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The SDS bit was developed by Bosch in 1975 improving on the TE system introduced by Hilti in 1960. Hilti's original 10 mm TE-D and 18 mm TE-F shanks can be used in SDS-plus and SDS-max chucks respectively but not vice versa while the newer TE-C, TE-T and TE-Y are fully compatible. The SDS name is an acronym of German: Steck – Dreh – Sitzt!
Other types of shank used include hex-shaped, and various proprietary quick release systems. The diameter-to-length ratio of the drill bit is usually between 1:1 and 1:10. Much higher ratios are possible (e.g., "aircraft-length" twist bits, pressured-oil gun drill bits , etc.), but the higher the ratio, the greater the technical challenge of ...
Gas checks are most commonly found in the form of a thin cup or disc made of a ductile metal. Copper, zinc, aluminum, and alloys such as brass have been used. A bullet designed to accept a gas check has a rebated base shank which permits attachment of the check without altering the maximum diameter of the bullet.
A 12 mm × 640 mm gun drill and carbide tip of 25 mm drill. Coolant holes in tip and base of gun drill. Gun drills (through coolant drill) are straight fluted drills which allow cutting fluid (either compressed air or a suitable liquid) to be injected through the drill's hollow body to the cutting face.
José Enrique Menendez was born on May 6, 1944, in Havana, Cuba.At age 16, due to the Cuban Revolution, he moved to the United States. [citation needed] José attended Southern Illinois University, where he met Mary Louise "Kitty" Andersen (1941–1989).
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