for example, even faceshields 0.8 mm thick made of extrusion polycarbonate sheets can withstand the impact of a 6 mm nominal diameter steel ball traveling at the speed 120 m/s european standard, protection against high-speed particles – medium energy impact , while injection molding faceshields must have at least 1.5 mm thickness to .
the building is supported by 267 columns, each of which rests on a steel ball with a diameter of 5 feet 1.5 m . the ball sits in a concave foundation. if an earthquake occurs, the ground can move up to 20 inches 0.51 m in any direction, as the columns roll on their bases.
ballistic eyewear is a form of glasses or goggles that protect from small projectiles and fragments. for the u.s. military, choices are listed on the authorized protective eyewear list apel . ballistic eyewear including examples that meet apel requirements are commercially available for anyone who wishes to buy it.
like ball mills, grinding steel balls or pebbles are often added to stirred mills to help grind ore, however these mills contain a large screw mounted vertically to lift and grind material. in tower mills, there is no cascading action as in standard grinding mills. stirred mills are also common for mixing quicklime cao into a lime slurry .
a yard globe, also known as a garden globe, gazing ball, lawn ball, garden ball, gazing globe, mirror ball, chrome ball, or orb, is a mirrored sphere typically displayed atop a conical ceramic or wrought iron stand, and sometimes the grass, as a lawn ornament.sizes ranges from 1 in 25 mm up to 10 m 33 ft in diameter, with the most popular gazing ball being 12 in 300 mm .
cartridge, ball, ss109: 5.56×45mm 61-grain 3.95 g semi-WPC-piercing cartridge w/. steel penetrator produced by fabrique nationale. adopted in 1979 as the nato standard. canada. cartridge, ball, c77: 5.56×45mm fn ss109 equivalent used in the c7, c8 and c9 type weapons. made by general dynamics canada.
the typical test uses a 10 mm 0.39 in diameter steel ball as an indenter with a 3,000 kgf 29.42 kn; 6,614 lbf force. for softer materials, a smaller force is used; for harder materials, a tungsten carbide ball is substituted for the steel ball. the indentation is measured and hardness calculated as:
steel grades to classify various steels by their composition and physical properties have been developed by a number of standards organizations. for alloys in general including steel , unified numbering system uns of astm international and the society of automotive engineers sae . american steel grades : aisi/sae steel grades standard.
pétanque french pronunciation: ; occitan: petanca peˈtaŋkɔ is a sport that falls into the category of boules sports, along with raffa, bocce, boule lyonnaise, lawn bowls and crown green bowling.in all of these sports, players or teams play their boules/balls towards a target ball. in pétanque the objective is to score points by having boules closer to the target than your opponent .
the asme b16 standardization of valves flanges, fittings and gaskets committee, which operates under asme’s board on pressure technology codes and standards is responsible for standards covering valves, flanges, pipe fittings, gaskets and valve actuators for use in pressure services.
this standard for cast iron drainage fittings used on self-aerating, one-pipe sovent drainage systems, covers the following: description, sizes and methods for designating openings for reducing fittings, marking, material, pitch, design, dimensions and tolerances, and tests. b16.47- large diameter steel flanges nps 26 through nps 60.