Lathe Metalworking

Vernier Digital

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2 12 LCD Digital 300mm Caliper Vernier w Case Gauge Micrometer Measuring Tool    US $68.90

Digital Electronic Caliper Vernier Gauge Micrometer P044    US $17.50

Fowler Outside OD Micrometer EDP1059 0 3 Set Vernier Analog Digit Machinist    US $51.00

150 mm 6 Digital Caliper Vernier Gauge Micrometer    US $10.99

24 Digital Caliper Micrometer Vernier SAE Metric MM    US $149.99

Digital LCD Caliper Vernier Gauge 150mm 15cm 6 001 mm    US $18.99

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Digital vernier calipers work by having a digital encoder (explained later) attached to a small gear which turns on a rack gear (long, linear gear) which runs along the length of the caliper.

The digital encoder has a large number of alternating opaque and transparent bands arranged radially around a disk which is turned by the small gear. Two led/phototransistor pairs monitor the passage of the bands. By watching in pattern of light transmission, and which phototransistor sees the change first, a small digital circuit determines how many bands have passed from the zero point.

Because the gear ratios are fixed, and the bands on the disk are fixed, the circuit is programmed to translate one band into a certain distance of the caliper. This distance is converted to the appropriate inch or millimeter value, and displayed on the LCD.

HobbyKing Digital Vernier Calipers

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	Digital LCD Caliper Vernier Gauge Micrometer 6" 150 mm

	Electronic LCD Digital Vernier Caliper

	HK 6" 150 mm Digital Vernier Caliper Micrometer Guage Widescreen Electronic Accurately Measuring Stainless Steel High Precision P-044 Sale Price: $11.19

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