The difference between manual VMS and automatic VMS

Video measuring systems is a qualitative leap based on the measuring projector. It has upgraded the industrial measurement method from the traditional optical projection alignment to the computer screen measurement based on the era of digital imaging. It is worth mentioning that there is a transitional product on the market that has both a digital display and a computer. Strictly speaking, this kind of equipment that only uses a computer as an aiming tool is not an image measuring instrument, but can only be called an "image measuring projector" or an "image alignment projector". In other words: video measuring systems relies on the computer screen measurement technology and powerful spatial geometry calculation software. Video measuring systems are divided into digital image measuring instruments (also known as CNC vms) and hand-cranked image measuring instruments. The differences between them are mainly manifested in the following aspects:

Digital technology has achieved a little bit:

The operation of the hand-cranked image measuring instrument to measure the distance between points A and B is: first shake the handle in the X and Y directions to align with point A, then lock the platform, change hands to operate the computer and click the mouse to confirm; then open the platform , Crank your hand to point B, repeat the above actions to confirm point B. Each click of the mouse is to read the optical scale displacement value of the point into the computer, and the calculation function can only be operated after all the points have been read in.... This kind of elementary equipment is like a technical "building block platter", all functions and operations are carried out separately; once shake the handle, and then click the mouse...; you need to pay attention to the evenness and lightness and slowness of the hand, without turning; Generally, it takes a few minutes for a skilled operator to perform a simple distance measurement.

The digital image measuring instrument is different. It is based on micron-level numerical control hardware and humanized operating software, and integrates various functions to become a truly modern precision instrument. It has basic abilities such as stepless speed change, soft motion, point walking, electronic lock, synchronized reading; after the mouse moves to find the two points A and B you want to measure, the computer will help you calculate the measurement result and display the graph for Calibration, image and shadow synchronization, even for beginners to measure the distance between two points only a few seconds.

Digital technology realizes the free placement of workpieces:

When the hand-cranked image measuring instrument performs reference measurement, it is necessary to rotate the index plate on the loading platform to adjust the reference edge of the part to a coordinate axis parallel to the platform, because its primary software cannot support extremely complex spaces. Geometric conversion. The digital image measuring instrument can use software technology to complete the complex conversion between spatial coordinate system rotation and multiple coordinate systems. The measured workpiece can be placed at will, the coordinate origin and reference direction can be established at will, and the measured value can be obtained. At the same time, a mark is displayed on the screen. , The coordinate direction and measuring point can be seen intuitively, making the common reference distance measurement very simple and intuitive. Since then, the product of the mechanical era of the indexing plate has become history together with the crank.

Digital technology realizes real-time correction of errors:

In the process of finding the target point to complete the measurement displacement of the hand-cranked image measuring instrument, due to the manual operation, a certain offset will occur between the main and auxiliary guide rails of the mobile platform, and the continuous back and forth movement will also produce a return gap. When measuring at the micron level, it will directly affect the measurement accuracy. The digital image measuring instrument has the ability to lock in motion and adopts the technology of no backlash in the design, thereby eliminating these errors and improving the smoothness of motion and measurement accuracy.

The longer the measurement distance, the greater the error, and the measurement accuracy decreases with the length. The hand-cranked image measuring instrument does not have the non-linear real-time correction function, and cannot eliminate the non-linear error caused by environmental factors such as temperature and vibration. The digital image measuring instrument has a very good error correction ability, which is corrected by software calculation and real-time control based on a strict mathematical model, so that the nonlinear error is reduced to a small amount, the measurement accuracy is improved, and the technical bottleneck of speed and accuracy is broken.

Digital technology can carry out CNC rapid measurement:

When the hand-cranked image measuring instrument performs batch measurement of the same workpiece, it needs to be manually moved one by one. Sometimes it has to shake tens of thousands of laps, but it can still only complete limited measurement of dozens of complex workpieces. Work efficiency low.
The digital image measuring instrument can establish CNC coordinate data through sample measurement, drawing calculation, CNC data import, etc., and the instrument will automatically move to the target point one by one to complete various measurement operations, thereby saving manpower and improving efficiency. With dozens of times the working capacity of a hand-cranked image measuring instrument, the operator is relaxed and efficient.

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