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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.
Parallels that have a good surface tolerance can be lightly bonded together by sliding or rotating two parallels together, and the smooth surfaces allows a temporary molecular-attraction to take place - this is known as wringing and is also found with gauge blocks.
Wringing may refer to: Wringing (gauge blocks) , the temporary attachment of gauge blocks to each other Wringer, a device that extracts liquid by action of twisting or squeezing (see: mangle (machine) )
A gauge block is a block of metal or ceramic with two opposing faces ground precisely flat and parallel, a precise distance apart. [31] The length of the path of light in vacuum during a time interval of 1/299,792,458 of a second is embodied in an artefact standard such as a gauge block; this gauge block is then a primary standard which can be ...
The physics of wringing (to the extent that it is understood) is also discussed at gauge block > wringing. I added a cross-reference. — ¾-10 22:16, 23 October 2014 (UTC) Thanks. That is helpful. Of course, the difference here being that flats are usually cleaned very thoroughly and allowed to wring naturally. (Usually, but not always.)
The previous description: "In use, the blocks are stacked end-to-end to make up the desired length." was much clearer. Without that description, the phrase: "...a small number of gauge blocks can be used to create accurate lengths within a wide range", can give a misleading impression. There should be an explicit statement that gauge blocks ...
At multiple points through the video (most notably at the 5:30 mark when drifting into the airport), you can see Block reaching for the paddles mounted on the back of the steering wheel of the 680 ...
[citation needed] This method does not rely other flat reference surfaces or other precision instruments, and thus solves the bootstrapping problem of how to create the first precise flat surface. Up until his introduction of the scraping technique, the same three plate method was employed using polishing techniques, giving less accurate results.