Use of Basic Measurement Tools

1. Application of calipers

The caliper can measure the inner diameter, outer diameter, length, width, thickness, step difference, height and depth of the object; the caliper is the most commonly used and most convenient measuring tool, and the most frequently used measuring tool at the processing site.

Digital Caliper: Resolution 0.01mm, used for size measurement with small tolerance (high accuracy).

 

Table card: resolution 0.02mm, used for conventional size measurement.

 

Vernier caliper: 0.02mm resolution, used for roughing measurement.

 

Before using the caliper, remove the dust and dirt with clean white paper (use the outer surface of the caliper to catch the white paper and then pull it out naturally, repeat 2-3 times)

When measuring with a caliper, the measuring surface of the caliper should be as parallel or perpendicular to the measuring surface of the measured object as possible;

When using depth measurement, if the measured object has an R angle, it is necessary to avoid the R angle but close to the R angle, and the depth ruler should be as vertical as possible to the measured height;

When the caliper measures the cylinder, it needs to be rotated and the maximum value is measured in sections; cnc machining part

Due to the high frequency of using calipers, the maintenance work needs to be the best. After each day of use, it needs to be wiped clean and placed in the box. Before use, a block is needed to check the accuracy of the caliper.

 

2. Application of micrometer

 

Before using the micrometer, remove the dust and dirt with a clean white paper (use the micrometer to measure the contact surface and the screw surface and the white paper is stuck and then pull it out naturally, repeat 2-3 times), then twist the knob to measure the contact When the surface is in quick contact with the screw surface, fine adjustment is used, and when the two surfaces are completely in contact, zero adjustment can be performed to measure. machined part

When measuring the hardware with a micrometer, move the knob, and when it comes into contact with the workpiece, use the fine-tuning knob to screw in. When you hear three clicks, stop, read the data from the display or scale.

When measuring plastic products, the measurement contact surface and the screw lightly touch the product.

When measuring the diameter of shafts with a micrometer, measure at least two directions and measure the micrometer in the maximum measurement in sections. The two contact surfaces should be kept clean at all times to reduce measurement errors.

 

3. Application of height ruler

The height gauge is mainly used to measure the height, depth, flatness, verticality, concentricity, coaxiality, surface vibration, tooth vibration, depth, and height. When measuring, first check the probe and the connection parts for looseness.

4. Precision measuring instrument: secondary element

The second element is a non-contact measuring instrument with high performance and high precision. The sensing element of the measuring instrument is not in direct contact with the surface of the measured part, so there is no mechanical measuring force; the second element transmits the captured image through the data line to the data acquisition card of the computer through the projection method. Imaged on the computer monitor by the software; various geometric elements (points, lines, circles, arcs, ellipses, rectangles), distances, angles, intersections, geometric tolerances (roundness, straightness, parallelism, vertical) Degree, inclination, position, concentricity, symmetry), and CAD output for outline 2D drawing. Not only can the workpiece contour be observed, but also the surface shape of the opaque workpiece can be measured. CNC

5. Precision measuring instruments: three-dimensional

The characteristics of the three-dimensional element are high precision (up to μm level); universality (can replace a variety of length measuring instruments); can be used to measure geometric elements (in addition to the elements that can be measured by the second element, it can also measure cylinders and cones) , Shape and position tolerance (in addition to the shape and position tolerance that can be measured by the second element, including cylindricity, flatness, line profile, surface profile, coaxiality), complex surface, as long as the three-dimensional probe Where it can be touched, its geometric size, mutual position, surface profile can be measured; and data processing is completed by means of a computer; with its high precision, high flexibility and excellent digital capabilities, it has become an important part of modern mold processing and manufacturing and quality assurance Means, effective tools.

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