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The Jacobs Taper (abbreviated JT) is commonly used to secure drill press chucks to an arbor. The taper angles are not consistent varying from 1.41° per side for No. 0 (and the obscure # 2 + 1 ⁄ 2) to 2.33° per side for No. 2 (and No. 2 short). There are also several sizes between No. 2 and No. 3: No. 2 short, No. 6 and No. 33.
Its dimensions are confusingly close to JT6, but not close enough, and the Jacobs Chuck company doesn't acknowledge it in their literature. At least to me, "obsolete" seemed to imply that if I go looking for vintage chucks, one with a JT 2 1/2 arbor mount might pop up, but I've found no indication that this is the case.
The Pratt & Whitney JT3D is an early turbofan aircraft engine derived from the Pratt & Whitney JT3C turbojet. It was first run in 1958 and was first flown in 1959 under a B-45 Tornado test aircraft.
One brand name for this type of chuck, which is often genericized in colloquial use although not in catalogs, is Super Chuck. [citation needed] A pin chuck is a specialized chuck designed to hold small drills (less than 1 mm (0.039 in) in diameter) that could not be held securely in a normal drill chuck. The drill is inserted into the pin chuck ...
Several machine collets (top and centre) and a dismantled pin chuck (below). Generally, a collet chuck, [3] considered as a unit, consists of a tapered receiving sleeve (sometimes integral with the machine spindle), the collet proper (usually made of spring steel) which is inserted into the receiving sleeve, and (often) a cap that screws over the collet, clamping it via another taper.
Chuck Jacobs (born May 11, 1990) is a former American football wide receiver. He signed as an undrafted free agent with the San Francisco 49ers in 2013. He has also been a member of the Baltimore Ravens and Toronto Argonauts .
A Pratt & Whitney R-985 engine, produced by Jacobs during World War 2. Jacobs engines were fitted to many US-built aircraft of the inter-war period, including several Waco models. They were in use in 26 different countries including in Canada, where 330 horsepower L6-MB engines were used to power the Royal Canadian Air Force's Avro Anson Mk.
The General Electric/Allison J33 is an American centrifugal-flow jet engine, a development of the General Electric J31, enlarged to produce significantly greater thrust, starting at 4,000 lbf (18 kN) and ending at 4,600 lbf (20 kN) with an additional low-altitude boost to 5,400 lbf (24 kN) with water-alcohol injection.
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