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The LAC (Load Adaptive Control) determines the moment of inertia of the rotary axis. This function continuously adjusts the feed control parameters according to the current moment of inertia of the workpiece. 
Performance test results show that LAC can significantly shorten the time of repeated processing of sub-contours at different angular positions.
LAC improves accuracy and saves time performance test LAC dynamic high
What is the effect of adjusting the control parameters according to the actual load of the machine? How can you significantly reduce the total time while significantly improving the machining accuracy? In the performance test, the LAC function (load adaptive control) showed its function: due to the LAC, the rotary table used the 15° step to perform 24 times of acceleration and deceleration, and only took 6 seconds instead of 14 second. The LAC reduced the following error of the rotary table from 11.5 arc seconds to 2.2 arc seconds.
Machine operators have always questioned these new features. This is not difficult to understand, because changing mature and reliable loops and processing methods is not easy, and it cannot be used solely by advertising. On the other hand, the hard facts prove that the situation is completely different. This is why we specifically selected the load adaptive control function (LAC) in the performance test, which shows extraordinary effects.
Load influencing factor
For machines with workpiece axes, the weight of the workpiece naturally has an effect on the machining, which is why there are usually two or three levels of load depending on the type of machine configuration. However, the load level is not accurate because the associated weight is several hundred kilograms. Therefore, the machine settings can only be approximated to the optimum value. Machine operators must manually select, which adds work steps for time-critical machining tasks.
The load level usually only considers the weight of the workpiece itself, which is obviously insufficient for a rotary table. For the rotary table, the moment of inertia is the decisive factor in the control parameters. The moment of inertia of the workpiece may vary greatly depending on the clamping method. The worst may differ by several times. It is also not helpful to choose a load level for this because it does not reflect the load status at all.
Improper setting of the control unit is a consequence of the inaccuracy of these parameters, resulting in poor suppression of interference and vibration, and therefore large errors in processing. Especially in the acceleration phase, the performance is particularly obvious. In order to minimize such errors, the dynamic performance of all axes of the machine tool is limited in the part where the load changes greatly during machining.
LAC performance test
In the performance test, the parameters of the LAC are set based on the rotary table of the conventional two-stage load standard machine. The following error of the feed axis is reduced by more than 50% and the dynamic accuracy is significantly improved. For a 50° rotary table rotation range and a feed rate of 6000 degrees/min, the following error is reduced from 11.5 to 2.2 angular seconds. For workpieces with a radius of 200 mm, the error produced by the rotary axis is reduced from 10.8 μm to 2.1 μm.
The LAC effect of indexing exercise is particularly obvious. The sub-profiles on many workpieces are often repeated at an angular position. For this type of workpiece, the simplest programming method is to program the sub-contour once and then rotate the rotary axis to process other sub-contours at an angular step. This is called Indexing processing.
In the performance test, the rotary table repeatedly rotated the workpiece by 15°. At every 15° step, the feed axis is briefly accelerated to the maximum feed rate and then decelerated immediately. With LAC, the machine's dynamic performance is significantly improved, allowing for higher accelerations and accelerations, with a 360% reduction in time per 360°. If the LAC standard setting is not used, the machine takes 14 seconds to complete the above-mentioned required indexing movement, 24 acceleration and deceleration processes, and does not actually machine the workpiece. After using the LAC's parameter settings, the indexing movement takes only 6 seconds - including the evaluation process before the start of processing.
in conclusion
The LAC function, especially for the rotary motion of the rotary table, can significantly save machining time while improving accuracy. The faster the rotational motion required for acceleration and deceleration during machining, the higher the effectiveness of the LAC. Because LAC optimizes acceleration and acceleration, it significantly reduces time.