Vernier caliper is a precision measuring tool that is widely used in machining, quality control, and other fields.
This article will give you a detailed breakdown of the various measurement parts of vernier calipers and how to use
them accurately for measurement.
Ⅰ. Basic structure
1. Main body: A fixed ruler with millimeter scales.
2. Vernier scale: Sliding scale for reading decimal parts.
3. Fixed external jaw: It is used to measure the outer diameter and external dimensions.
4. Fixed internal jaw: It is used to measure the inner diameter and internal dimensions.
5. Depth bar: Used to measure depth.
6. Locking screw: Used to lock the position.
Ⅱ. How to use the external measuring jaw
The outer measuring jaw is the most commonly used measuring part of vernier calipers, which is mainly used
to measure the external dimensions such as outer diameter, thickness and width of the workpiece.
1. Clean: Before use, make sure that the outer measuring jaw and the surface of the object to be measured
are clean and free of impurities.
2. Alignment: Place the outer measuring jaw perpendicular to the surface of the object to be measured.
3. Apply force: Gently close the measuring jaw so that it is in contact with the surface of the object to be measured.
4. Reading: Lock the set screws and read the scale on the main ruler.
Ⅲ. How to use the internal measuring jaw
The inner measuring jaw is used to measure internal dimensions such as inner diameter and groove width.
Special attention needs to be paid to the control of the measuring force when using the inner measuring jaw
to ensure accuracy.
1. Use: Place the inner measuring jaw into the hole or slot to be measured.
2. Adjust: Gently shake the caliper to find the maximum reading position.
3. Fix: Hold the caliper position unchanged and tighten the locking screw.
4. Reading: Hold the caliper position unchanged and tighten the set screw.
Ⅳ. Correct application of the depth bar
The depth bar is another important measurement part of the vernier caliper, which is mainly used to measure
the depth of the hole or the height of the step.
1. positioning: The end face of the caliper ruler is attached to the surface of the object to be measured.
2. stretch: Slowly push out the depth bar until it touches the bottom of the hole or step.
3. calibration: Make sure the depth bar is parallel to the hole axis.
4. Reading: Lock the position and read the data.
