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Manual de usuario Jet Tools, modelo 16-32 Plus

Fabricar: Jet Tools
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With a 1/8” wrench, adjust all four studs by tightening the lock nuts (Figure 28), then loosening them 1/8 to 1/4 turn. If the lock nuts are set too tight, height control will not operate easily. If the lock nuts are too loose, excessive deflection of the outboard end of the drum carriage will result. 2. Apply lubricant to front and rear areas of motor mount slide. 3. Push height adjustment handle (Figure 28) downward to set firmly on housing. Figure 27 Figure 28 18 4. Loosen set screws on collar (Figure 28). 5. Slide collar upward against housing so that all vertical free-play of height adjustment screw is eliminated. An easy method of doing this is to use a block of wood on top of the motor mount slide and under the collar, while lowering the drum with the height adjustment handle. Lubricate around washers beneath handle and above collar. Tension Roller Alignment The infeed and outfeed rollers are tensioned to provide downward pressure on the workpiece to prevent slippage on the feed conveyor. Tension rollers are set at the factory, but should be inspected and may require adjustment as the sander receives use. Improperly adjusted tension rollers (i.e. those set too high, rendering them non-functional) could allow kick-back of pieces being sanded. 1. Unplug sander from power source and remove abrasive from drum. 2. Loosen all four hex nuts on the bearing bolts (A, Figure 29). This will allow both tension rollers to drop to their lowest position. (NOTE: Figure 29 only shows outboard end of drum. Adjustments must be made on both ends of drum.) 3. Lower sanding drum to where it contacts the conveyor bed. Then raise the sanding drum by making 3/4 turn of the height adjustment handle. 4. Tighten the four hex nuts (A, Figure 29). Both tension rollers are now positioned about 1/16” below the bottom of the sanding drum. Tension Roller Pressure Adjustment You can increase or decrease tension roller pressure by turning the screws on the tension roller brackets (B, Figures 29 & 30). Too much tension roller pressure can result in a “snipe” mark, which is identified as a visible line running across the width of the board and located approximately 2-1/4” from the end of the board. If the snipe occurs on the leading end of the board, adjust the outfeed tension roller. If the snipe occurs on the trailing end of the board, adjust the infeed tension roller. Tension roller pressure can also be adjusted by raising the height of the rollers, as follows: Figure 29 Figure 30 19 1. Repeat “Tension Roller Alignment” except raise the sanding drum only 1/4 turn of the height adjustment handle. 2. If both tension rollers are causing snipe then tighten all four hex nuts (A, Figure 29) at this position. 3. If only outfeed tension roller causes snipe, only tighten rear (outfeed) hex nuts on each end of drum at this position, then raise sanding drum another 3/4 turn of the handle. 4. Press infeed tension roller down to rest on conveyor bed and tighten front (infeed) hex nuts at this position. This process sets the tension roller assembly at an angle providing less tension pressure on the outfeed roller. Operation Before using your drum sander, review the previous pages in this manual on initial set-up and adjustment. In this section, you will learn how to operate the machine. Circuit Breaker The sander is equipped with a motor protective device (circuit breaker). The breaker will automatically shut the sander off when excessive current is consumed. If the breaker is tripped, turn the sander off and press the circuit breaker button on the motor to re-set. Basic Operating Procedure 1. Set depth of cut. 2. Start drum. 3. Start conveyor and select feed rate. 4. Start dust collection system. 5. Feed stock through machine. Setting Depth of Cut Adjusting the drum sander for the proper contact between the abrasive and the stock determines the mechanical depth of cut. It may take some experimentation to determine the proper depth of cut, given the variables of abrasive grit, type of wood, and feed rate. For best results, use scrap wood to practice sanding and to develop skill and familiarity with the machine before doing finish work. A good rule of thumb when sanding with grits finer than 80 is to lower the drum so it contacts the workpiece but drum can still be rotated by hand. When using grits coarser than 80, you can lower the drum slightly more. However, a combination of several variables will determine the proper depth of cut to use, including the following: 1. Abrasive type and grit size. 2. Width of the piece being processed. 3. Hardness of the piece. 4. Feed rate of the conveyor belt. Establishing Proper Drum Height 1. To establish drum height, position the stock to be sanded under the drum. Do NOT start drum. 2. Lower the drum to the stock thickness, making sure drum can be rotated by hand while contacting stock. Do not start drum while in contact with stock! 3. Without changing drum height, turn on conveyor and run the stock out from un...