Обший каталог Yamawa 2016 - 2017 - страница 847

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

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

R

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.

Distance of Workpiece excess feeding

Not Go gauge Over-cutting of the thread by too slow feeding

Process Opposite of excessive feeding Factors in fluencing extra material is cut at back frank.

Tap

Solutions Feed adjustment is strongly recommanded. (Use fully synchronous feed system and fixing holder) When using machines that do not have the synchronous feed system, such as drilling machine. Adjust the correct weight balance of main spindle properly. Use an axial/radial floating holder for adjustment.

over-cutting during tapping

The tap mounting condition in the holder. The condition of bored hole. The cutting oil selection. Incorrect adjustment of feed balance. Selection of the tap depending on material being cut.