Обший каталог Yamawa 2016 - 2017 - страница 847

24. The mechanism for a tap to cut over size on an internal thread


Description of products
3. Tapping with an improper feed condition over-cutting at axial direction
Process of over-cutting due to excessive feed
With cutting edge b1, cutting starts.

Not Go gauge
Workpiece Cutting part by b1


Excessive-cutting of the thread
Tap with excessive feeding


direction of tapping
Position between workpiece and tap after the tap rotates 1 turn.
Distance of
excess feeding
Workpiece


Cutting trace by b1
Tap

Position between workpiece and tap after the tap rotates 2 turns.


Workpiece Distance of
excess feeding


Tap


The position between workpiece and tap after 3 rotations of tap. Not Go gauge
Over-cutting of the thread by
too slow feeding
Distance of
Workpiece excess feeding
Process Opposite of excessive
feeding Factors in fluencing extra
material is cut at back frank.
direction of tapping


Tap over-cutting during tapping
The tap mounting condition in the holder.
The condition of bored hole.
Solutions The cutting oil selection.
Feed adjustment is strongly recommanded.
Incorrect adjustment of feed balance.
(Use fully synchronous feed system and fixing holder)
Selection of the tap depending on material
Information


When using machines that do not have the
Technical


being cut.
synchronous feed system, such as drilling machine.
Adjust the correct weight balance of main spindle
properly.
Use an axial/radial floating holder for adjustment.


Technical-72
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