THINKING IN SOLUTIONSTips and practicalinformationBalanceBalancing grade of Pokolm arborsCalculations and definitionsAdapters, extensions,collets, drill chucksArbor type ISO/BT HSKViewBalancing grade classes and typical applicationsG 0.4 e.g. ultrafine grinding machinesG 1 e.g. small motors, grinding machine drivesHollow shank taper HSKSize 30 40 50 25 32 40 50 63 100Form – – – all all all all all allGrade level 2.5 6.3 6.3 2.5 2.5 2.5 2.5 2.5 6.3G 2.5G 6.3e.g. tools, small tool arbors, electric motors, turbinese.g. tools, tool arbors, tooling machine partsSteep taper SK / BTRPM 30,000 18,000 12,000 40,000 30,000 30,000 30,000 25,000 12,000G 16e.g. large tool arbors, cardan shafts, drive shaftsWe would be glad to implement balancing grades and special requests deviating from this table – please ask our sales personnel.100.0G 40e.g. drive shafts, car wheels, crankshaft drivesFlat contact surfaceList of formulas:permitted final unbalance in [gmm/kg] or eccentricity e in [µm]10.01.0HSK 80HSK 100SK 50SK 40HSK 63 HSK 40HSK 50/SK 30/HSK 40/HSK 320.1 G 0.1HSK 25G 40G 16G 6.3G 2.5G 1Calculationof final unbalance in[gmm/kg]e = U – mTerms and dimensions:G = balancing grade in [mm/s]e = final unbalance in [gmm] or center gravity shift in [μm]ω = angular frequency (2 · π · f) in [1/s]f = frequency (n/60) in [1/s]n = speed in [U/min]Calculationof angular frequency in[1/s]ω = 2·π·n –––––60Calculationof balancing grade in[mm/s]G = e · ω = U · π · n –––––m · 30U = unbalance (m · e) in [gmm]m = rotor weight in [g]F = centrifugal force (U · ω) in [N]r = radius of unbalance in [mm]m r= final unbalance [g]Calculationof equalizing weightm r= e · m ––––rAccessoriesOrder / request formsSpindle systems / shrinktechnologyAssembly instructions5,000 10000 15,000 20,000 25,000 30,000 40,000 50,000Speed [RPM]DIN/ISO 19401011Index
