Page 434 - DC_SWISS(Catalogue_TM_ES-EN)

APPLICATION AND USE OF THREADING TAPS

Problem Causes Solutions

Partial chipping Swarf jamming Check cutting speed.
of tap Use alternative tap type (K / N.62.-3 / Z.70VS).
Tap hits bottom of core hole Check hole and thread depths.
Drill core hole deeper.
Irregular workpiece material structure Adjust cutting speed.
Improve lubricating quality of coolant.
Use tap with other cutting geometry / other
coating.
Tap incorrectly re-ground (lead-in diameter too Ensure that original values are maintained when
small, therefore too few cutting teeth) re-grinding.

Problem Causes Solutions

Excessive tap Incorrect cutting speed Adjust cutting speed to suit workpiece material.
wear Use tap with recommended surface coating.

Coolant lacking in lubricating qualities and / Ensure the use of a suitable coolant and an ample
or quantity supply.
Check that coolant is reaching the cutting zone.
Surface of the core hole is compacted Check core hole drilling conditions (drill carefully
to reduce risk of surface compacting).
Check drill cutting edges.
Synchronization Check status of synchronization.
Avoid rigid tapping in materials with high
mechanical properties.

Problem Causes Solutions

Tap breakage Incorrect tap in use (cutting geometry unsuitable Use tap from the relevant materil group.
for application)
Bad swarf evacuation Adapt cutting geometry to the depth to be
tapped.
Adapt length of flutes if necessary.
Centering error Ensure that axes of tap and core hole are aligned.
Blunt tap Re-grind tap.
Ensure that taps are carefully stored.

Tap has reached bottom of the core hole Use tapping spindle with axial float and slipping
clutch.

Core hole too small Select core hole as per chart in the technical part
of this catalogue.

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