KSC selected the bronze alloy after testing a half-dozen materials at Huntsville. In the first runs on the crawlerway's macadam surface, the coefficient reached nearly 1.0.27Ī fix for this was to develop a new bearing, a hydraulically lubricated sleeve bearing made of Bearium B-10. At a crawlerway conference on 27 June 1963, NASA engineers had insisted on a minimum design coefficient of 0.6. Finally, the crawler tests revealed that the estimated coefficient of sliding friction was far below the actual resistance experienced on the crawlerway. The thrust, or side load, proved greater than expected. At times as many as four of the eleven rollers on one truck were bearing no load. During the early crawler runs, KSC engineers discovered an unequal load distribution on the traction support rollers.
The designers had assumed an equal load distribution on all traction support rollers perfect thrust distribution over the entire bearing, i.e., an axial thrust equivalent to the radial load and a coefficient of sliding friction of 0.4 (meaning it would take four million pounds of force to move a ten-million-pound object). The bearing was re-designed during testing at KSC.ĭuring the test runs in the 1960s, while the crawler was making its run, members of the launch team found pieces of bronze and steel on the crawlerway.Ī reexamination of Marion's design calculation indicated some other significant facts. To come back to the bearing overheating problem mentioned in another thread. Two operator control cabs, one at each end of the chassis, are used to control all crawler systems. The top deck is flat and square, about the size of a baseball infield, 27 meters (90 feet) on a side. The height of the crawler is 6 meters (20ft) to 8 meters (26 feet) adjustable. The maximum speed of the Crawler-Transporter is about one mile per hour (1.6 km/h) loaded, or two miles per hour (3 km/h) unloaded The crawler consumes 150 US gallons of diesel fuel per mile (350 L/km) its tanks hold 5,000 US gallons (19 m³). Two 150 kW generators are also available to power the Mobile Launcher Platform. Two 750 kW generators, driven by two 1,065 hp (794 kW) engines, are used for jacking, steering, lighting, and ventilating. They are powered by 16 traction motors, powered by four 1,000 kW generators, driven by two 2,750 hp (2050 kW) diesel engines. in the 1960s and used to Transport the mighty Saturn V Rocket, and now used to Transport the Space Shuttle from the VAB to the Launchpad. So, first some general info about these Crawlers:Ī total of 2 were built by the Marion Power Shovel Co. I'm starting this thread as questions were raised in another thread.
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