What are the methods of measuring sharpness and diameter, and what are them?

Method. 1. Directly measure the circumference of the circle, and then deduce it directly according to the circumference formula, that is: diameter = perimeter.

Method. 2. Directly measure the diameter of a circle by the following methods:

1. The distance from the center of the circle to the two points on the edge is the diameter, and make an inscribed right triangle in the circle, and the hypotenuse of the right triangle must pass through the center of the circle;

2. Measure the distance of the hypotenuse of the right triangle, which is the diameter of the circle.

Method. 3. The area through which the circle passes. According to s = r 2, calculate the radius and multiply it by 2 to get the length of the diameter.

Method. Fourth, measured by the perimeter. According to c=2 r= d, the diameter is equal to the circumference divided by pi.

(l) Use two square wooden blocks and a scale to cooperate, as shown in Figure 124a. However, it should be noted that the two square blocks should be checked before measuring (i.e. the two planes in contact with the cylinder must be parallel).

2) Measure directly on the cylindrical end face with a scale. However, it should be noted that the diameter is the longest string when measuring.

5) Direct measurement with tools such as vernier calipers and spiral micrometers. The method will be described in the high school student experiment section.

You can measure the diameter with a ruler, assuming that there is only a circumference and no center of the circle, if there is, draw a straight line through the center of the circle to be the diameter.

The measured circle is called circle a, and the diameter is drawn with a ruler.

1.Mark a little p1 on the circumference

2.If the compass is used to draw arc b with the point p1 as the center of the circle and the diameter of the circle to be measured about 3 4 as the radius, then the arc b and the circle a have 2 intersection points, which are denoted as p2 and p3

3.The radius of the compass remains unchanged, with P1 and P2 as the center of the circle, and the arc C,D is drawn near the circumferential area opposite point A, then C,D have the intersection point P4

4.If you draw a straight line with a ruler through P1 and P4, then the line and the circle have a second intersection point P5, and the straight line P1-P5 is the diameter.

You can directly use the ZM10X diameter measuring series sensor to measure the diameter of the object, you can also use two 2D laser profile scanners to measure, you can also use two 1D lasers to measure the maximum diameter of the product at the same time, of course, there is also the outer diameter micrometer, vernier caliper, these are OK.

There are many kinds of roughness testers, and the specific selection should be determined according to the size, material, and roughness value of your workpiece.

Generally speaking, the roughness tester is divided into two types: contact type and non-contact type, and there are two types of contact type: desktop and handheld, and the contact profilometer is the most common application in the machinery manufacturing industry; The non-contact type is mainly white light interferometer, which has the highest accuracy and can reach nanometers, and is mainly used for ultra-precision surface roughness measurement, which is widely used in the semiconductor industry, 3C industry, optics and colleges and universities.

<> the current roughness tester is automatically measured, the operation is relatively simple, and the specific steps refer to the manufacturer's manual.

The following can tell you the operation steps of SuperView W1 Optical 3D White Light Interferometer roughness analysis:

Place the sample on the fixture to ensure that the sample is stable;

Place the fixture on the stage;

Check the motor connection and environmental noise to confirm the status of the instrument;

Use the joystick to adjust the triaxial position, move the sample under the lens and locate the interference fringes on the surface of the sample;

Complete operations such as scan settings and naming;

Click Start Measurement (enter the 3D view window to rotate and adjust for a while);

Enter the data processing interface, click "Remove Shape", use the default parameters, and click Apply to obtain the surface roughness profile of the sample;

Enter the analysis tool module, click Parameter Analysis, directly obtain the surface roughness data, click the parameter standard on the right to replace the parameter standard, and add or delete the parameter type;

If you want to get line roughness data, you need to extract the hatching;

Enter the data processing interface, click the "Extract Profile" icon, and select the appropriate direction profile line for profile extraction;

Enter the analysis tool interface, click the "Parameter Analysis" icon, click the parameter standard on the right, and check the required line roughness related parameters to obtain the line roughness RA data.

Please click Enter a description.

Please click Enter a description.

Roughness refers to the degree to which the machined surface of the work is not smooth. In the cutting process, the cutting marks caused by the feed appear in the form of crests and troughs, and the peak-to-trough height is very small, generally more than a few tenths of a micron, so the surface roughness belongs to the microscopic shape error of the surface of the part. Its measurement method:

1) Direct measurement method: use optical and electric instruments to directly measure the relevant parameters on the surface of the part to determine the roughness grade.

Direct measurement is further divided into contact measurement and non-contact measurement.

2) Comparative measurement method: compare the measured surface with the standard roughness sample to evaluate the roughness grade. The roughness template (also known as the roughness standard block) is a group of metal blocks made by different processing methods (turning, planing, flat milling, end milling, grinding, etc.).

3) impression method: this method is mostly used for the inner surface that can not be directly measured by the instrument, the impression can be made into a block with plastic materials, and it is attached to the measured surface, and the contour of the measured surface is copied on the laminating surface after being removed, and then the impression is measured to determine its roughness grade.

4) Comprehensive measurement method: it uses a certain characteristic of the measured surface to indirectly evaluate the level of surface roughness, but cannot measure the specific value of the uneven height of the peak and valley.

1) Direct measurement method, direct measurement is divided into contact measurement and non-contact measurement.

2) Comparative measurement method.

3) Impression method.

4) Comprehensive measurement method.

The specific amount of tuning is also related to the hardware of the TV and the appreciation angle of each person, generally around 70.

I often hear the term visual function, what is visual function? What should I do if my vision is abnormal?

Simultaneous vision, fusion vision, stereoscopic vision, adjustment function, collection function, fusion function, if there is a problem, there will be corresponding problems with the visual function, and there will be problems with vision.

Easy Vision Houzai store.

Generally, two kinds of examinations are required, one at a distance of 5m and the other at a distance of 33cm. Alternate bite: Alternately cover both eyes with a mask plate and observe the movement of the covered eye.

Monocular Occlusion: Place the shutter on one eye and remove it abruptly. Herschberg:

Place the lamp 30 cm away from the patient and let the patient look at it.

1.Measured with the ohmic level of the multimeter;

It is used for the measurement of general resistance.

2.Measured by voltammetry;

It is used to measure the resistance of the loop.

3. Measure with a bridge;

Measurement of DC resistance of transformers, generator coils.

4.Megohmmeter shake measurement;

It is used to measure the insulation resistance of generators, transformers, motors, etc.

, conventional level measurement, total station trigonometric elevation, GPS elevation fitting.