AbrasiveWJ CuttingUsed to cut much harder materialsWater is not used directly to cut material as in Pure,instead water is used to accelerate abrasive particleswhich do the cutting8o-mesh garnet (sandpaper) is typically used though50 and 120-mesh is also usedStandoff distance between mixing tube and workpartis typically 0.010-0.2oo - important to keep to aminimum to keep a good surface finish
Abrasive WJ Cutting Used to cut much harder materials Water is not used directly to cut material as in Pure, instead water is used to accelerate abrasive particles which do the cutting 80-mesh garnet (sandpaper) is typically used though 50 and 120-mesh is also used Standoff distance between mixing tube and workpart is typically 0.010-0.200 – important to keep to a minimum to keep a good surface finish
Abrasive WJ Cutting cont.Evolution of mixing tubeInletWatertechnologyStandard Tungsten Carbidelasts 4-6 hours (not used muchJewelanymore)-AbrasivePremium Composite Carbidelasts 100-150 h0ursConsumables include water,Guardabrasive, orifice and mixingMixingTubetube
Abrasive WJ Cutting cont. Evolution of mixing tube technology Standard Tungsten Carbide lasts 4-6 hours (not used much anymore) Premium Composite Carbide lasts 100-150 hours Consumables include water, abrasive, orifice and mixing tube
TolerancesTypically +/- 0.005 inchMachines usually have repeatability of o.ooi inchComparativelytraditional machining centers can holdtolerances of o.oooi inch with similar repeatabilityWJ tolerance range is good for many applicationswhere critical tolerances are not crucial to workpartdesign
Tolerances Typically +/- 0.005 inch Machines usually have repeatability of 0.001 inch Comparatively traditional machining centers can hold tolerances 0f 0.0001 inch with similar repeatability WJ tolerance range is good for many applications where critical tolerances are not crucial to workpart design