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-30 G0449/G0450 37" Drum Sander To adjust V-belt tension: 1. Disconnect power to the sander! 2. Open the side cover. 3. Turn the motor mount nuts in the direction shown in Figure 30 to loosen or tighten the V-belts. - - - - Pulley Alignment Pulley alignment is another important factor in power transmission and belt life. The pulleys should be parallel to each other and in the same plane (coplaner) for optimum performance. Each pulley can be adjusted by loosening the set screw that secures the pulley to the shaft, sliding - - -31 G0449/G0450 37" Drum Sander Conveyor Tensioning & Tracking Tools Needed: Qty Wrench 19mm ................................................... 1 Tensioning The conveyor may slightly stretch with continued use and will eventually need to be tensioned. This is most obvious if the conveyor starts slipping on the rollers. When you tension the conveyor, focus on tensioning the adjustment bolts in even increments. Tensioning one side more than the other will cause tracking problems, which will require you to take additional steps to get the sander operating correctly. To tension the conveyor: 1. Loosen the lock nut, shown in Figure 32, on both sides of the conveyor. Lock Nut Adjustment Bolt Figure 32. One side of conveyor tensioning & tracking controls (guard removed for clarity). 2. Use a magic marker, white out, or fingernail polish to mark the front of the conveyor tensioning bolt on both sides. This step will aid you in keeping track of the rotations as you turn the bolts, so they remain as even as possible. 3. Turn both of the conveyor adjustment bolts clockwise one full turn at a time until the conveyor belt no longer slips during operation. —If the conveyor starts tracking to one side, immediately turn the drum sander OFF and perform the tracking instructions. 4. Tighten the lock nuts to lock the conveyor adjustment bolts in place. Tracking The conveyor must track straight. If the conveyor tracks to either side, then the tracking must be corrected or the conveyor will become damaged and have to be replaced. Replacing a damaged conveyor is a big job. Always be careful to make sure that the belt does not travel too far to one side or the other. Tracking the conveyor is a balancing process that takes patience and a small degree of trial-anderror. Usually you must over-tighten the loose side (the side the belt is tracking towards) to make the conveyor move to the middle of the rollers, then loosen that same side to make the conveyor stay in position. If you adjust the bolt too much either way, then you have to repeat the process until the conveyor rides in the middle and stays there during continuous operation. To track the conveyor: 1. Turn the conveyor ON and watch it track. 2. Determine which side the conveyor is tracking towards (the loose side) and tension the adjustment bolt on that side until the conveyor tracks in the opposite direction. Note: Tracking changes may take up to three minutes before they are noticeable. 3. When the conveyor is near the middle of the rollers or table, loosen the adjustment bolt until the conveyor stops moving and tracks straight. —If the conveyor tracks too far to the other side, then adjust the bolt as necessary to bring it back and repeat Steps 2 & 3 until the tracking is correct. -32 G0449/G0450 37" Drum Sander Drum Adjustments Tools Needed: Qty Hex Wrench 5mm.............................................. 1 Hex Wrench 4mm.............................................. 1 Wrench 19mm ................................................... 1 Wrench 10mm ................................................... 1 Wrenches/Sockets 14mm ................................. 2 Measuring Tape ................................................ 1 Gauge Blocks (see Page 30)............................ 2 Feeler Gauge Set..............................................1 When adjusting the drums, they must be aligned in two ways—perpendicular to the feed direction (Figure 33) and parallel to the conveyor belt (Figure 34). In addition, the rear drum should be set approximately 0.020" (0.5 mm) below the front drum. (This amount is equal to one full crank of the handwheel.) ....................... ................. Figure 33. Drum perpendicular to feed direction. .................................................. Figure 34.Drum parallel to conveyor belt. G0449/G0450 37" Drum Sander The drums can be adjusted in fine increments at the pillow bearings and in larger increments by using the table lift screws (Page 27). While adjusting the drums, keep in mind that having the drums parallel to the conveyor belt is critical to the sanding operation. Care should be taken to make the tolerances as close as possible (within 0.002" from one side to the other) when adjusting the drum heights. The tolerances for having the drum perpendicular to the feed direction are much more forgiving, even allowing up to 1.8" difference from one side to the other before causing problems. To align the drums: 1. ...