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Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness. Gauge blocks come in sets of blocks with a range of standard lengths.
A marking gauge, also known as a scratch gauge, [1] is used in woodworking and metalworking to mark out lines for cutting or other operations. [2] The purpose of the gauge is to scribe a line parallel to a reference edge or surface. It is used in joinery and sheetmetal operations.
When he started manufacturing gauge blocks in inch sizes in 1912, Johansson's compromise was to manufacture gauge blocks with a nominal size of 25.4 mm (with a reference temperature of 20 degrees Celsius or 68 degrees Fahrenheit), accurate to within a few parts per million of both official definitions.
A wood scribe is a tool for marking wood by scratching the surface visibly. A wood scribe is often used with a try square for accurate scribing. A marking gauge is a more specific form of wood scribe used to accurately mark wood for cutting, often for laying out mortise and tenon joints.
Gauge block, (also known as a gage block, Johansson gauge, slip gauge, or Jo block) a precision ground and lapped length measuring standard. It is used as a reference for the setting of measuring equipment used in machine shops , such as micrometers , sine bars , calipers , and dial indicators (when used in an inspection role ).
Gauge blocks wrung together and held horizontally. The blocks are held together solely by the adhesion of their extremely flat surfaces, which is so strong that it easily supports their weight. Optical contact bonding is a glueless process whereby two closely conformal surfaces are joined, being held purely by intermolecular forces.
An alternative collet design is one that has several tapered steel blocks (essentially tapered gauge blocks) held in circular position (like the points of a star, or indeed the jaws of a jawed chuck) by a flexible binding medium (typically synthetic or natural rubber). The Jacobs Rubber-Flex brand is a name that most machinists would recognize ...
Moon blocks or jiaobei (also written as jiao bei etc. variants; Chinese: 筊杯 or 珓杯; pinyin: jiǎo bēi; Jyutping: gaau2 bui1), also poe (from Chinese: 桮; Pe̍h-ōe-jī: poe; as used in the term "poe divination"), are wooden divination tools originating from China, which are used in pairs and thrown to seek divine guidance in the form ...