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Arbor and adapter systems

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THINKING IN

THINKING IN SOLUTIONSBalance error and balancingDefinition of balance errorRotational axis ≠ mass axisRotational axis = mass axisIf the mass axis of a rotating part is not the same as its rotational axis, this is considered a balance error.What can cause a balance error?• Changeover positioning corner in SK and HSK• Driving slots for SK and BT• Driving slots for HSK Form A, C, CE• Weldon surfaces on shank• Straining screws for e.g. Weldon• Uneven pitch on milling bodies• Collets and collet nuts• Production tolerancesWhen balancing a tool arbor, a balance error is compensated for either by adding compensating boresor adding material (see image: balancing by adding compensating bores).Unbalanced arborBalanced arbor withcompensating boreBalancing by addingcompensating boresExample calculations anddetailed diagram on the nextpage.12

Tips and practicalinformationExample calculationAdapters, extensions,collets, drill chucksHSK shrink fit arbor, 50 08 A63 S | weight: 760gTaper radius: 31.5 mm | balancing grade G 2.5 at 25,000 RPMHollow shank taper HSKG =U · 2 · π · nm · 60<=> U =G · m · 602 · π · nSteep taper SK / BTU =e =2,5 · 760 · 602 · π · 25,0000.726760=> U = 0.726 gmm=> e = 0.96 μmFlat contact surfaceRemarks on the diagram: “S” = Mass axisAccessoriesCalculation of remaining unbalanced mass based on the example above:m r=m · er760 · 0.00096=> m r= => m r=31.50.023gFine balancing of the arbor, therefore, minimizes the remaining unbalanced mass to 0.023 g(based on the arbor taper radius of 31.5 mm).Your advantages – Why this issue is so important.Balancing, in particular in conjunction with a high level of concentricity, reduces centrifugal forces and protects the machine spindle byreducing vibrations. This results in a very smooth-running tool, significantly increasing machining and workpiece quality, and facilitatingbetter cutting parameters – both in HSC and conventional machining.Order / request formsSpindle systems / shrinktechnologyAssembly instructionsIndex13

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Pokolm Frästechnik GmbH & Co. KG | Adam-Opel-Straße 5 | 33428 Harsewinkel | Germany | +49 5247 93610 | info@pokolm.com | www.pokolm.de