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 periodicals archive ?
Bilal Gurbanov, who competed in tumbling competitions among gymnasts aged 11-12, won the bronze medal scoring 59,800 points.
Our modeling of this body suggests the tumbling will last for many billions of years to hundreds of billions of years before internal stresses cause it to rotate normally again," researcher Wes Fraser said in a statement from (https://www.
Kallum Mulhall started tumbling in 2013 and had a very successful junior career winning three bronze World Age Group medals in 2013-15.
Representing the North of England Tumbling Squad in Birmingham, Ben Gatenby (NDP 2), Christopher Martin (NDP 5) and Sam King (NDP 4) qualified for July's finals with two gold medals and a seventh place finish, respectively.
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.
Glen Wharton, head of tumbling at Durham-based Deerness, said: "This is a great time for our tumblers and the whole club.
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
Contract notice: supply of equipment for tumbling and press with pressure min.
La selection algerienne de trampoline etait en regroupement du 29 mars au 8 avril a Antibes (France), alors que celle du tumbling se trouve, depuis le 30 mars, a Chenove (France) jusqu'a vendredi dernier.
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.