Blind holes - An explanation

Blind holes are often used in conjunction with 3-point inside micrometers to make accurate measurements of inside diameters in recesses or blind holes.

The 3-point inside micrometer is a precision tool designed specifically for measuring inside diameters. It consists of three measuring surfaces arranged evenly around the circumference of the screw. These measuring surfaces adapt to the inner contour of the workpiece and enable precise measurements.

When using 3-point internal micrometers in blind holes, it is important that the micrometer is fully inserted into the hole to obtain accurate results. The three measuring surfaces of the screw should be in contact with the inner walls of the hole to measure the diameter correctly.

Measuring with 3-point internal micrometers allows higher accuracy than other measuring methods such as calipers. The roundness of the bore is taken into account due to the even distribution of the measuring surfaces, which leads to more precise results.

It is important that the blind hole has sufficient depth to accommodate the entire length of the 3-point inside micrometer. Care should also be taken to ensure that the measuring surfaces are clean and free from dirt or damage to ensure accurate measurements.

The combination of blind holes and 3-point inside micrometers allows accurate measurement of inside diameters in recesses and blind holes. This is particularly important in industries such as automotive, aerospace and mechanical engineering where tight tolerances and high precision are required.

Why do 3-point inside micrometers offer higher accuracy compared to other measuring methods?

3-point inside micrometers offer higher accuracy compared to other measuring methods due to their special design. The three measuring surfaces are arranged evenly around the circumference of the screw and adapt perfectly to the inner contour of the workpiece. This takes the roundness of the hole into account, which leads to more precise measurement results. In contrast, other measuring methods such as calipers cannot provide the same even distribution of measuring surfaces and are therefore more prone to measuring errors. The precise placement and matching of the 3-point inside micrometer to the inside walls of the hole allows for a more accurate measurement of the diameter and therefore a higher accuracy overall.

What is a blind hole?

A blind hole is a special type of hole that does not penetrate the entire component, but instead reaches a predetermined depth. Blind holes come into play when the workpiece has a significant thickness or when drilling all the way through is not necessary. In addition, for design reasons, there may be a desire to do without a through-hole or it may even be impossible under certain circumstances.