Общий каталог Yamawa 2021 - страница 699

18. Selecting different tap holder combinations by machine feed system

SP The function of machine feed systems

SL

PO

Fully synchronous feed (Rigid) tapping system

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

ST

ROLL

CARBIDE

LONG

Feed by lead screws

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.

Feed by gear

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

HAND TAPS

EG (STI)

SPECIAL THREADS, GAUGES

THREAD MILLS

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 predicted to be that of the tap thread lead.

Hydraulic or Pneumatic pressure feed system

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

DIES Manual feed

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