Inside measuring micrometers and inside diameter micrometers are measuring instruments within the size, the difference between a word, so many people on the inside diameter micrometers and inside measuring micrometers in the end what the difference, or a little confused, today I will give you a comb in the end what they have similarities and differences. 

Generally speaking, the inside diameter micrometer than the measurement of the upper limit of the micrometer, but the most essential difference or the difference in structure, the inside diameter micrometer in line with the Abbey principle, the measured size axis and the standard size of the axis in the same line. The internal micrometer does not conform to the Abbey principle, the measured dimension axis and the axis of the standard dimension are perpendicular to each other, there are two claws and three claws of different forms, the structure is different, of course, the verification / calibration methods are also different, so the implementation of the technical standards are also different, namely JJG22-2003 "internal micrometer calibration procedures" and JJF1091-2001 "measurement of internal dimension micrometer calibration specifications". 

Inside diameter micrometer is usually a long rod type, but there is also a single rod type, regardless of the long rod type or single rod type, its smaller measurement of the lower limit are 50mm. and less than 50mm inside diameter micrometer on the one hand is not easy to manufacture, on the other hand is difficult to use, in order to solve less than 50mm inside diameter measurement, it is measured by the inside micrometer to make up, the structure of the inside micrometer is the inside card type, its measurement range is (5 ~ 30) (or 25) mm and (25 ~ 50) mm.

 Inside diameter micrometer and inside micrometer is the same system, the two are the same working principle, the former for more than 50mm inside dimension measurement, the latter for 50mm inside dimension measurement, so the accuracy of the inside micrometer is a little higher. And the internal micrometer is a three-jaw micrometer has 3 pivot points, is to measure the diameter of the hole, the internal measurement can measure the diameter of the hole, it also has 2 pivot points, can measure the diameter! 

Select a long rod, as far as possible to select the number of less long rod to form the required size, in order to reduce the cumulative error, in the connection of the long rod, should be arranged according to the size of the size of the rod, the size of the larger rod should be connected with the differential head, such as the size of the small rod in the middle of the combination of the rod, then after the length of the axis of the micrometer, will be due to the head end parallelism error "accumulation " and increase the bending, so that the measurement error increases. 

When using the measurement of the lower limit of 75 (or 150) mm inside diameter micrometer, the measured surface radius of curvature shall not be less than 25 (or 60) mm, otherwise the measurement can be made through the inside diameter micrometer measuring head spherical edge, measurement must pay attention to the influence of temperature, to prevent the hand heat transfer or other heat sources, especially the large size inside diameter micrometer by the temperature change is more significant, measurement should be strictly isothermal before, but also minimize the measurement time. 

Measurement, fixed probe and measured surface contact, swing the active probe at the same time, turn the differential cylinder, so that the active probe in the correct position and measured workpiece contact, you can read from the inside diameter micrometer, the so-called correct position refers to: measuring the distance between the two parallel planes, should be measured to the minimum value; measurement of internal diameter size, axial to find the minimum value, radial to find the maximum value, before leaving the workpiece reading, the application of locking device to measure the micro Screw locking, and then readings.

Inside measuring micrometers and inside diameter micrometers are measuring instruments within the size, the difference between a word, so many people on the inside diameter micrometers and inside measuring micrometers in the end what the difference, or a little confused, today I will give you a comb in the end what they have similarities and differences. 

Generally speaking, the inside diameter micrometer than the measurement of the upper limit of the micrometer, but the most essential difference or the difference in structure, the inside diameter micrometer in line with the Abbey principle, the measured size axis and the standard size of the axis in the same line. The internal micrometer does not conform to the Abbey principle, the measured dimension axis and the axis of the standard dimension are perpendicular to each other, there are two claws and three claws of different forms, the structure is different, of course, the verification / calibration methods are also different, so the implementation of the technical standards are also different, namely JJG22-2003 "internal micrometer calibration procedures" and JJF1091-2001 "measurement of internal dimension micrometer calibration specifications". 

Inside diameter micrometer is usually a long rod type, but there is also a single rod type, regardless of the long rod type or single rod type, its smaller measurement of the lower limit are 50mm. and less than 50mm inside diameter micrometer on the one hand is not easy to manufacture, on the other hand is difficult to use, in order to solve less than 50mm inside diameter measurement, it is measured by the inside micrometer to make up, the structure of the inside micrometer is the inside card type, its measurement range is (5 ~ 30) (or 25) mm and (25 ~ 50) mm.

 Inside diameter micrometer and inside micrometer is the same system, the two are the same working principle, the former for more than 50mm inside dimension measurement, the latter for 50mm inside dimension measurement, so the accuracy of the inside micrometer is a little higher. And the internal micrometer is a three-jaw micrometer has 3 pivot points, is to measure the diameter of the hole, the internal measurement can measure the diameter of the hole, it also has 2 pivot points, can measure the diameter! 

Select a long rod, as far as possible to select the number of less long rod to form the required size, in order to reduce the cumulative error, in the connection of the long rod, should be arranged according to the size of the size of the rod, the size of the larger rod should be connected with the differential head, such as the size of the small rod in the middle of the combination of the rod, then after the length of the axis of the micrometer, will be due to the head end parallelism error "accumulation " and increase the bending, so that the measurement error increases. 

When using the measurement of the lower limit of 75 (or 150) mm inside diameter micrometer, the measured surface radius of curvature shall not be less than 25 (or 60) mm, otherwise the measurement can be made through the inside diameter micrometer measuring head spherical edge, measurement must pay attention to the influence of temperature, to prevent the hand heat transfer or other heat sources, especially the large size inside diameter micrometer by the temperature change is more significant, measurement should be strictly isothermal before, but also minimize the measurement time. 

Measurement, fixed probe and measured surface contact, swing the active probe at the same time, turn the differential cylinder, so that the active probe in the correct position and measured workpiece contact, you can read from the inside diameter micrometer, the so-called correct position refers to: measuring the distance between the two parallel planes, should be measured to the minimum value; measurement of internal diameter size, axial to find the minimum value, radial to find the maximum value, before leaving the workpiece reading, the application of locking device to measure the micro Screw locking, and then readings.