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  2. Notching - Wikipedia

    en.wikipedia.org/wiki/Notching

    The first punch & die type tool for notching tube & pipe was invented in Chicago by Julius Vogel, who was issued a US patent in 1938. [1] The accuracy of punch notching is good, depending on the care with which it's carried out. For manual folding work, prior notching can often improve resultant accuracy of the folding itself.

  3. Disc cutter - Wikipedia

    en.wikipedia.org/wiki/Disc_cutter

    Cutting sheet metal, sizing metal stock for welding, cutting a weld to re-weld it, and cutting and notching steel pipe are just a few examples. Die grinders and chop saws are other common tools used with cutting discs. Smaller projects and smaller or more precise cuts may require a die grinder equipped with a cutting wheel. These cutting wheels ...

  4. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    Die nut s, also known as rethreading dies, are dies made for cleaning up damaged threads, [9] have no split for resizing and are made from a hexagonal bar so that a wrench may be used to turn them. The process of repairing damaged threads is referred to as "chasing." Rethreading dies cannot be used to cut new threads as they lack chip forming ...

  5. Plumber wrench - Wikipedia

    en.wikipedia.org/wiki/Plumber_wrench

    A plumber wrench A plumber wrench, with the key ring on the thread of the left handle Johan Petter Johansson with his wrench. A plumber wrench (or plumber's wrench, pipe wrench, Swedish wrench or Swedish pattern wrench [1]) is a form of plier described as a pipe wrench that uses compound leverage to grip and rotate plumbing pipes.

  6. Punching - Wikipedia

    en.wikipedia.org/wiki/Punching

    A die is located on the opposite side of the workpiece and supports the material around the perimeter of the hole and helps to localize the shearing forces for a cleaner edge. There is a small amount of clearance between the punch and the die to prevent the punch from sticking in the die and so less force is needed to make the hole.

  7. Research Finds Link Between This Childhood Virus and ... - AOL

    www.aol.com/research-finds-between-childhood...

    "Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Alzheimer's disease is the most common form of dementia, affecting more than three million Americans ...