COMMON TAP PROBLEMS

32

TROUBLE

TAP BREAKAGE

TAP FAILURE IN REVERSAL

CHIPS CLOG- GlNG FLUTES

STRIPPED OR CHIPPED TAP THREADS

TORNTHREADS INTAPPED ART

CAUSE

1.WRONG TYPE OF TAP.

2.DULL TAP.

3.TAP INCORRECTLY GROUND.

4.TAP DRILL TOO SMALL.

5.DRILLED HOLE TOO SHALLOW.

6.MISALIGNMENT OF TAP AND HOLE.

7.WRONG MACHINE.

6.INCORRECT FIXTURE OR HOLDING DEVICE.

9.WORK HARDENED MATERIAL.

10.LACK OF LUBRICANT OR USE OF WRONG TYPE.

1.TAP CUTTING TOO TIGHTLY. CUTTlNG

FACE ANGLE SHOULD BE INCREASED.

2.TAP GALLING. FACE ANGLE ON BACK OF LAND SHOULD BE INCREASED.

3.CHIPS WEDGED BETWEEN FLUTES (SEE THE FOLLOWING).

1.WRONG TYPE OF TAP.

2.INSUFFICIENT CHAMFER.

3.INCORRECT CUTTING FACE ANGLE.

4.ROUGH FLUTES.

5.FLUTES IMPROPERLY REGROUND.

6.LACK OF LUBRICATION OR USE OF WRONG TYPE.

1.MISALIGNMENT.

2.CARELESS HANDLING.

3.DULL TAP.

4.TAP TOO HARD.

5.WRONG APPLICATION OF SURFACE TREATED TAPS.

6.IMPROPER SHARPENING OF TAP.

1.INCORRECT CUTTING FACE ANGLE (USUALLY TOO SMALL).

2.TAP DRILL TOO SMALL.

3.CHIPS CLOGGING FLUTES.

4.BROKEN THREADS ON TAPS.

5.IMPROPER RESHARPENING OF TAPS.

TROUBLE

TAP STICKING OR BINDING

EXCESSIVE TAP WEAR

CUTTING FACE BREAKDOWN

OVERHEATING OF TAP

POOR FINISH DN THREAD IN TAPPED PART

EXCESSIVE FRICTION DRAG AND POWER REQUIREMENT

CAUSE

1.TAP DRILL TOO SMALL.

2.TAP LANDS TOO WIDE.

3.INCORRECT CUTTING FACE ANGLE.

4.LACK OF LUBRICANT OR USE OF WRONG TYPE.

5.SURFACE TREATMENT (LUBRICANT) REQUIRED.

1.MATERIAL IS ABRASIVE OR INCLU- SIONS PRESENT. SURFACE TREATED TAP REQUIRED.

2.MISALIGNMENT.

1.INCORRECT CUTTING FACE ANGLE.

2.SURFACE TREATMENT REQUIRED.

1.EXCESSIVE LAND WIDTH.

2.LACK OF LUBRICANT OR USE OF WRONG TYPE.

3.DULL TAP.

4.EXCESSIVE FLANK CONTACT, PITCH DIAMETER RELIEF REQUIRED.

5.EXCESSIVE TAPPING SPEEDS.

1.PITCH DIAMETER RELIEF REQUIRED.

2.INCORRECT CUTTING FACE ANGLE, USUALLY TOO SMALL.

3.TAP DRILL TOO SMALL.

4.INSUFFICIENT NUMBER OF CHAM-

FERED THREADS.

I

1.PITCH DIAMETER RELIEF REQUIRED.

4.INCORRECT CUTTING FACE ANGLE.

5.INCORRECT TAPPING SPEED.

6.LACK OF LUBRICANT OR USE OF WRONG TYPE.

7.INCORRECT OR INADEQUATE EQUIP- MENT.

8.MISALIGNMENT.

6.LACK OF LUBRICANT OR USE OF WRONG TYPE

31

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Ingersoll-Rand 8658-B()-() and 8659-B()-(), 8656-B()-(), 8657-B()-(), 8655-B()-() manual Common TAP Problems
Page 30 Page 32

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