Page 702 - Yamawa_European_Catalogue_YEU21

18. Selecting different tap holder combinations by machine feed system

Intro

SP The function of machine feed systems

Fully synchronous feed (Rigid) tapping system
SL

Spindle revolution and machine feed are synchronized, a perfect thread
lead and feed per revolution are realized.
PO

Feed by lead screws
ST
A better-feed condition is realized because the tap is fed by a master lead
screw shaft that has the same thread lead as this tap.
ROLL

Feed by gear

CARBIDE
The tap is fed at the same thread lead by a combinations of gears. This
creates a better-feed to thread lead condition.

LONG

HAND
TAPS Asynchronous feed system

Best used when the spindle rotation and the machine feed are set
independently, especially, if the machine feed value cannot be accurately
EG (STI)
predicted to be that of the tap thread lead.

SPECIAL
THREADS, Hydraulic or Pneumatic pressure feed system
GAUGES

Feed is controlled by a pressure regulation system which normally results in
THREAD an inaccurate feed per revolution compared to the tap thread lead.
MILLS

DIES Manual feed

Feed is controlled by operator which is difficult to keep a stable amount of
CENTER feed per revolution.
DRILLS

Technical
info

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