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A quarter has 119 grooves, or reeds. The grooves are used as an anti-counterfeiting strategy.
There are many different types of beetles with grooved backs, and they use them for different purposes. In some diving beetles, for example, the grooves aid in their swimming ability. Some desert dwellers such as species of Tenebrionidae beetles use the grooves to collect moisture.
It dates back to the late 18th and early 19th centuries when mechanical presses were used. The number of grooves was chosen based partly on how easy it was to create dies for those denominations.
I used a small screwdriver to turn the whole back plate counterclockwise. There are six grooves on the back plate. Just pick one and turn it with the screwdriver.
Used with a router to make detail grooves, normally round bottomed.
A chisel
A Granton Edge or kullenschiff edge
It is called a Die. It looks like a nut that is used on a bolt. It is made from much harder steel and cuts the grooves in the pipe like the thread on a bolt. The same thing is used to cut the grooves on a bolt, a different size one for each size of pipe or bolt.
I think it's what they used back then for "again" ----
The fullers (grooves) on knives are primarily to reduce weight without reducing strenght. They are mainly for larger blades. Many people refers to these grooves as "blood grooves"..that term is not correct and displays a incorrect view of the purpose of the knife as most are not designed to be used as weapons. The correct term is fuller.
Splines are parallel grooves on the side of a shaft that engage with matching grooves in a socket. They allow power to be transmitted between two rotating elements. Splines are used on axles to allow them to be removed and replaced.
i don't think you can because i tryed to get my magic beans back when i did that and i couldn't get them back, so i don't think you can