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COMMON TAP PROBLEMS
TROUBLE CAUSE
TAP BREAKAGE 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.
TAP FAILURE
1.
TAP CUTTING TOO TIGHTLY. CUTTlNG
IN REVERSAL
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).
CHIPS CLOG-
1.
WRONG TYPE OF TAP.
GlNG FLUTES
2. INSUFFICIENT CHAMFER.
3. INCORRECT CUTTING FACE ANGLE.
4. ROUGH FLUTES.
5. FLUTES IMPROPERLY REGROUND.
6.
LACK OF LUBRICATION OR USE OF
WRONG TYPE.
STRIPPED OR
1. MISALIGNMENT.
CHIPPED TAP
THREADS
2. CARELESS HANDLING.
3. DULL TAP.
4. TAP TOO HARD.
5.
WRONG APPLICATION OF SURFACE
TREATED TAPS.
6.
IMPROPER SHARPENING OF TAP.
TORN THREADS
1.
INCORRECT CUTTING FACE ANGLE
IN TAPPED
(USUALLY TOO SMALL).
ART
2.
TAP DRILL TOO SMALL.
3. CHIPS CLOGGING FLUTES.
4.
BROKEN THREADS ON TAPS.
5.
IMPROPER RESHARPENING OF TAPS.
6.
LACK OF LUBRICANT OR USE OF
WRONG TYPE
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
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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.
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