Husqvarna PG280 Operator's Manual

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OPERATINGEnglish – 11Handle heightsGrinding pressuresBelow matrix shows grinding pressure for each height.* Factory setting.Connect the vacuum cleanerUse a Husqvarna dust extraction system for completedust control.• Connect the dust extractor to the machine. Use a 50mm (2 inch) hose.Make sure that the filters in the vacuum cleaner are intactand clean. Pay attention to dust during operation.Grinding guide DiamondsBackgroundThe diamond segment comprises usually of twocomponents:• Diamonds (also called diamond crystals or corn).Changing the size of the diamonds or corn will changethe coarseness or fineness of the scratches after thegrinding process.• A bonding agent (metal or plastic). Powder is mixedand suspended in a metal or plastic bonding agent. Ifmetal is used as a bonding agent, the finished productis called metal-bonded or sintered diamond segment.If plastic is used as a bonding agent, the finishedproduct is called plastic-bonded diamonds orpolishing disc. By changing the hardness of thebonding agent, you can change how quickly or slowlythe diamond abrasive is worn down.General PrinciplesGeneral rules for using diamond tools when grindingfollow below. As with all rules, there are exceptions oroccasions when they do not apply.Diamond grit sizeChanging the size of the diamond grit to a smallerparticle/grit size will effect the performance of thediamond tool in the following ways:• Create a finer scratch pattern.• Increased service life of diamond tools.The opposite will occur when changing to a largerparticle/grit size.Binding agentIncreasing hardness of bond will:• Create a finer scratch pattern.• Increased service life of diamond tools.• Decrease production rate.The opposite will occur when making the metal or resinbond softer.Number of diamond tools under the machineAn increased number of tools under the machine leads to:• Reduce pressure on each individual diamondsegment - reduce wear rate on diamond segments.• Reduce load on the machine and cause the grinder todraw less current.• Create a smoother scratch pattern (particularly on softfloors).The reverse happens if you reduce the number of toolsunder the machine.Summary of diamond principlesThe diamond tools must be worn in order to give a highgrinding efficiency. The wear on diamond tools can beaffected by the following factors:• Pressure.• Hardness of bond.• Diamond grit size.• Number of segments under the machine.• Adding an additional abrasive (e.g. sand, siliconecarbide) on the floor will increase wear.Generally, the faster a diamond segment wears, the fasterthe productivity will be. By varying the above factors,changes can also be made to effect the following:• Scratch pattern.• Current draw of machine.• Flatness of floor (see next section).• Ease of operation.Hole position Handle height, mm/inchUpper 835/33Center 925/36Lower 1000/39Handleposition Low,kg/lbsHandlepositionCenter, kg/lbsHandleposition High,kg/lbs23/51 25/55* 27/60With accessory counterweight17/37 20/44 23/51