Asynchronous orbiting
Process control by PLC
Down channel | Orbit channel | Escape channel | Escape start |
Vext =0, Vext = VGen, Use of Insert command CU for erosion on discs | Vprog | Vext | Vext < 0 and |
In asynchronous orbiting, the program flows in the down and orbit channels in parallel and independently of each other. No further synchronisation takes place between these two channels. The velocity in the channels is completely asynchronous.
A motion in the escape channel is executed at negative generator velocity and when the down channel is at standstill. When a contour is approached, the escape motion (see Superimposing geometry and escape motions) and the program progress of the down channel can be superimposed with a sliding distance. The Insert command CU can insert motion stops online in the down channel. While the down channel is at standstill, a disc is eroded due to the parallel motion of the orbit channel.
Geometry using NC programming
In this erosion mode, the geometries of the down and orbit channels are programmed independently of each other. The program example below shows the two geometries of the down and orbit channels resulting in the geometry shown in the figure.
The geometry in the down channel is programmed in the subroutine “Sinking.sub” taken from the program example of the basic structure [Standard program structure of down channel].
The geometry in the orbit channel is programmed in the subroutine “PlanetaryGeometry.sub” taken from the program example of the basic structure [Standard program structure of orbit channel].
Programming Example
Programming Example
Orbit channel - asynchronous orbiting