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(aerospace engineering)
An attitude situation in which the vehicle continues on its flight, but turns end over end about its center of mass.
A surface-finishing operation for small articles in which irregularities are removed or surfaces are polished by tumbling them together in a barrel, along with wooden pegs, sawdust, and polishing compounds.
(mechanical engineering)
Loss of control in a two-frame free gyroscope, occurring when both frames of reference become coplanar.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the process of removing burrs, scale, molding sand, and corrosion from the metal surfaces of small blanks and parts and for improving the surface quality of articles (polishing). It is performed in drums. To speed up the process, abrasive materials such as sand, emery, or corundum are put in the drum (dry tumbling), or sometimes various solvents are added (wet tumbling). For polishing in drums, sawdust or leather cuttings are sometimes put in with the objects being polished (dry polishing), or solutions of soap or alkali are added (wet polishing). Eccentrically mounted drums are used for better mixing.

In vibration tumbling the working chamber is oscillated in various directions with a frequency of 15-50 cycles per second; the vibration provides complex mixing of the parts and abrasive particles. When fastened to the drum, large parts may be treated by vibration tumbling.

In hydraulic tumbling, cold surface hardening takes place, increasing the fatigue resistance of the parts being treated. In this process the parts are fastened inside a chamber within which a liquid containing small metal shot is moving.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

barreling, tumbling

The application of paint to small articles by tumbling them in a barrel containing paint.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

cryptocurrency tumbler

A service that mixes a cryptocurrency transaction with other transactions to eliminate the possibility of someone discovering the party that originated them. The cryptocurrency blockchain is a public record, and with the proper analysis tools, a sender's wallet can be uncovered and ultimately reveal the owner's name. If a sender is afraid of being identified when sending Bitcoins or some other crypto token, a tumbler service can be used.

Also called "cryptocurrency mixing," the tumbler service functions like a VPN, which hides the sending address from the receiving party. The coins are sent to the tumbler service, and the service relays the transaction hiding the sender's address. The amount of coins may also be split up to further randomize the transaction, and the tumbler takes a fee like a foreign currency exchange. See cryptocurrency and VPN.
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References in periodicals archive ?
Sam and Jacob qualified for this competition by competing at the Regional National Development Plan Tumbling competition in April at Durham City Gym club and then the British Regional Team and British championship semi-finals in June 2019 at the Birmingham Arena, Birmingham.
Wharton is a national junior coach in tumbling for British Gymnastics and also developed all of the tumbling activities at Deerness Gymnastics Academy between 2005 and 2016 before it outgrew the club and DCGC was set up.
Trend presents breathtaking moments of the first day of the World Cup in Trampoline and Tumbling.
Kallum Mulhall started tumbling in 2013 and had a very successful junior career winning three bronze World Age Group medals in 2013-15.
A pupil at Netherthong Junior School, Carey has been tumbling since the age of three and is a member of the Diamonds Gymnastics Club in Halifax.
Eight experimental treatments were formulated to contain two tumbling marination methods (vacuum continuous tumbling marination, CT; vacuum intermittent tumbling marination, IT) and four effective tumbling times (4, 6, 8, and 10 h).
-Var of tumbling car hardly stopped after hit the trees
En prevision de la CAN-2014 en Namibie (26 avril-2 mai), les selections algeriennes de gymnastique (trampoline, aerobic et tumbling) effectuent leur preparation jusqu'au 24 avril.
The gymnasts who attend The Tumble Gym have the opportunity to do recreational gymnastics, tumbling, birthday parties, or play openly.
Today I was driving on the Sheikh Mohammed Bin Zayed Road towards Sharjah, just before exit 44 (Al Ain Road Exit) when I noticed something tumbling towards me on the road.
The Defense Advanced Research Projects Agency is working with researchers around the world--including high schoolers--to solve the problem of synchronizing the movements of tumbling objects in space.