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Next we had to figure out how to drive the wheels I originally wanted to use timing belts to drive the wheels, but I decided to go with regular chains and sprockets because they were cheaper From the Grainger catalog, we could see that a No 40 chain had a maximum load rating of 1,000 pounds With a service factor of 2 for intermittent and shock loading, this would equate to a load rating of 500 pounds Since this was greater than the stall torque of the motors, we decided that this chain should work fine At this point, we ordered a whole mess of parts from Grainger: sprockets, chains, spherical pillow blocks for the four axles, and four flange mount pillow blocks for the motor mounts Another friend, Robert Niblock, told me about a local machine shop that builds custom racing go-karts and suggested that they might sell me some used parts So Dave and I ran over to the machine shop to see what we could haggle over Ken Frankel showed us his high-speed, state-of-the-art racing go-karts They looked just like miniature Lemans or Indy racing cars We talked for a few hours, and he sold us some of his used aluminum wheels and a dozen used racing tires, along with a set of four mounting hubs The used racing tires were great because they were already gummed up from racing, so they provided lots of extra traction

Voice connections were designed to be fully compatible with applicable ANSI T1 standards for the United States and the CCITT G and Q Recommendations (International T1/E1 standards) for digital transmission systems using either SS7 and R1 signaling The data channel specifications were compatible with the OSI standards and with CCITT V and X series recommendations

The system control segment (SCS) of the network provided the necessary control over the entire satellite constellation The SCS managed and controlled all the system elements, providing service on both the short- and long-term picture The functionality of the SCS was divided into either active control of the satellites and control over the communications assets within the satellites The SCS monitored and managed the overall network control sequencing, traffic load balancing, and peak conditions, as necessary

The next step was to build the motor housings Cordless drill motors are not designed to be used as regular motors, so there really isn t any good mounting points on the motor and gearbox I used a pair of calipers and reverse engineered the exterior geometry of the motors and gearboxes Figure 14-7 shows a layout of the components used to make the mounts for the gearbox, and Figure 14-8 shows a photograph of the assembled gearboxes The parts were machined using an abrasive waterjet Yup, water and sand was used to cut all these metal parts When water is pressurized to 55,000 psi and a little sand is added to it, it can cut any material known to man One of the nice things about an abrasive waterjet is that it can cut some rather intricate features without difficulty

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As already mentioned earlier, several other suppliers have all the rights and licenses to launch similar communications services, using constellations of Low Earth Orbits, either Mid Earth Orbits or Geostationay Orbits This is the personal communications service of the future The companies (at least seven others in the United States) are all vying for the licenses to use the L band communications bandwidth to provide global communications These include some of the other big names in the business such as Qualcomm, Loral, TRW, Microsoft, and McCaw Communications Each of the companies has a different approach to use, but they all share a common goal Get there soon and offer high-speed digital communications with Internet access, e-mail, voice over, IP, and demand video services

14-7

that the cube performs a series of queries to read dimension and fact data Data records are transformed into a binary format for storage by Analysis Services After records are read and stored, aggregations and indexes are built The time it takes to process a cube depends on many factors, the main one being the size of the fact tables in the star schema database Microsoft is often considered to have one of the fastest cube building engines on the market, but extremely large cubes can still take hours and hours to process Don t forget, too, that processing copies data from the star schema and stores it in a new format; this means that the data is a snapshot in time and updates to the star schema will not be reflected until the cube is reprocessed The good news is that there are a number of processing techniques One is a full process, in which all existing data is removed from the cube and it is completely reloaded Another only adds new records to the cube There are others as well, and they exist to cover different needs in different situations There is also a technology in Analysis Services 2005 called Proactive Caching, which allows a cube to update an in-memory cache instead of having to physically reprocess the cube This feature is designed to allow cubes to be more real-time than those that are processed in the traditional, scheduled fashion There are also several different storage formats, such as leaving all data in the relational engine The specifics of these are beyond the scope of the book, but the overall process is basically the same as described here Understand that in almost all cases, storing data in the binary Analysis Services format, called MOLAP for Multidimensional OLAP, is the fastest way to retrieve data for reporting and analysis.