Makita HS300D Instruction Manual

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Contents

76. When ripping always use a rip fence or straightedge guide. This improves the accuracy of cut andreduces the chance of blade binding.7. Always use blades with correct size and shape(diamond versus round) of arbour holes. Bladesthat do not match the mounting hardware of the sawwill run eccentrically, causing loss of control.8. Never use damaged or incorrect blade washers orbolt. The blade washers and bolt were speciallydesigned for your saw, for optimum performance andsafety of operation.9. Causes and Operator Prevention of Kickback:- kickback is a sudden reaction to a pinched, bound ormisaligned saw blade, causing an uncontrolled sawto lift up and out of the workpiece toward theoperator;- when the blade is pinched or bound tightly by thekerf closing down, the blade stalls and the motorreaction drives the unit rapidly back toward theoperator;- if the blade becomes twisted or misaligned in thecut, the teeth at the back edge of the blade can diginto the top surface of the wood causing the blade toclimb out of the kerf and jump back toward theoperator.Kickback is the result of saw misuse and/or incorrectoperating procedures or conditions and can beavoided by taking proper precautions as given below.• Maintain a firm grip with both hands on the sawand position your arms to resist kickback forces.Position your body to either side of the blade,but not in line with the blade. Kickback couldcause the saw to jump backwards, but kickbackforces can be controlled by the operator, if properprecautions are taken.• When blade is binding, or when interrupting acut for any reason, release the trigger and holdthe saw motionless in the material until the bladecomes to a complete stop. Never attempt toremove the saw from the work or pull the sawbackward while the blade is in motion orkickback may occur. Investigate and takecorrective actions to eliminate the cause of bladebinding.• When restarting a saw in the workpiece, centrethe saw blade in the kerf and check that sawteeth are not engaged into the material. If sawblade is binding, it may walk up or kickback from theworkpiece as the saw is restarted.• Support large panels to minimise the risk ofblade pinching and kickback. Large panels tend tosag under their own weight. Supports must beplaced under the panel on both sides, near the lineof cut and near the edge of the panel.To avoid kickback, do support board or panelnear the cut. (Fig. 2)Do not support board or panel away from thecut. (Fig. 3)• Do not use dull or damaged blades. Unsharpenedor improperly set blades produce narrow kerfcausing excessive friction, blade binding andkickback.• Blade depth and bevel adjusting locking leversmust be tight and secure before making cut. Ifblade adjustment shifts while cutting, it may causebinding and kickback.• Use extra caution when making a “plunge cut”into existing walls or other blind areas. Theprotruding blade may cut objects that can causekickback.10. Check lower guard for proper closing before eachuse. Do not operate the saw if lower guard doesnot move freely and close instantly. Never clampor tie the lower guard into the open position. If sawis accidentally dropped, lower guard may be bent.Raise the lower guard with the retracting handle andmake sure it moves freely and does not touch theblade or any other part, in all angles and depths of cut.11. Check the operation of the lower guard spring. Ifthe guard and the spring are not operatingproperly, they must be serviced before use. Lowerguard may operate sluggishly due to damaged parts,gummy deposits, or a build-up of debris.12. Lower guard should be retracted manually only forspecial cuts such as “plunge cuts” and“compound cuts”. Raise lower guard by retractinghandle and as soon as blade enters the material,the lower guard must be released. For all othersawing, the lower guard should operate automatically.13. Always observe that the lower guard is coveringthe blade before placing saw down on bench orfloor. An unprotected, coasting blade will cause thesaw to walk backwards, cutting whatever is in its path.Be aware of the time it takes for the blade to stop afterswitch is released.14. ALWAYS hold the tool firmly with both hands.NEVER place your hand or fingers behind the saw.If kickback occurs, the saw could easily jumpbackwards over your hand, leading to seriouspersonal injury. (Fig. 4)15. Never force the saw. Push the saw forward at aspeed so that the blade cuts without slowing.Forcing the saw can cause uneven cuts, loss ofaccuracy, and possible kickback.16. Use extra caution when cutting damp wood,pressure treated lumber, or wood containingknots. Adjust speed of cut to maintain smoothadvancement of tool without decrease in blade speed.17. Do not attempt to remove cut material when bladeis moving. Wait until blade stops before graspingcut material. CAUTION: Blades coast after turn off.18. Avoid Cutting Nails. Inspect for and remove allnails from lumber before cutting.19. Place the wider portion of the saw base on thatpart of the workpiece which is solidly supported,not on the section that will fall off when the cut ismade. As examples, Fig. 5 illustrates the RIGHTway to cut off the end of a board, and Fig. 6 theWRONG way. If the workpiece is short or small,clamp it down. DO NOT TRY TO HOLD SHORTPIECES BY HAND! (Fig. 5 & 6)20. Before setting the tool down after completing acut, be sure that the lower guard has closed andthe blade has come to a complete stop.21. Never attempt to saw with the circular saw heldupside down in a vise. This is extremely