Bits per inch

Two RK05 moving head cartridge disk drives provide mass storage capabilities of 3.2 million words. The most economic solution to long term storage is magnetic tape. A 9 track, 800 bits per inch, 45 inches per second tape drive was used. 

The quantity of information stored in a specified space of a storage system associated with a computer, e.g. bits per inch of magnetic tape. 

Each of these formats is preceded on tape by header or tailer information, which consists of ancillary data about the date, altitude of the sensor, sun angle, and so on. This information is useful when the data is corrected geometrically or radiometri-cally. The data are normally recorded on nine-track CCTs with data density on the tape of 800, 1,600, or 6,250 bits per inch (bpi). 

There is often a fundamental disparity between the graphic ability of computer monitors and that of printers. Monitors may use anywhere from 8-bit color (256 colors) to 24-bit color (16 million colors). Printers, except for dye sublimation models, use four colors, which are printed in a pattern that tricks the eye into seeing all colors. Monitors generally use about a 72-dpi (dots per inch) screen resolution, as compared to printer resolutions of 300 dpi or better. 

The workstation used is an IBM/PC AT and transmission of the image takes slightly over 1.5 minutes via a slow speed 1200 bits per second line. The image vectors are displayed on the workstation with a graphics card driven by software to convert the vectors back to pixels. These vectors can be converted to PostScript at the workstation and sent to an attached laser printer for hardcopy output at 300 dots per inch. The picture used as Figure 3 was made from the actual laser printer hardcopy output. 

If Bolt Diameter (in.) Is And Threads Per Inch Is Then Drill Size For 75% Thread Is Then Clearance Drill Bit Size Is... 

Bit Hydraulic Horsepower. The effective level of hydraulic energy (hydraulic horsepower per square inch) is the key to optimum bit performance. The rule-of-thumb estimate of diamond bit hydraulic horsepower HPj and penetration rates is shown in Table 4-99. The bit hydraulic horsepower is dependent upon the pressure drop across the bit and the flowrate. 

Since the rock formation to be drilled is classified as extremely hard, 1.5 hydraulic horsepower per square inch of bit area will be used as bit cleaning and cooling requirement [87]. The projected bottomhole area of the bit (in. ) is... 

Specific volume is a conversion of specific gravity into cubic inches per pound. Since the volume of material in a product is the first bit of information established after its shape is formulated, the specific volume is a convenient conversion factor for weight ... 

Zirconium oxide has also been used as a substrate by itself. Researchers at Cornell University evaporated some of the yttrium superconductor with beams of high-energy electrons, deposited the vapors onto bits of the zirconia, and then etched a circuit pattern a fraction of an inch long. Not only did the superconductor film carry current of around 1,000,000 amps per square centimeter, but it conducted electrical impulses as brief as ten to fifteen-trilli-onths of a second without distortion—impossible with conventional materials—and at very high levels of current. Those incredibly short pulses raise the distinct possibility that an enormous amount of electronic data, not only in a computer but in a telephone line as well, can be transmitted via the new superconductors at ultrafast speeds. 

Early wells were sunk by ramming. This was replaced by rotary drilling, where the bit turns at 50 to 300 revolutions a minute. Different bits are used for soft or hard rocks or coring. They tend to crumble the rock. Drilling speed can vary from 8 inches an hour in hard rocks to 100 feet per hour in soft ground. 

Dffinition, Chip load is defined as advance per revolution and is usually expressed in mils (1 mil equals Viooo of an inch [0.001 in]). It impUes the distance the drill travels during the drill stroke per each full revolution of the drill bit. Chip load is used to calculate the infeed rate in inches per minute (ipm). 

Deftnition. Retract rate is the speed at which the drill bit exits the stack following the drill stroke and is expressed in inches per minute (ipm). Machine default (maximum) settings vary between manufacturers and may range anywhere from 500 to 1000 ipm. 

HOLE PULL strength The force, in pounds, necessary to rupture a plated-through hole or its surface terminal pads when loaded or pulled in the direction of the axis of the hole. The pnll is usually applied to a wire soldered in the hole, and the rate of pull is given in inches per minnte. hook a geometric drill bit defect of the cutting edges. 

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