JEWEL BEARINGS MANUFACTURER IN DELHI

Welcome to voltmeter-jewel.blogspot.com,THE OFFICIAL SITE OF NAVI JEWELS.WE ARE THE LARGEST MANUFACTUERE OF VOLTMETER, AMMETER JEWEL BEARINGS IN DELHI, INDIA..
Navi Jewels are the Largest manufacturer of jewel bearings used in Voltmeter and Ammeter. We have covered almost whole delhi with our special quality and better polish Jewel bearings .

The jewel radius should be 2।5 to 3 times the pivot radius। In general, the greater the ratio between jewel and pivot, the greater the sensitivity and pivot roll। The contact area of the pivot should be highly polished and a finish of 2 to 3 micro-inch on the pivot radius is recommended.

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We mostly deals in the followings three Jewel bearings :

{ CONE SHAPED JEWEL }

In the bearing a steel shaft is turning ended with a radius smaller than the radius of the bearing cone apex. It is used in measuring instruments with a deflecting pointer (e. g. Voltmeter, ammeter).

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{ CUP SHAPED JEWEL }

Between the two bearings the instrument axis is freely - turning. It is ended with a radius (steel ball) smaller than the radius of the spherical recess. It absorbs especially axial pressures. It is used as a footstep bearing of the electricity meters of all kinds.

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{ VEE SHAPED JEWEL }

Vee Jewels are well suited to sensitive instruments where the moving element is light. They offer minimum friction when used with conical, small radiused pivots and permit slight lateral movement. The jewel radius should be 3 times larger than the pivot radius for low friction torque, sensitivity, and resistance to deformation. The contact area of the pivot should be highly polished and a micro-inch finish of 2 or better on the pivot radius is recommended.

These double-pointed pivots are used in conjunction with Vee Jewel and Vee Jewel Assemblies found under part numbers VJ, VJA, HST. To keep friction at a minimum, the radius in the pit of the Vee of the Jewel should be approximately three times larger than the radius of the pivot (3:1 ratio).

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Set in Brass, Vee Jewel Assemblies are screw mounted. Spring loaded assemblies are recommended in an environment of shock and vibration. The Beryllium Copper spring acts as a shock absorber and permits the jewel and pivot to move without breaking and then return to its normal position. Non-spring loaded screw mounted assemblies are typically used in a more stable environment. Pivot not included.

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FOR ANY TRADE INQUIRY OR PRICE LIST PLEASE CONTACT AT THE FOLLOWING E-MIAL :

Director: Navi Arora

e-mail: arora.jewel@yahoo.com

mobile: +91-9810559592

we bet that no one can give you such a high Quality jewel bearings at wholesale price....

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WHAT IS VOLTMETER ??

A voltmeter is an instrument used for measuring the electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage of the circuit; digital voltmeters give a numerical display of voltage by use of an Analog to digital converter.

Voltmeters are made in a wide range of styles. Instruments permanently mounted in a panel are used to monitor generators or other fixed apparatus. Small portable instruments, usually equipped with facilities to also measure current and resistance in the form of a multimeter, are standard test instruments used in electrical and electronics work. Any measurement that can be converted to a voltage can be displayed on a meter that is suitably calibrated; for example, pressure, temperature, flow or level ina chemical process plant.

General purpose analog voltmeters may have an accuracy of a few per cent of full scale, and are used with voltages from a fraction of a volt to several thousand volts. Digital meters can be made with high accuracy, typically better than 1%. Specially calibrated test instruments have higher accuracies, with laboratory instruments capable of measuring to accuracies of a few parts per million. Meters using amplifiers can measure tiny voltages of microvolts or less.

Part of the problem of making an accurate voltmeter is that of calibration to check its accuracy. In laboratories, the Weston Cell is used as a standard voltage for precision work. Precision voltage references are available based on electronic circuits.