The most precision instrument for measurement of parameters of details is the caliper. With its help it is possible to determine both external, and internal dimensions and also depths of flutes, grooves and openings.
It is required to you
- - caliper,
- - detail prototype.
Instruction
1. These high-precision measuring devices are manufactured of metal. The plastic calipers released by the industry are intended more for working off of working methods with the device in educational institutions. Let's consider rules of carrying out measurements by ShTs-1 caliper. Its limits of measurement from 0 to 125 mm. Accuracy is 0.1 mm.
2. To measure the external sizes of a detail, external diameter of a core or a pipe, use the lower sponges of a caliper. Moving against the stop a mobile lower sponge, densely press out the measured detail. That indications when reading did not get off, record its situation the tightening screw of a frame. Now the device can be removed from the measured detail. Read out an integer of millimeters from a millimetric scale of a bar of a caliper to a zero stroke of the nonius. And you watch the tenth shares on a nonius scale. It will be value of a stroke which coincides with a stroke on a millimetric scale. The division price on a scale of the nonius is 1.9 mm.
3. For measurement of internal diameters, for example, of internal diameters of pipes, the top motionless and mobile sponges serve. Reduce the top sponges of a caliper together and lower in the measured cavity. Taking away a mobile sponge against the stop, record their situation the tightening screw. Take out a caliper and take readings in already described way.
4. To measure depth of a groove, flute, opening, use a caliper depth gage needle. Plunge a depth gage into the measured deepening and lower a bar against the stop. Record situation the tightening screw. Take out a caliper and take readings.