Gyro Exerciser

Gyroscopic exercise tool

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A gyroscopic exercise tool is a device used to exercise the wrist as part of physical therapy or in order to build hand and finger strength. It can also be used as a clever demonstration of some aspects of rotational dynamics. The device consists of a tennis ball-sized plastic or metal shell around a free-spinning mass, which can be started with a short rip string or by a snap of the thumb. Once the gyroscope inside is going fast enough, a person holding the device can accelerate the spinning mass to high revolution rates by moving the wrist in a circular motion.
How it works

A DynaBee gyroscopic wrist exerciser.
The device essentially consists of a spinning mass inside an outer shell. The shell almost completely covers the mass inside, with only a small round opening allowing the gyroscope to be manually started. The spinning mass is fixed to a thin metal axle, each end of which is trapped in a circular, equatorial groove in the outer shell. A lightweight ring with two notches in it for the ends of the axle rests in the groove. This ring can slip in the groove; it holds the spinning gyroscope centered in the shell, preventing the two from coming into contact (which would slow the gyro down), but still allowing the orientation of the axle to change. Once the gyroscope is spinning, tipping the device causes the gyroscope to precess, with its axle slipping around in the groove in a circular fashion. The groove inside the device is a little wider than the axle; an externally applied torque causes one end of the axle to push against the upper rim of the groove, while the other end pushes against the lower rim of the groove. These two effects combine to make the device work: as the gyroscope precesses in response to an external torque, one end of the axle "rolls" along the top edge of the groove while the other end "rolls" along the bottom edge, speeding up the rotation of the spinning mass.
The acceleration of the gyroscope is best when the precession of the gyroscope is followed by wrist motion, so that an accelerating torque is continually applied. The wrist can be rotated either direction (clockwise or counterclockwise)--the result is always to increase the rotation speed. It takes a while before one finds the "rolling" point, but the gyro will also be accelerated to a smaller extent by the slipping friction which occurs if the wrist is rotated too quickly. Since frictional force is essential for the device's operation, the groove must not be lubricated.
Models and manufacturers
Names under which gyroscopic exercise tools are sold include DynaBee and Powerball. DynaBee has been a brand name since the 1970s for gyroscopic wrist exercisers.
Powerball is a trademarked name for gyroscopic exercise devices produced by Nanosecond (NSD). Later patents for the Powerball device cover its extra features such as revolution counters and gyro-powered LED lights. The light-emitting diodes are powered by a small generator embedded in the gyroscope. Even the regular NSD Powerball includes the magnet needed to make the revolution counters work.
Other Powerball models on the market today are the "Powerball 350Hz Metal" and "NSD SuperPowerBall" (these powerballs are made primarily of metal and have twice the weight of "regular" Powerball models and are more challenging to operate since up to 250Nm of torque is produced); the "Powerball Signature" (featuring a more stable rotor)[citation needed] ; and the "Powerball Screamer" (based on the Powerball 250Hz model, but with 8 holes drilled in the rotor to generate a very loud sound).
Nanosecond's Powerball was the first to feature electronic revolution counters and a generator for light-emitting diodes.
Records
Some devices include electronic revolution counters, which allow performance data to be gathered during use.
The current records for 250Hz NSD Powerballs are: 16,732rpm peak, 21,228 revolutions in 90 seconds in Strength mode, and a combined 31,816rpm in the Dual category (one Powerball in each hand).
The peak speed record for the (denser) 350Hz "Metal" Powerball is 14,091rpm.
All of the above records are currently held by Akis Kritsinelis from Greece. For other results, see the official NSD Scoreboard
Patents
The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by P.S.Chuang and 6,942,601 (2001) by P.S. Chuang.
References
^ Article on the dynamics of the device
^ SourceForge revolution counter project
External links
Wikimedia Commons has media related to: Powerball
Powerball International website, Shop
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Dyna-Flex Gyro Exerciser, Blue $21.61 Features of the Dyna-Flex Gyro Exerciser: Aids in the prevention of repetitive strain injuries and carpal tunnel syndrome. Get the edge in golf, tennis, bowling or any sport that requires control and a strong grip. This ultimate executive relaxer is challenging and fun. Improves coordination and builds strength.

Dynaflex Pro Gyro Exerciser $35.04 Dynaflex Regular Pro strengthens your wrists, forearms, etc. Designed with a high performance rotor, which can reach speeds up to 13,000 rpm's and puts out 38 lbs. of torque, it aids in the prevention of repetitive strain injuries and carpel tunnel syndrome. It improves coordination while building strength! The Pro Plus comes with a removable top cap, which allows the insertion of the optional speed meter. When attached to the Pro Plus, the speed meter gives the user the option to have 3 separate working programs through the digital functions: measures the user's current speed, user's highest rpms, and maximum revolutions of the gyro, speed meter sold separately. Size: Small

Dyna-Flex Pro Plus Gyro Exerciser with Computer Balance, Blue $27.41 Features of the Dyna-Flex Pro Plus Gyro Exerciser: Aids in the prevention of repetitive strain injuries and carpal tunnel syndrome. Get the edge in golf, tennis, bowling or any sport that requires control and a strong grip. This ultimate executive relaxer is challenging and fun. Improves coordination and builds strength. Pro Plus Gyro allows for the addition of the speed meter to allow for more exercise functions.

Dynaflex 12000c Powerball Gyro Exerciser Amber $45.57 Few folks could have imagined that a polycarbonate sphere about the size of a tennis ball would change the way people workout and recover from injuries forever. But that s exactly what happened with the incredible popularity of the patented Dynaflex Gyro. As a result Dynaflex International has gone on to established itself as a leader and innovator of fitness products. Whether you re a weekend athleteor simply want to improve the way you look and feelthe Dynaflex lineup of exercise gyros represent the fitness breakthrough you ve been looking for So small they go anywhere. Yet so powerful you ll SEE and FEEL tremendous results in minutes a dayThe Powerball generates 35 lbs of torque with speeds up to 13 000 RPM. The faster the unit runs the brighter the lights will be until the whole hand is engulfed in a bright glow. Just when you think you ve seen it all along comes the ultimate hand wrist and arm exerciser.

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Pro Plus Gyro Exerciser with Computer Balance $24.31 PLEASE NOTE: THIS ITEM CANNOT SHIP VIA 3-DAY DELIVERY.Aids in the prevention of repetitive strain injuries and carpal tunnel syndromeGet the edge in golf, tennis, bowling or any sport that requires control and a strong gripThis ultimate executive relaxer is challenging and funImproves coordination and builds strength

Dyna-Flex Speed Meter for Pro Plus Gyro Exerciser $26.99 This Speed Meter has 3 important functions:1) Measures the users current speed.2) Remembers the users highest rpm.3) Calculates the maximum revolutions of the gyro.The Speed Meter is designed to work with the Dynaflex Pro Plus and Powerball gyros. It easily adapts to each unit by simply removing the cap of the gyro and snapping the meter into place.The Speed Meter will upgrade either unit to the ultimate performance machine. Attach the Speed Meter then challenge yourself or your friends and see who can achieve the highest speeds! It is also a great tool that will help you keep track of your progress more precisely.

Planet Waves Dynaflex - Pro Exerciser Ball with Dock $44.99 The Dynaflex from Planet Waves is an essential hand and arm strengthening tool for all musicians looking to achieve a competitive edge during practice and/or performance. With the Dynaflex, you get an all-in-one tool that will exercise and condition hands, wrists, and forearms while increasing hand speed, coordination, and improving endurance. Perfect for anyone who uses their hands—from guitar hand conditioning to drummers and even massage therapists and typists—the hand-held exercise ball has an internal Gyro Roto and users can start the Dynaflex with either the ripcord or the automatic starter. Then simply move the ball in a back-and-forth motion to increase the speed of the Gyro. Working the Dynaflex all the way up to 13,000 RPM improves coordination and builds strength and endurance in the hands, wrist, and forearms. The unique gyroscope motion helps to build rhythm and lead chops, plus it stimulates muscles, joints, and tendons. Planet Waves Product Specialist, Rob Cunningham says it's "like a mini-gym to strengthen your hands, wrists, and forearms. The Dynaflex is a great on-the-go arm and hand conditioning tool. Use it in conjunction with Planet Waves' Varigrip hand and finger exerciser for total finger, hand, wrist and arm fitness!" So it doesn't roll away when not in use, included with the Dynaflex exercise ball is a handy docking base.

Planet Waves Dynaflex - Pro Exerciser Ball With Dock $44.99 The Dynaflex from Planet Waves is an essential hand and arm strengthening tool for all musicians looking to achieve a competitive edge during practice and/or performance. With the Dynaflex, you get an all-in-one tool that will exercise and condition hands, wrists, and forearms while increasing hand speed, coordination, and improving endurance.Perfect for anyone who uses their handsfrom guitar hand conditioning to drummers and even massage therapists and typiststhe hand-held exercise ball has an internal Gyro Roto and users can start the Dynaflex with either the ripcord or the automatic starter. Then simply move the ball in a back-and-forth motion to increase the speed of the Gyro. Working the Dynaflex all the way up to 13,000 RPM improves coordination and builds strength and endurance in the hands, wrist, and forearms. The unique gyroscope motion helps to build rhythm and lead chops, plus it stimulates muscles, joints, and tendons.Planet Waves Product Specialist, Rob Cunningham says it's "like a mini-gym to strengthen your hands, wrists, and forearms. The Dynaflex is a great on-the-go arm and hand conditioning tool. Use it in conjunction with Planet Waves' Varigrip hand and finger exerciser for total finger, hand, wrist and arm fitness!"So it doesn't roll away when not in use, included with the Dynaflex exercise ball is a handy docking base.

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Gyro $28 "By Tomer Yariv. For multi-percussion duet (2 sets of the following instrumentation: 22"" bass drum, 4 toms (8"", 10"", 13"", 14""), bongos, hi-hat, splash cymbal, cow bell, wood block). Level 5. Score and set of parts. Composed 2009. Published by Innovative Percussion"

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Electronic Abdominal Exerciser Belt $9.6 Item: Electronic Abdominal Exerciser BeltWeight: 500gDimension: 300*200*50 mm

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