Speed step profiling / comparator switching points23111.1.4 Speed step profiling / comparator switching pointsApplication:A bore spindle should be guided to the surface of the workpiece using a rapid feed movement. The bore isthen bored to a defined depth using a considerably longer feed. When reversing the bore spindle, the unitshould travel at a slow velocity while the drill is still in the bore. The remaining travel to the idle position isperformed at a rapid speed.The bore spindle should be switched on just before the boring process commences and should be switchedoff immediately after it has been removed from the bore. Movement of the conveyor belt should be blockedfor as long as there is a risk of collision between the workpiece and drill.Assignments:2001000 position/mm1000O8O70101course command line N011: POSA 200mmspeedmm/s200 100 0position/mm1000O8O70101course command line N016: POSA 0mmspeedmm/sFunction:The feed movement is implemented using speed step profiling. The initial speed is first set to 100 mm/susing the "SPEED 100%" command (N007). This speed can be used until the start of the boring process.After a travel distance of 120 mm, the boring begins and the speed should then be 10 mm/s. The "POSR 120mm SPEED 10%" command (N011) ensures that the speed is reduced from 100 mm/s to 10 mm/s for thefollowing positioning after a distance of 120 mm. The position as of which the speed is then 10 mm/sdepends on the set braking ramp (N001) and the output speed (N007). This means that braking is initiatedfrom an appropriate stopping distance from the position where the bore starts.When returning, the initial speed is set to 50 mm/s (N012) and, as of a travel distance of 70 mm, isaccelerated to 100 mm/s (N013).The bore spindle is switched on and off with the aid of the comparator switching points. During the feedmovement, the spindle is switched on after a travel distance of 100 mm (N009). By the time the boringprocess begins after 130 mm, the spindle must have reached its operating speed. The spindle is switched offagain when returning once the drill has left the bore (N014).The conveyor belt is blocked for as long as the axis is located at a position of between 25 mm and 200 mm(N008 and N015).
