DjuiinoStar Heavy Duty Gyroscope (Solid Stainless Steel Rotor): Initial Speed 8,000 RPM, Sturdy and Stable; Provides Very Good Gaming Experience; High-End Office Toy, Addictive Science Gear DG-5PRO-01

This is a great gyroscope! The mass of its wheel gives it tremendous spend time and great stability. Like all open caged gyroscopes this is prone to damage if dropped on a hard surface. I do not let my young grandchildren play with this because they do not have the dexterity needed to prevent dropping it. I use this and my other open gyroscopes on a plate. I don’t start the gyroscope very high above the plate so if it’s dropped, it doesn’t fall very far. When it lands on the plate, it usually keeps spinning and one can pick it up and set it back on its stand or other objects such as a pencil tip or a taught string. I like this gyroscope a lot!

I got this as a gift for my son, who was studying physics in college. It has a nice weight to it and seems well made. There is no assembly required. There is a small learning curve when wrapping and pulling the string, but once you get the hang of it, it is easy to get a good spin. I don’t know what functional purpose it serves, but it was fun!

I have always wanted one of these and this one is nice. A little pricey but overall works great. The only thing is putting the winding string in the hole. It isn't as easy as it looks in the video. But with a little practice seems to be doing better now. I would recommend this gyroscope as a gift because it is very nice. Has nice weight to it and spins a long. I would give it 4 stars overall.

The DjuiinoStar Heavy Duty Gyroscope is an exceptional STEM toy that combines education with fun. Its solid stainless steel rotor, capable of reaching an impressive 8,000 RPM, offers a hands-on demonstration of physics principles like angular momentum and gyroscopic stability. The toy's sturdy construction ensures durability, making it ideal for both enthusiastic children and curious adults. This gyroscope not only captivates with its high-speed performance but also serves as an engaging tool for learning and exploration in science and engineering.

I have been testing this device for a few days and it has worked reasonably well. Up to this moment I am satisfied with this purchase which I will use for coming lectures on physics at university level. Update: The gyro has been working consistently well. Just one advice, based on my experience, be aware about the little screws that attach the external frame, they get loose after a while and could fall off. In this case it turns useful to have some little screwdriver at hand to reattach them.

The Good: - The metal disc is flawlessly produced, rotates perfectly evenly, and the ball bearings minimize friction - Looks great The Bad: - The thread is hard to pin point even wetted; you will have to cut off end pieces all the time to even have a chance to get the thread through one of the holes. Which means you need a scissor nearby all the time. - Leading the thread through the hole and making sure it doesn't slip back while trying to tightly wrap the thread around the axis is hard even for an adult - While the weight of the disk stores a lot of energy leading to a long rotation time (several minutes for sure, definitely longer than the cheaper models), it's almost impossible to spin this one to the RPM needed for the gyroscope to be simply stable on the provided (very solid!) stand, a thread, or a finger tip. After a dozen tries we have not even once managed to get it to that stage, which is disappointing - the axis always rotates to some extent - The idea of the two holes in the disk is good, but maybe they could be somewhat bigger, and/or provide holes in the axis as well as with the cheaper models - The included instructions are terrible and not very helpful All in all, we think this device is too expensive for the value provided. I had a cheap standard version of a gyroscope thirty years ago already, and it was more stable than this one (it just lost its energy faster)

Sure it costs more than you would expect, but this thing is well designed and well executed. The spindle turns on two tiny ball bearings. The disc is milled. The equatorial hoop of the frame is held in place by four tiny screws. Mine benefited from a little balancing, like you might do on a new fan. I used about 1sq CM of lead tape (for golf clubs). I divided the disc into 90 degree quarters and out the adhesive lead tape in one quadrant and spun the top. Then repeated for the remaining three quadrants. I picked the one quadrant that had the least vibration. Then doubled the weight which didn't help. Then halved the weight which also didn't improve vibration. So for me 1 CM square was best. One tiny drop of break free on each bearing. I spun it up and set on my mouse pad and it ran for 13 minutes and 33 seconds before coming to a stop. You could probably do a better job of balancing, but as it is its pretty amazing.

One of the best gyroscopes I've ever used. I even made one myself in my mechanical engineering undergraduate program years ago, so I understand the precision and effort required to construct a good one. I cannot say for how long the gyro will spin, only because it spins for SO long that I always stop it short. I have yet to let it run its full course. Once you get the gyroscope spinning, you can really tell how powerful the rotor is. It's rotates fast, its heavy, and thus has a lot of angular momentum. Totally worth the price!