Общий каталог Yamawa 2022 - 2023 - страница 1232

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

1. Run out, misalignment and tap cutting in non perpendicular to holes Over-cutting at radial direction 3. Tapping with an improper feed condition over-cutting at axial direction

Tapping a non-parallel or non-perpendicular Process of over-cutting due to excessive feed Tool run out during tapping Misalignment during tapping thread to the axis of the hole.

Holder needs to beVerification ofWith cutting edge b1, cutting starts.
Axis of tapping process
holderadjusted. Tapping withholderand bored hole shouldholderholderprepared hole
run out can be observedbe lined up correctly.condition.
and checked when idleThe use of adjustable

running. Workpiece Cutting part by b1

holder with floating features will reduce this Lateral force problem. Solutions

Not Go gauge Excessive-cutting of the thread

misalignment Tap with excessive feeding

Run out Position between workpiece and tap after the tap rotates 1 turn. Excessive cutting in radial direction causes oversized internal threads. Since tapping proceeds along bored hole, Distance of in the depth of hole, oversize cutting is minimized, that is, oversize cutting in the beginning of the hole and excess feeding normal cutting in the depth of the hole. Workpiece

Excessive-cutting in the radial direction Normal internal threads

Cutting trace by b1 Not Go gauge Tap Over sized Normal internal threads Not Go

Not Go gauge internal gauge internal threads

at the beginning threads of the bore Position between workpiece and tap after the tap rotates 2 turns.

Workpiece Distance of excess feeding

2. Using a tap not suitable for the operation or a tap with dull Over-cutting caused by galling and excess cutting

cutting edge may cause galling and result in over-cutting. Tap Using an incorrect tap for a specific workpiece material Tapping process with dull edge can cause problems

Wear Welding Chipping

Select the correct Tap Flank ・Straight fluted tap The position between workpiece and tap after 3 rotations of tap. ・Spiral fluted tap Over-cutting of the thread by ・Spiral pointed tap too slow feeding

・Roll tap Not Go gauge Parallel Process Opposite of excessive

【Wear】 wear 【Welding】 【Chipping】 Workpiece Distance of

excess feeding feeding Factors in fluencing extra Selection of correct taps suitable for material being material is cut at back frank. tapped is strongly recommended. Solution: Proper use of cutting oil, confirmation of a constant for tool life

over-cutting during tapping Tap Incomplete The tap mounting condition in the holder. Torn threads occur on the thread flanks. If this thread

situation gets worse, there occur large threadOver-cutting caused byThe condition of bored hole.
collapses or incomplete threads finally bringing outgalling and excess feedingThe cutting oil selection.
oversized internal threads.IncompleteSolutions
Depending on the condition of collapsed threadsthreadFeed adjustment is strongly recommanded.Incorrect adjustment of feed balance.
such trouble tends to occur discontinuously asSelection of the tap depending on material
＊(Use fully synchronous feed system and fixing holder)
NOT-GO gouge enters.
Special attention needs to be taken so that randomWhen using machines that do not have thebeing cut.

inspection should not miss this kind of trouble. Incomplete thread synchronous feed system, such as drilling machine. Technical Inf Not Go gauge ＊Adjust the correct weight balance of main spindle

properly. ＊Use an axial/radial floating holder for adjustment.