Tumbling


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tumbling

[′təm·bliŋ]
(aerospace engineering)
An attitude situation in which the vehicle continues on its flight, but turns end over end about its center of mass.
(engineering)
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.

Tumbling

 

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.

D. I. BRASLAVSKII and V. M. RASKATOV

barreling, tumbling

The application of paint to small articles by tumbling them in a barrel containing paint.
References in classic literature ?
The ship laboured without intermission amongst the black hills of water, paying with this hard tumbling the price of her life.
The Dual Tumbling Composter is the first to offer two compartments, enabling easier and more efficient composting.
DEERNESS Gymnastics Academy tumblers returned from the British Tumbling Championships with a national champion - and a further four silver medals and a bronze.
The marination process is mostly complemented with tumbling technology (Pietrasik and Shand, 2003).
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After tumbling many times, car hardly stopped by hitting the trees.
REDCAR Gymnastics Club's boys' tumbling squad entered a team of 12 to the North of England NDP Tumbling Grades Competition at Hartlepool and achieved some excellent results across different ages and levels.
Contract notice: supply of equipment for tumbling and press with pressure min.
La gymnastique algerienne (garcons et filles en seniors et en juniors, dans les trois specialites, trampoline, tumbling et aerobic, continue de dominer le continent africain.
For example, if cheerleading is a big part of the community, The Tumble Gym will cater by offering tumbling and cheerleading classes.
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.