Каталог оснастка Dormer Pramet 2016 - страница 269

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QUICK-CHANGE TAPPING CHUCKS  The process of tapping is a complex balance of rota- the leading or trailing flanks of the tap may be forced tional and axial movements of the tool. It is sometimes to progressively “shave” one flank of the component necessary to restrict the axial movements of the tool. thread, thus producing a thin and oversize thread in If the axial movement is not accurately controlled, the component. DIN 69871 Tension – forward float capability allows the tap to progress into the component without interference from ISO 60 the axial feed of the machine spindle. MA S 403 BT Compression – backward float capability, acts as a cushion and allows the tap to commence cutting at its DIN 2080 own axial feed independent of the machine spindle. HSK-A Compression/Tension – float is designed to negate any external forces during the machining operation. VDI MORSE Radial float – allows for slight misalignment of the machine spindle axis and hole axis prior to tapping. This is not recommended manufacturing practice and should be avoided. 268