When measuring the outer diameter or inner diameter with a vernier caliper, the jaw should be opened slightly larger or smaller than the measured size, then push or open the cursor frame so that the claw is gently leaned against the measured surface. The force should not be too large to avoid measurement errors.
If there is a micro-motion device, when moving the cursor frame with the fine-tuning nut, the force of turning the nut should not be too large.
When measuring the groove width with a vernier caliper, the measuring line should be traversed by the standard caliper, and the cursor should be used to be straight to the groove width to take the minimum value.
The following should be noted:
1. After the vernier caliper is used, it should be wiped clean. Before using the vernier caliper, check the zero position first.
2. When the two measuring jaws touch the surface, observe whether the cursor zero line is aligned with the main rule zero line;
3. Rust oil, placed in a special box to prevent rust or damage;
4. The use of the vernier caliper is measured according to the shape of the surface to be measured and the appropriate portion of the claw is selected;
5. If the shaft diameter and the outer surface width are measured, the measuring surface shall be flat;
6. Measure the diameter of the arc on the shaft and apply the knife-shaped claws;
7. Height vernier caliper height Vernier calipers are used to measure height and scribe lines.
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