Makita DHP446 Instruction Manual
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9Position the bit at the desired location for the hole, thenpull the switch trigger. Do not force the tool. Lightpressure gives best results. Keep the tool in positionand prevent it from slipping away from the hole.Do not apply more pressure when the hole becomesclogged with chips or particles. Instead, run the tool atan idle, then remove the bit partially from the hole. Byrepeating this several times, the hole will be cleaned outand normal drilling may be resumed.Blow-out bulb (optional accessory)Fig.13After drilling the hole, use the blow-out bulb to clean thedust out of the hole.Screwdriving operationFig.14First, turn the action mode changing ring so that thearrow on the tool body points to the marking. Adjustthe adjusting ring to the proper torque level for yourwork. Then proceed as follows.Place the point of the driver bit in the screw head andapply pressure to the tool. Start the tool slowly and thenincrease the speed gradually. Release the switch triggeras soon as the clutch cuts in.CAUTION:• Make sure that the driver bit is inserted straight in thescrew head, or the screw and/or bit may be damaged.NOTE:• When driving wood screws, predrill pilot holes tomake driving easier and to prevent splitting of theworkpiece. See the chart.Nominal diameter of wood screw(mm)Recommended size of pilot hole(mm)3.1 2.0 - 2.23.5 2.2 - 2.53.8 2.5 - 2.84.5 2.9 - 3.24.8 3.1 - 3.45.1 3.3 - 3.65.5 3.7 - 3.95.8 4.0 - 4.26.1 4.2 - 4.4006421Drilling operationFirst, turn the adjusting ring so that the pointer points tothe marking. Then proceed as follows.CAUTION:• Pressing excessively on the tool will not speed up thedrilling. In fact, this excessive pressure will only serveto damage the tip of your bit, decrease the toolperformance and shorten the service life of the tool.• There is a tremendous force exerted on the tool/bitat the time of hole break through. Hold the toolfirmly and exert care when the bit begins to breakthrough the workpiece.• A stuck bit can be removed simply by setting thereversing switch to reverse rotation in order toback out. However, the tool may back out abruptlyif you do not hold it firmly.• Always secure small workpieces in a vise or with asimilar hold-down device.• If the tool is operated continuously until the batterycartridge has discharged, allow the tool to rest for15 minutes before proceeding with a fresh battery.Drilling in woodWhen drilling in wood, the best results are obtained withwood drills equipped with a guide screw. The guidescrew makes drilling easier by pulling the bit into theworkpiece.Drilling in metalTo prevent the bit from slipping when starting to make ahole, make an indentation with a center-punch andhammer at the point to be drilled. Place the point of thebit in the indentation and start drilling.Use a cutting lubricant when drilling metals. Theexceptions are iron and brass which should be drilleddry.MAINTENANCECAUTION:• Always be sure that the tool is switched off and thebattery cartridge is removed before attempting toperform inspection or maintenance.• Never use gasoline, benzine, thinner, alcohol orthe like. Discoloration, deformation or cracks mayresult.Replacing the carbon brushesFig.15Replace when they wear down to the limit mark. Keepthe carbon brushes clean and free to slip in the holders.Both carbon brushes should be replaced at the sametime. Use only identical carbon brushes.Use a screwdriver to remove two screws then removethe rear cover.Fig.16Raise the arm part of the spring and then place it in therecessed part of the housing with a slotted bitscrewdriver with a slender shaft or the like.Fig.17Use pliers to remove the carbon brush caps of thecarbon brushes. Take out the worn carbon brushes,insert the new ones and replace the carbon brush capsin reverse.Fig.18Make sure that the carbon brush caps have fit into theholes in brush holders securely. |
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