Vernier Caliper/stainless Steel/0- 200MM/0.02MM

Item No:W26642

 

1. Core measurement functions and principles

1. Main measurement objects

Length measurement: Measure the linear length of the object (such as plate thickness, part side length) by aligning the scales of the main ruler and the vernier ruler.

 

Inner and outer diameter measurement:

The outer measuring claw (outer bayonet of the caliper) is used to measure the outer diameter of the object (such as cylinder diameter, pipe outer wall size);

The inner measuring claw (inner bayonet of the caliper) is used to measure inner diameter size such as hole diameter and groove width (such as bearing inner ring diameter and circular hole width).

 

Depth measurement: Some vernier calipers have a depth gauge that can be inserted into grooves or holes to measure depth (such as blind hole depth, step height).

 

2. measuring principle

Accurate reading is achieved by using the scale difference between the main ruler (accuracy 1mm) and the vernier ruler (50 grids correspond to the main ruler 49mm, each grid 0.02 mm). When the two measuring claws are attached, the zero scale of the vernier ruler is aligned with the zero scale of the main ruler; during measurement, the vernier ruler moves with the measuring claw, and the size accurate to 0.02mm is calculated by reading the overlapping scales of the main ruler and the vernier ruler.

 

 

2. Application scenarios and industry applications

1. Mechanical processing and manufacturing

Part inspection: After processing by lathe or milling machine, measure whether the size of the part meets the drawing requirements (such as shaft diameter, groove width, step length). For example:

Measure the diameter of gear tooth tip circle to ensure transmission accuracy;

Check the length of the bolt and the inner diameter of the nut to determine whether it is a standard part.

 

Mold manufacturing: Measure the size of the mold cavity (such as the hole depth of the injection mold and the edge width of the stamping mold) to ensure product forming accuracy.

 

2. Electronics and precision instruments

Component measurement: Measure the bond pad spacing on the circuit board, chip package size (such as the pin spacing of QFP package), or the overall size of precision resistors and capacitors.

 

Instrument debugging: In the production of spectrometers and sensors, measure key size of optical elements (such as lens diameter, slit width) to ensure instrument performance.

 

3. Scientific Research and Laboratory

Materials research: Measure the thickness of metal plates, film samples, or the diameter of powder pressed parts for material property analysis.

 

Physical experiment: In the mechanical experiment, the initial size of the specimen (such as the gauge length of the tensile specimen) is measured to provide a basis for data calculation.

 

4. Daily and industrial quality inspection

Hardware and building materials: Measure the wall thickness of the pipe, the side length of the angle steel, etc., to determine whether the building materials meet the specifications (such as the cross-section size of the aluminum alloy profile).

 

Quality inspection sampling: Sample and test the product size in the production line, such as the frame width of the mobile phone case and the matching size of auto parts, to ensure the consistency of batch production.

 

 

3. Adaptation scenarios between 0- 200MM range and 0.02MM accuracy

Range characteristics: 0- 200mm belongs to the medium range and is suitable for measuring small and medium-sized parts (such as phone case, bearings, and small pipes). Compared with the 0- 150mm range, it is more suitable for slightly larger size objects, and it is also more portable than the 0- 300mm range.

 

Accuracy advantages: The accuracy of 0.02mm (i.e. 20 microns) meets most industrial measurement needs (for example, the tolerance of parts in the IT industry is usually ±0.05mm), and can be used for the detection of general precision machined parts (but cannot meet the requirements of micron ultra-precision measurement, a micrometer or a coordinate measuring instrument is required).

 

 

4. Precautions for use

Calibration before measurement

Close the measuring claw and check whether the zero scale of the vernier ruler is aligned with the zero scale of the main ruler. If there is any deviation, adjust or record the error first.

 

correct working method

When measuring the outer diameter, the outer measuring claw needs to clamp both sides of the object and apply slight pressure to ensure fit; when measuring the inner diameter, the inner measuring claw needs to open to the maximum position in the hole and then read.

 

Avoid overload measurement

It is strictly prohibited to measure objects with a range exceeding 200mm, or forcibly hold hard objects (such as cast burrs) with measuring claws to avoid deformation of the caliper.

 

maintenance

After use, wipe the measuring surface with a soft cloth, apply a small amount of anti-rust oil (stainless steel material can be reduced appropriately), and store it in a special box to avoid extrusion or collision.