CNC Machining Parts Quality Inspection Tool: Microscope

In the quality inspection tools of CNC machined parts, there are various tools such as two-dimensional, three-dimensional, calipers, height instruments, salt spray testing, microscopes, and so on. Every CNC machining quality inspection tool has a dedicated inspection method, and the microscope is no exception, so today we focus on the operation method and maintenance method of the microscope in the mechanical CNC machining.

What is a microscope?

A microscope is a technical instrument used to observe the structure of tiny objects that cannot be distinguished by the naked eye. It consists of an observation microscope and a precision movable cross table. It is widely used in the precision parts manufacturing industry. Its main function is mainly two-dimensional inspection, which is used to check the surface condition and surface roughness of CNC machined parts.

The uses of the microscope are:

Automobile industry: Observe foreign objects on the paint surface of the car body to identify the source of pollution.

Metal observation: Observe larger objects without glare.

Electronics industry: surface defect inspection and dimension measurement of multilayer capacitors.

Circuit board observation: analyze the glass fiber and resin in the cross section of the epoxy glass base layer of the printed circuit board.

Method of using microscope to inspect CNC machined parts

1. Alignment (crimping) method

The accuracy of the micromirror is certain, and the measurement accuracy of the CNC machined parts must be guaranteed. Therefore, different methods will be used to align. In order to ensure the measurement accuracy of the CNC machined parts, the M-shaped line can be used to align the contour of the measurement part. However, in order to have a large degree of correct alignment method, there are the following two methods:

(1) Overlapping alignment

The overlap alignment method is used in length measurement. That is, the dotted line of the Mi shape line exactly overlaps the edge of the contour image, so that half of the dotted line is inside the contour image and the other half is outside the image. When aligning, the center of the dotted line of the meter line should be used as the standard, and the extended part of the dotted line should be used as the reference, so that the microscope can obtain accurate measurement results of the CNC machined parts.

(2) Gap alignment

The gap to line method is suitable for angle measurement. When measuring the angle with a microscope, when any dotted line of the meter line is close to the side of the measured angle in the field of view, a narrow gap should be maintained between the dotted line of the meter line and the edge of the measured angle. The uniformity of the gap size is used to determine the alignment accuracy between the dotted line of the m-shaped line and the edge of the DUT image.

2. The diaphragm adjustment of the microscope eyepiece:

To adjust the diopter of the eyepiece of the microscope, you must first adjust the clear scribed image in the eyepiece field of view. If the measurer cannot obtain a clear scribed image in the eyepiece field of view, the eyepiece diopter circle should be adjusted. The diopter is adapted to the examiner's vision, so as to obtain a clear M-line. Move the central microscope through the focusing handwheel to obtain a clear image of the contour of the object in the eyepiece field of view, and then move the vertical and horizontal workbenches to align.

Summarize

The microscope is composed of precision mechanical optical lens. Its design is compact, small in size, and light in weight. Therefore, it needs to pay attention to maintenance to better extend the use time of the microscope and keep it in good working condition.