Makita 4101RH Instruction Manual

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57. The arbour size of wheels and flanges mustproperly fit the spindle of the power tool.Wheels and flanges with arbour holes that do notmatch the mounting hardware of the power toolwill run out of balance, vibrate excessively andmay cause loss of control.8. Do not use damaged wheels. Before each use,inspect the wheels for chips and cracks. If powertool or wheel is dropped, inspect for damage orinstall an undamaged wheel. After inspecting andinstalling the wheel, position yourself andbystanders away from the plane of the rotatingwheel and run the power tool at maximum no loadspeed for one minute. Damaged wheels willnormally break apart during this test time.9. Wear personal protective equipment.Depending on application, use face shield,safety goggles or safety glasses. Asappropriate, wear dust mask, hearingprotectors, gloves and shop apron capable ofstopping small abrasive or workpiecefragments. The eye protection must be capableof stopping flying debris generated by variousoperations. The dust mask or respirator must becapable of filtrating particles generated by youroperation. Prolonged exposure to high intensitynoise may cause hearing loss.10. Keep bystanders a safe distance away fromwork area. Anyone entering the work areamust wear personal protective equipment.Fragments of workpiece or of a broken wheel mayfly away and cause injury beyond immediate areaof operation.11. Hold the power tool by insulated grippingsurfaces only, when performing an operationwhere the cutting accessory may contacthidden wiring or its own cord. Cuttingaccessory contacting a "live" wire may makeexposed metal parts of the power tool "live" andcould give the operator an electric shock.12. Position the cord clear of the spinningaccessory. If you lose control, the cord may becut or snagged and your hand or arm may bepulled into the spinning wheel.13. Never lay the power tool down until theaccessory has come to a complete stop. Thespinning wheel may grab the surface and pull thepower tool out of your control.14. Do not run the power tool while carrying it atyour side. Accidental contact with the spinningaccessory could snag your clothing, pulling theaccessory into your body.15. Regularly clean the power tool’s air vents. Themotor’s fan will draw the dust inside the housingand excessive accumulation of powdered metalmay cause electrical hazards.16. Do not operate the power tool near flammablematerials. Sparks could ignite these materials.Kickback and related warningsKickback is a sudden reaction to a pinched or snaggedrotating wheel. Pinching or snagging causes rapidstalling of the rotating wheel which in turn causes theuncontrolled power tool to be forced in the directionopposite of the wheel’s rotation at the point of thebinding.For example, if an abrasive wheel is snagged or pinchedby the workpiece, the edge of the wheel that is enteringinto the pinch point can dig into the surface of thematerial causing the wheel to climb out or kick out. Thewheel may either jump toward or away from the operator,depending on direction of the wheel’s movement at thepoint of pinching. Abrasive wheels may also break underthese conditions.Kickback is the result of power tool misuse and/orincorrect operating procedures or conditions and can beavoided by taking proper precautions as given below.a) Maintain a firm grip on the power tool andposition your body and arm to allow you toresist kickback forces. Always use auxiliaryhandle, if provided, for maximum control overkickback or torque reaction during start-up.The operator can control torque reactions orkickback forces, if proper precautions are taken.b) Never place your hand near the rotatingaccessory. Accessory may kickback over yourhand.c) Do not position your body in line with therotating wheel. Kickback will propel the tool indirection opposite to the wheel’s movement at thepoint of snagging.d) Use special care when working corners,sharp edges etc. Avoid bouncing and snaggingthe accessory. Corners, sharp edges or bouncinghave a tendency to snag the rotating accessoryand cause loss of control or kickback.e) Do not attach a saw chain, woodcarvingblade, segmented diamond wheel with aperipheral gap greater than 10 mm or toothedsaw blade. Such blades create frequent kickbackand loss of control.f) Do not “jam” the wheel or apply excessivepressure. Do not attempt to make an excessivedepth of cut. Overstressing the wheel increasesthe loading and susceptibility to twisting or bindingof the wheel in the cut and the possibility ofkickback or wheel breakage.g) When wheel is binding or when interruptinga cut for any reason, switch off the power tooland hold the power tool motionless until thewheel comes to a complete stop. Never attemptto remove the wheel from the cut while thewheel is in motion otherwise kickback mayoccur. Investigate and take corrective action toeliminate the cause of wheel binding.