Inside Micrometer Instruction Manual: A Step-by-Step Guide | MachineMFG

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Inside Micrometer Instruction Manual: A Step-by-Step Guide

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1. Product Introduction

The Inside Micrometer is a universal internal dimensional measurement tool that uses the principle of a screw pair to read the distance between the spherical measuring surfaces at both ends of the main body. It is especially suitable for measuring the inner diameter, groove, and distance between two parallel planes in mechanical processing. The accuracy level measured is generally IT8-IT10 as specified in GB/T1800.3-1998.

The center of the measuring head of the inside micrometer is set with a hard alloy sheet, which extends the service life of the inside micrometer.

The driving mechanism of the inside micrometer is composed of a micrometer screw and a threaded shaft sleeve fixed in the fixed sleeve; the differential, calibration nut, and micrometer screw are fastened together as moving parts; The measuring head, threaded shaft sleeve, fixed sleeve, etc. are connected as a fixed part. The inside micrometer has a compact structure and stable and reliable measurement accuracy.

All accuracy indicators meet national standards.

Users can choose the appropriate micrometer based on their measurement needs or place special orders according to their requirements. The specific specifications and graduation values are shown in Table 1.

Table 1

Series and indicatorsLower limit of measurement
50150250Individual inner diameter
Measuring range of micrometer head13255025
Graduation value0.010.010.010.01
Specification (measurement range)50-250
50-600
50-1000
50-1500
150-1500
150-2000
150-3000
250-2000
250-3000
250-4000
250-5000
250-6000
50-75
75-100
275-300

2. Structural Diagram

  • 1. Measuring contact
  • 2. Connecting sleeve
  • 3. Measuring head
  • 4. Threaded shaft sleeve
  • 5. Locking screw
  • 6. Fixed sleeve
  • 7. Differential
  • 8. Calibration nut
  • 9. Micrometer screw
  • 10. Measuring head
  • 11. Connecting rod
  • 12. Calibration clamp

3. Technical data

Technical data
Measuring range50~7575~125>125~200>200~325>325~500>500~600
Graduation value0.010.010.010.010.010.01
Indication error±0.006±0.006±0.008±0.010±0.012±0.016
Measure the spherical radius of the surface202020202020
The range of the micrometer screw is 13
Check the size and deviation of the card board by 50 ± 0.002

4. Instructions for Use

Observe whether there are any defects on the appearance of the Inside Micrometer that may affect the measurement. Clean the measuring contacts, measuring heads, and measuring heads, rotate the differential to check if it rotates flexibly, and check if the locking device is firmly fixed.

Before using the Inside Micrometer, use the calibration clamp to calibrate the zero position of the micrometer head (combination of 3-9 components), and apply even force.

If there is a slight error, first tighten the locking screw and then loosen the calibration nut to align the zero position of the differential cylinder with the longitudinal line of the fixed sleeve, and finally tighten the calibration nut.

When connecting the connecting rod to the Inside Micrometer during use, first unscrew the nut on the threaded shaft sleeve, and then tighten the right end of the connecting rod to the left end of the threaded shaft sleeve.

When using the Inside Micrometer to measure the aperture, support the measuring surface of the measuring contact on the measured surface, adjust the differential, and swing the measuring surface on one side of the differential cylinder in the radial section of the hole to find the maximum size, and then swing it in the axial section of the hole to find the minimum size. This adjustment needs to be repeated several times.

Finally, tighten the locking screw, remove the Inside Micrometer, and read the measurement. When measuring the distance between two parallel planes, swing the Inside Micrometer in multiple directions and take the smallest size as the measurement result.

5. Precautions

The Inside Micrometer can not only be used with a connecting rod for internal diameter and internal dimensional measurement but the micrometer head (combination of 3-9 components) can also be used as a single Inside Micrometer.

When using the Inside Micrometer, select the appropriate connecting rod from the provided connecting rod comparison table to form the required size to reduce cumulative errors. Also, connect the largest connecting rod to the micrometer head, and then sequentially connect to the measuring contact to reduce the bending of the axis after connection.

When using the Inside Micrometer to measure the aperture, at least one cross-section should be measured in two perpendicular directions. For deep hole measurements, the number of supporting faces should be appropriately increased.

Pay attention to the influence of temperature during measurement and prevent heat transfer from the hand or other heat sources. Especially for large-size measurements, special attention should be paid.

The support position of the Inside Micrometer during measurement should be correct. When measuring with a long-length Inside Micrometer, support it at 0.211L on both ends of the full-length size. This reduces deformation and minimizes measurement errors.

After measurement, the Inside Micrometer should be placed flat to avoid deformation of the instrument.

During use, be careful not to bump the micrometer. Before assembling the connecting rod, wipe clean all contact surfaces and measuring surfaces. After use, apply rust-proof oil to each measuring surface, and store them in a box.

The connecting rod comparison table is attached below.

Except for the (50-70) mm measurement range, all other components are connected to the micrometer head with a connecting sleeve.

Comparison Table for Extension Rod of (50-600) mm Inner Diameter Micrometer
Measuring range
mm
Micrometer head
50mm
Measuring contact
13mm
Measuring head
20mm
Extension rod NQ1
13mm
Extension rod NQ2
25mm
Extension rod NQ3
50mm
Extension rod NQ4
100mm
Extension rod NQ5
150mm
Extension rod NQ6
200mm
50~631
63~701
70~83  
83~951
95~1081
108~1201
120~1331
133~1451
145~1581
158~1701
170~183111
183~1951
195~2081
208~2201
220~2331
233~2451
245~2581
258~2701
270~2831
283~2951
295~3081
308~3201
320~3331111
333~3451
345~3581
358~3701
370~3831
383~3951
395~4081
408~4201
420~4331
433~4451
445~4581
458~4701
470~48311111
483~4951
495~5081
508~5201
520~5331
533~5451
545-5581
558~5701
570~5831
583~5951
595~6081

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