What is gap compensation-machine tool,CNC mill

What is gap compensation?

The intrinsic characteristic of the machine tool is the reaction. The space in the joint between adhesion, friction and elasticity and rotating machinery is the result of it, such as the ball screw. We compensate the fpc4 scanner, in the X and Y direction, and we are opposed to a consistent method. Fpc4 assembles a Mosaic of the capture algorithm always such that it is always close to each photograph and positive X and Y axis movement so that the machine can be rebound from fpc5 can be effectively isolated

We can look at figure 8. What is the gap compensation algorithm?

In figure 9. By reducing the field of view, the numerical control scanner simulates a distant lens system and improves the orthographic property of the image. This can be seen from improved splicing, especially those features, above or below the focal plane.

Calibrate the image with the numerical control motion.

Usually, we calibrate the image by placing a reference scale in the image field.

However, the unique fpc2 scanner, if you want to scale the image, can be achieved through the movement of the CNC mill. During execution, this method is simpler and more accurate because the resolution is equal to the resolution of the mill.

When the scan object is not convenient to place the reference scale, it is particularly convenient to move the zoom, only the recognition point feature is needed. We know that this could be a corner, a center of a hole, or even a bit of corrosion or abrasion on the surface of the object.

We can also measure the angular error by means of motion, and the effect can be automatically corrected in each image

Let’s look at figure 10. When calibrating the image size we use known linear dimensions.

Figure 11. The calibration of our image scale is accomplished by the precision mechanical movement. And identifiable point moving distance is within the microscope’s field of view of mobile Δ X Y is a known distance. The position change and the actual motion of the machine are both observed by the fpc2 scanner and used to determine the scale.

What is the effect of the depth of field

Explanation: not surprisingly, the benefits is to increase the pixel density can improve the accuracy, although it is a price, the price of it is a larger data file size and longer time to scan. In carefully designed experiments, the ability to accurately measure dimensions in a numerical control scanner is optimized, which is superior to plus or minus 0.001.

Let’s look at figure 16 below. Fpc2 scan precision verification data.

What is the effect of the depth of field?

For image collection, we use a 10% view, and our series of scans is collected from 2.5 d geometry. After each scan, the camera refocuses, and it typically focuses on a new focal plane. Then, in each of the results, the same round features were measured. The relationship between the measurement of diameter measured on the plane and the distance of the focal plane is shown in figure 17.

Explanation: if it is within a small field of vision, fpc2 scanner as a telecentric lens simulation is there, it’s performance has been pretty steady, in this case, the “change” in the depth of the focal plane 0.300 shown in less than 0.002 “change”.

What is the source of the error?

In these measurements, we can see there are a number of error sources, including some of the error and the error is introduced in choosing a distance, and the error is in the scanner fpc3 measurement. The responsibility of the user is to explain the exact location of the edges based on the contrast of pixels. System error is introduced from the limitation of fpc4 positioning repeatability. We know that fpc5 minimum discrete positioning movement 0.0001 “; Shaft drive, however, the influence of other factors in the system (precision ball screw, friction, wind, etc.) are we considered, so we need know positioning repeatability of 0.001 “, or better, decided it was in the fpc2 scanner from introducing a single optical mechanical error. Like any microscope, if you are in the fpc2 scanners used in optical instruments, can lead to something about the image distortion, this situation is caused by some lens distortion, at the same time, can also affect the curvature of field effect.