Page 703 - Yamawa_European_Catalogue_YEU21

18. Selecting different tap holder combinations by machine feed system

Intro

Characteristics of tap self-guiding behavior
Holders aspects
SP
r=tap’s radius, s=thread relief, t=margin width

Eccentric thread relief
(no width of margin)
SL

Compression Tension
Axial Floating s=thread relief
Spring direction
PO

Completely rigid holder type ST

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

CARBIDE

Con-eccentric thread relief
(margin and thread relief)
LONG

t=margin width
s=thread relief
HAND
TAPS
Adjustable spring floating holder
(Tension & Compression)
EG (STI)
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
Machine feed and tap's thread lead
SPECIAL
errors are corrected by two types of THREADS,
spring system in the holder, the axial GAUGES
tension direction of the tap and the Concentric (No relief)
axial compression direction of the tap.
THREAD
MILLS
r=tap’s radius

DIES

CENTER
Tap; A full thread land stays in contact with the thread DRILLS
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.
Technical
info

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