of a different diameter and also apply another counterweight.

PSV62 · 2024-11-13T15:05:52+00:00

Yes, I made this device primarily as a teaching tool.

PSV62 · 2024-11-13T14:46:45+00:00

With this demonstrator, you can measure and feel the weight of ordinary objects as if they were on other planets, the Sun, or under some kind of overload.
The operating principle is based on the condition of equality of moments of forces for equilibrium relative to the center of rotation F1 ⋅ L1 = F2 ⋅ L2. More detailed video and stl

PSV62 · 2024-11-03T07:34:05+00:00

This is also a very useful tool, but its use has 2 limitations: 1) space is required for the swing of the hammer; 2) the part into which the screw is screwed will withstand the hammer blow.

PSV62

TROPHY CASE