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UNIVERSAL PLATE [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2008-05-28

English

Subject field(s)
  • Machine-Tooling (Metallurgy)
  • Automatic Control (Machine Tools)
CONT

The Stewart platform consists of two plates connected by six mobile and extensible legs. The lower or base plate is immobile. The upper or mobile plate has six degrees of freedom, three rotational and three translational. The platform is highly stable and easy to control. The platform's six legs each have two parts, an upper and a lower leg, with a piston-like cylindrical DoF between each pair of parts. The legs are connected to the base plate and the top plate by universal joints at each end of each leg.(These universals are not just sets of abstract DoFs. Each also contains a spider-like body, while also having two DoFs.) The upper part of each leg can slide into and out of the lower leg, allowing each leg to be varied in length. The position and orientation of the mobile platform(top plate) varies depending on the lengths to which the six legs are separately adjusted. Once the top is connected to the legs, the entire Stewart platform assembly has 36 DoFs. Only six DoFs are independent, the same as the top plate would have if it were disconnected. You can think of these independent DoFs as the six adjustable leg lengths or as equivalent to the six DoFs of the mobile plate.

OBS

Geodetic Technology trademarked "hexapod" for a Stewart platform in a machine tool context. However, apparently this has not stopped other machine tool manufacturers from using the term. A Free CNC software package, the Enhanced Machine Controller (EMC) [1] is capable of driving a stewart platform using standard G-codes such as used for milling machines, etc.

French

Domaine(s)
  • Usinage (Métallurgie)
  • Commandes automatiques (Machines-outils)
CONT

La plateforme de Stewart [...] est un type de robot parallèle constitué de six actionneurs. Elle a six degrés de liberté : les trois coordonnées de translation ainsi que les angles de tangage, roulement et lacet (Angles d'Euler). Les six jambes sont actionnées pour changer de longueur et [faire] varier l'orientation de la plateforme [...]

OBS

Les plateformes de Stewart ont des applications dans la technologie des machine-outils et des grue, la recherche sous-marine, la simulation de vol, les antennes paraboliques, les télescopes et la chirurgie orthopédique.

Spanish

Save record 1

Record 2 2008-02-27

English

Subject field(s)
  • Pumps
  • Aircraft Systems
CONT

In this pump, the pistons are at an angle to the drive shaft and thrust plate. The piston block shaft is connected to the drive shaft by a universal joint... The drive shaft, thrust plate, piston block shaft, and piston block all revolve. The connecting rods are attached to the thrust plate and revolve with it, unlike the swash plate pump where the piston rods slide past a stationary swash plate.

French

Domaine(s)
  • Pompes
  • Circuits des aéronefs
OBS

Pompe à pistons.

OBS

plaque de poussée : terme uniformisé par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Maintenance.

Spanish

Save record 2

Record 3 2000-09-27

English

Subject field(s)
  • Metal Rolling
  • Metallurgy - General
CONT

A "universal plate" or "wide flat" is a flat product hot rolled on its four surfaces(or in closed passes) [which distinguishes it from "plate"].

OBS

universal mill plate : A product rolled in a "universal mill"(see that record).

French

Domaine(s)
  • Laminage (Métallurgie)
  • Métallurgie générale
CONT

[Les] produits plats laminés à chaud [...] comprennent : Le large plat : produit plat de largeur supérieure à 150 mm et d'épaisseur en général supérieure à 4 mm, toujours livré à plat, c'est-à-dire non enroulé et faisant l'objet de spécifications particulières concernant les arêtes qui doivent être vives; le large-plat est laminé à chaud sur les 4 faces (ou en cannelure fermées) [ce qui le distingue de la tôle] ou obtenu par découpage ou oxycoupage de produits plats plus larges, à condition que les tolérances fixées pour les larges-plats soient respectées.

OBS

Le laminage sur les quatre faces est réalisé dans un «laminoir universel», appelé aussi «train universel» (voir cette fiche).

Spanish

Save record 3

Record 4 1999-03-04

English

Subject field(s)
  • Analytical Chemistry
DEF

A zone in paper and thin-layer chromatography of approximately circular appearance.

CONT

The detection of spots is sometimes easier than with paper chromatography because more universal techniques can be used. Frequently, colorless or nonfluorescent spots can be visualized by exposing the developed plate to iodine vapor. The iodine vapor interacts with the sample components, either chemically or by solubility, to produce a color. Thin-layer plates and sheets are commercially available which incorporate a fluorescent dye in the powdered adsorbent. When held under ultraviolet light, dark spots appear where sample spots occur due to quenching of the plate fluorescence.

PHR

Colorless, nonfluorescent spot.

French

Domaine(s)
  • Chimie analytique
DEF

En chromatographie sur papier ou sur couche mince, zone d'apparence circulaire ou ovale.

PHR

Étalement de tache.

Spanish

Save record 4

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