How to Analyze Positioning Deviation in Rotary Indexers?
The self-locking function of the rotary indexer guarantees the accuracy of positioning, but when the positioning deviation exceeds the expected accuracy tolerance, where should the cause be analyzed?
Types of Positioning Deviation: Axial vs. Radial Errors
Since the positioning deviation of the rotary indexer belongs to the rotational index, there are two types: axial deviation and radial deviation. The first step is to determine what type of error the positioning deviation is, whether it is axial or radial positioning error. Once this result is determined, it is possible to determine the cause of the inaccurate positioning of the rotary indexer. For example, radial offset errors are caused by the design and manufacturing accuracy of the cam curves, or by the non-standard machining of indexing rollers and diverter output turret positioning holes (of course, the radial errors in positioning can also be caused by wear of the cam curves). When the above problems occur, we can restore the high-precision positioning accuracy of the rotary indexer by replacing the damaged parts and adjusting the corresponding input eccentric cover.
How to Diagnose Input Shaft Issues in Rotary Indexers?
In the case of ensuring the normal operation of all connected parts, from the analysis of the cause of the crossover itself, the input shaft of the rotary indexer will be loose and the positioning accuracy will deviate. For example, how to tell the cause of the input shaft when it cannot be rotated or is difficult to rotate.
First, check whether the input shaft taper bearing of the rotary indexer is worn or damaged, and secondly, check whether the input shaft oil seal is leaking, or whether the fastening screws are loose or damaged. In addition, the meshing of each output index and the input force of the rotary indexer is a single mechanical action. Therefore, under normal conditions, the rotation and force distribution of each station is theoretically homogeneous. When an abnormality occurs, you can rotate the input shaft to see if the force is uniform and whether the output turret can be driven normally.
The occurrence of the above problems can roughly determine the cause of the loosening of the input shaft, which is due to damage or wear of the input shaft taper bearing, or the loosening of the eccentric locking screw of the input shaft, and when the input shaft cannot rotate or drive the output turret, it can be confirmed that the result is due to the deformation and fracture of the output shaft indexing roller.