Обший каталог Yamawa 2016 - 2017 - страница 845

23. Selecting different tap holder combinations by machine feed system

Characteristics of tap self-guiding behavior

Holders aspects

r=tap’s radius, s=thread relief, t=margin width

Eccentric thread relief (no width of margin)

Compression Tension

Spring direction

Completely rigid holder type

Tap characteristics ; high cutting performance and machining performance, with little to no self-guiding features. The tap is held with no axial or radial Operation ; A fully synchronous machining system with fixed adjustment in the collet and holder. rigid holder is needed. Example : "High speed tapping" and "fully synchronous tapping."

Con-eccentric thread relief (margin and thread relief)

Adjustable spring floating holder

(Tension & Compression)

Machine feed and tap's thread lead

errors are corrected by two types of

spring system in the holder, the axial

tension direction of the tap and the

axial compression direction of the tap.

Tap ; High level of self-guidance due to suitable tap diameter margin and thread relief. The combination of nice portion of margin and chamfer relief helps to make appropriate tap guidance.

Concentric (No relief)

Tap ; A full thread land stays in contact with the thread major diameter at all times. Tap has no thread relief on major diameter, creating a high level of self-guidance even with unbalanced feeding conditions.