Бильярдный стол: устройство и характеристики

Bounded table on which cue sports are played

A billiard table or billiards table is a bounded table on which cue sports are played. In the modern era, all billiards tables (whether for carom billiards, pool, pyramid or snooker) provide a flat surface usually made of quarried slate, that is covered with cloth (usually of a tightly woven worsted wool called baize), and surrounded by vulcanized rubber cushions, with the whole thing elevated above the floor. More specific terms are used for specific sports, such as snooker table and pool table, and different sized billiard balls are used on these table types. An obsolete term is billiard board, used in the 16th and 17th centuries.

Cushions (also sometimes called "rail cushions", "cushion rubber", or rarely "bumpers") are located on the inner sides of a table's wooden There are several different materials and design philosophies associated with cushion rubber. These cushions are made from an elastic material such as vulcanized rubber (gum or synthetic). The purpose of the cushion rubber is to cause the billiard balls to rebound off the rubber while minimizing the loss of kinetic energy. The profile of the rail cushion, which is the cushion's angle in relation to the bed of the table, varies between table types. The standard on American pool tables is the K 66 profile, which as defined by the Billiard Congress of America (BCA) has a base of and a nose height of When installed properly the distance from the nose of the cushion to the covered slate surface is while using a regulation ball set. On a carom table, the K 55 profile is used (with a somewhat sharper angle than pool cushions). K 55 cushions have cloth, usually canvas, vulcanized into the top of the rubber to adjust rebound accuracy and speed. The standard height range of the table, measured from the playing surface to the ground is between 75 and 80 centimetres.

The slate bed of a carom billiards table must have a minimum thickness of 45 millimetres and in tournaments recommended heating temperatures is , which helps to keep moisture out of the cloth to aid the balls rolling and rebounding in a consistent manner, and generally makes a table play faster. A heated table is required under international carom rules and is an especially important requirement for the games of three cushion billiards and artistic billiards. The 7 foot size is also frequently used in North American amateur leagues, and are common coin operated fixtures in bars and other venues. The playing surface for a 7 foot table is .

Pockets, typically rimmed at the back with leather or plastic traditionally have drop pockets, which are small receptacles below each pocket to contain the balls. More modern tables may instead employ ball return pockets, a series of gutters inside the table, which deliver the balls into a collection compartment on one side of the table, in a similar manner to the ball return on a bowling alley. On a coin operated table, the object balls are deposited inside an inaccessible window until the table is paid again, allowing the balls to be released into the compartment, while the cue ball is usually separated into its own ball return, often utilizing a different sized ball. A possible result of drop pockets is that if too many balls go into the same pocket, it would fill up the receptacle and prevent any more balls from going in that pocket, requiring that some be moved out of the pocket manually before shooting again. Regardless of table size, the WPA standard (sometimes informally called "American style") table has wide, angular pockets that funnel notably inward, generally 1.75 to 2.25 times as wide at the opening as the diameter of the balls, wider at the side (middle) pockets than the corners. WEPF pool (sometimes informally called "British style" or "Commonwealth style") is played with balls, and this type of table has smaller, narrow pockets (the width is calculated as the ball diameter multiplied by 1.6, and is consistent at all six pockets), with rounded entrances and nearly parallel sides, like those on a snooker table. One tactical consequence of this design difference is that the jaws of the WPA type pocket are often used exactly like a horizontal version of the backboard of a basketball goal, to rebound the ball into the pocket; this technique does not work on blackball tables, and even shots down the cushion into a corner pocket are more difficult.

For tournament competition under WPA world standardized rules (and league play under derived rulesets), the bed of the pocket billiard table must be made of slate no less than thick. The flatness of the table must be divergent by no greater than lengthwise and across the width. measures 11 feet 8.5 inches by 5 ft 10 in (3569 mm by 1778 mm) with a tolerance of ± 0.5 in (13 mm), though commonly referred to as 12 ft by 6 ft, the nominal outer dimensions including the rails. Smaller tables, approximately 10 ft by 5 ft down to half size, are also sometimes used in pubs, homes and smaller snooker halls. The height from the floor to the top of the cushion is between 2 ft 9.5 in and 2 ft 10.5 in (851 mm and 876 mm). if any, has a strong effect on how easily a ball is accepted by the pocket (the ""). On snooker and English billiards tables, the pocket entries are rounded, while pool tables have sharp "". This affects how accurate shots need to be to get into a pocket, and how fast they can be when not dead on, including shots that run along and against a cushion, making snooker more difficult to play than pool. According to the WPBSA official rule book, "the pocket openings shall conform to the owned and authorised by The World Professional Billiards and Snooker Association (WPBSA)". The organizations do not recognize tournament play or records (maximum breaks, etc.) if not performed on tables that conform to then current templates.

The cushions (sometimes known as rails, though that term properly applies to the wood sections to which the cushions are attached) are usually made of vulcanized rubber.

The area is marked by a drawn on the cloth across the width of the table at from and parallel to the face of the and is covered with baize cloth, traditionally green, though many other colours are now available. The thickness of this cloth determines the table's (lack of friction) and responsiveness to , thicker cloths being longer lasting but slower and less responsive. The nap of the cloth can affect the run of the balls, especially on slower shots and shots played with applied to the A snooker table traditionally has the nap running from the baulk to the top end and is brushed and ironed in this direction.

Other types of billiard tables are used for specific games, such as Russian pyramid which uses a '12 ft by 6 ft' table (similar to a snooker table but with much smaller pockets), and Asian four ball which uses a pocketless 8 ft by 4 ft table. Games such as bagatelle often had more than six holes, including straight through the bed in the middle of the table, a feature still found in bar billiards and bumper pool.

There are novelty billiard tables, often for pool, that come in various shapes including zig zag, circular, and (especially for bumper pool) hexagonal. A circular table featured prominently in the 1972 film Silent Running. For the home market, many manufacturers have produced convertible billiard tables (in the broad sense) that double as dining tables or as table tennis, foosball, or air hockey, tables, with removable hard tops. An electrically heated table is required under international carom billiard tournament rules 'in order to ensure the best possible rolling', although temperatures are not specified. In tournaments, carom billiard tables have recommended heating temperatures of , A disadvantage of synthetic cloth may be that certain types of games, such as balkline, may result in damaging the synthetic cloth too quickly because of the way players hit the balls. The Royal Dutch Billiards Federation's director said in October 2022 that "billiard and snooker localities are simply incapable of affording these energy prices anymore, as heating a billiard costs about 3,500 kilowatts a year ( ). At current energy prices, that is about 2,400 to 2,500 euros a year per billiard table."