269 Каталог PRAMET 2016 Инструментальная оснастка для металлорежущих станков Стр.268

Каталог PRAMET 2016 Инструментальная оснастка Стр. 268 0269 Lab2u

QUICK-CHANGE TAPPING CHUCKS The process of tapping is a complex balance of rotational and axial movements of the tool. It is sometimes necessary to restrict the axial movements of the tool. If the axial movement is not accurately controlled, the leading or trailing flanks of the tap may be forced to progressively "shave" one flank of the component thread, thus producing a thin and oversize thread in the component. Tension - forward float capability allows the tap to progress into the component without interference from the axial feed of the machine spindle. Compression - backward float capability, acts as a cushion and allows the tap to commence cutting at its own axial feed independent of the machine spindle. Compression/Tension - float is designed to negate any external forces during the machining operation. 268