Continuous camshaft rotation which is used in fast applications when the machine cycle is carried out in one revolution of the main shaft. Each single work operation is synchronised within a particular sector of main shaft rotation. This type of operation is indicated for machines whose motions are actuated only by mechanical drives. 2. Operation By electrical control which is used in all applications when a long dwell time is required owing to the length of the industrial production times necessary. By this means of operation, stopping is controlled by a microcam mounted on the table input shaft. This actuates a industrial limit switch causing the self-braking motor to stop or a clutch-brake group to disengage during the mechanical dwell period of the cam. The table starting up signal, which initiates transition to the next station followed by halting at that station, is sent only at the end of all the operations necessary to complete the work required. On RIGIDIAL tables, except for those with 20-24-32 stations, a full cycle is usually obtained by one full turn of the input shaft or the cam. The “Indexing period”, indicated by “B” degrees, is the angle of rotation of the camshaft which moves the output plate from one station to the next. The remaining part of one camshaft revolution, locks the output plate motionless exactly in station. This is the “dwell period Bp” Depending on its speed of rotation, the cam indexing and dwell periods determine the indexing and the dwell times of the indexing cycle, respectively. There are two ways to use RIGIDIAL indexing tables:

GLOBOIDAL CAM INDEXING TABLES

1. General RIGIDIAL, the new range of globoidal cam indexing tables with globoidal cams, which transforms continuous rotary motion into indexing motion, was designed to achieve top performance at a low price. The indexing plate is supported by a large crossed industrial roller bearing that can withstand considerable axial and tilting loads while retaining high levels of accuracy and rigidity. The precision cam is nitrided and assures wear resistance, smooth running, regular motion, accurate positioning and absence of any backlash at the station. The accurately designed cams make it possible to obtain a wide range of standard motions including the 2-station device (180 deg. rotation) ideal for tilting or workpiece change applications. The sealed cast aluminium box features good application adaptability in restricted spaces and the possibility to be mounted in any position. On demand, the table may be provided with a central through hole for the purpose of connecting electrical and hydraulic service lines to the indexing table. Alternatively, it may have a fixed centre post. RIGIDIAL indexing tables with self-braking gearmotor come fitted with a clutch torque limiter in the standard version. Its purpose is to protect the table against damage caused by jams etc. whilst in motion.

0sva360°

Fig. 1 Example of SVA (Displacements, Velocities, Accelerations) diagram
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