CAM-POST High Speed Machining Module
Overshoot and Undershoot Detection and Avoidance
CAM-POST HSM module calculates overshoot and undershoot by using the following four methods, all of which can be used separately or collectively:
- Feed Control Error: Is caused by the change in velocity of each axis at a corner. To eliminate this error, CAM-POST HSM specifies the maximum change in velocity for each individual axes or group of axes.
- Acceleration Error: Is caused by the force of momentum acting on the machine. CAM-POST HSM avoids this type of error by specifying a maximum permissible acceleration for each individual axes or groups of axes.
- Following Error: Is caused by the lag between the estimated machine tool position calculated by the controller as compared to the actual true position. CAM-POST HSM eliminates this error by calculating the controller acceleration time constant and the loop gain time constant to ensure that the CNC machine will not undershoot
- Overshoot Tables: Allows users to enter overshoot error information for specific NC machines at several different feed-rates. CAM-POST HSM will use the data entered in the overshoot table to calculate the maximum feed-rate limits applicable on the machine for the entire high-speed machining process.