Static indexing accuracy refers to the indexing accuracy measured by a cam in a stationary state or under no load. The static division accuracy includes the stroke of the action end, the stopping accuracy within the static zone, and the gap. The measurement method of stroke is to install an equal micrometer on the action end of the cam, rotate the cam by hand, and measure the stroke of the cam at the starting point of the indexing angle. When a dial gauge is not required to measure the stroke, a digital length gauge can be used to measure the cam stroke. When measuring the static accuracy of the retention section, even if the cam is rotated, the action output end remains stationary. The reason for the deterioration of static accuracy is due to the deflection caused in the cam retention section. Checking the deflection of the stationary section is also achieved by fixing a dial gauge at the output end and rotating the cam to read its deflection value.
In cam linkage mechanism automation, gaps will occur due to the accumulation of machining errors and the influence of assembly accuracy caused by the large number of assembly parts. To measure this gap value, rotate the cam forward and backward, and place a feeler gauge between the cam and the cam roller to measure the gap value. The clearance can be reduced by adjusting the distance between the output shaft and input shaft, as well as the accuracy of the connecting rod.
The indexing accuracy is the indexing accuracy measured during the operation of the cam mechanism or under load conditions. The residual vibration during cam retention will seriously affect the accuracy of dynamic indexing. In order to control residual vibration, it is necessary to study the rigidity, inertia, motion characteristics of the cam curve, lubrication, and input system methods of the cam output system.
In order to measure the accuracy of dynamic indexing, it is necessary to have a testing instrument with high response speed. These instruments include high-speed cameras, acceleration sensors, and laser locators. When measuring at low speeds, use an automatic calibrator