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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.
The Jacobs Rubber-Flex brand is a name that most machinists would recognize for this type of collet chuck system. Regardless of the collet design, the operating principle is the same: squeeze the collet radially against the tool or workpiece to be held, resulting in high static friction. Under correct conditions, it holds quite securely.
The Atlas Cheetah programme originated during the 1980s out of South Africa's requirement for more capable fighter and strike aircraft. At the time, the South African Air Force (SAAF) was confronted by the need for more advanced aircraft to attain an edge over the ever-more sophisticated Soviet -built aircraft, such as the MiG-23 , that were ...
The AC-4 flight (Atlas 146D and Centaur #4) was launched on 11 December 1964 at 14:25:02 GMT with a payload of 2993 kg (that carried a mass model of the Surveyor spacecraft). It performed propulsion and stage separation tests, [5] following two scrubbed attempts due to bad weather. The guidance system was operated closed-loop for the first time ...
Atlas-Centaur-D LV-3C AC-9 CCAFS LC-36B Surveyor SD-4 Test flight vehicle HEO: Success Performed first ever liquid hydrogen rocket engine restart in space. 11 1967-04-07 07:05 Atlas-Centaur-D LV-3C AC-12 CCAFS LC-36B Surveyor 3: Lunar lander HEO: Success 12 1967-07-14 11:53 Atlas-Centaur-D LV-3C AC-11 CCAFS LC-36A Surveyor 4: Lunar lander HEO ...
The D21 was replaced in 1970 by the Model 210 and Two-Twenty, also with a 7 litres (427 cu in) engine, which was rated at 122.4 and 135.95 horsepower (91.27 and 101.38 kW) respectively. The D21 was a favorite for tractor pullers and still makes good showings at the pulls today.