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Either one or both tubes may be notched before assembly. A familiar example of tube notching is in the manufacture of bicycle frames. End notching works the end of the tube, such as a semicircular concavity to make the base of a tee, or a convex vee to fit into a mitre. Vee-notched tube, bent for assembly of a mitred joint
A HACO CNC punching machine Punched hole: best results for cutting surface with above 70% cutting, low clearance necessary (8% material thickness) Punch presses are developed for high flexibility and efficient processing of metal stampings. The main areas of application are for small and medium runs.
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A pattern notcher is a common tool used in patternmaking and sewing that creates a notch in a paper pattern. [1] Notches are used to align pattern pieces. Notches in the paper are more useful than marks on the paper as they allow the mark to be seen whether pattern paper is face up or face down.
The type of notch introduced to a specimen depends on the material and characterization employed. For standardized testing of fracture toughness by the Charpy impact method, specimen and notch dimensions are most often taken from American standard ASTM E23, or British standard BS EN ISO 148-1:2009.