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15 AutoMill SC Motion Control Upgrade P R O D U C T M A N U A L EN Figure 18 2.6. Material Conveyors Chain Tensioners The AutoMill SC Motion Control Upgrade utilizes two mechanical chain tensioners for the material conveyors instead of spring loaded chain tensioners. The mechanical chain tensioner reduces the backlash and gives a more accurate position for the material conveyors (Figure 19). Figure 19 2.4. Pop up Dog Actuation The AutoMill SC Motion Control Upgrade utilizes proximity sensors instead of timing based limit switches to actuate the pop up dogs. Upgrading to proximity sensors improves outfeed lumber catcher control. Table 6: Pop up dog actuation components (refer to Figure 17) No. Item 1 Proximity Sensor 2 Sensor Cable Figure 17 2.5. Board Counters The AutoMill SC Motion Control Upgrade utilizes two proximity sensors instead of limit switches to count boards. Upgrading to proximity sensors improves the accuracy of tracking a board through the saw. Table 7: Board counter senor components (refer to Figure 18) No. Item 1 Proximity sensor 2 Sensor guard/mount 3 Mounting bracket 4 Sensor Cable