Troubleshooting Application problems with new taps
Thread produced is too large
Possible causes
Solution
incorrect tap, tap geometry not suitable
apply correct tap for the material
tapping size hole too small
observe tapping size hole table in the
alignment error of tapping
- check for correct tool clamping
machine spindle axially restricted
- use mechanical feed
cold welding at the flank
- apply new tap
lead of tap unsatisfactory due
- tap with forced feed
cutting speed too high
- reduce cutting speed
lubrication or coolant supply
ensure sufficient and suitable
tolerance specification on tap does
apply correct tap for required
spiral-fluted taps,
with spiral-fluted taps only light pressure
initial tapping pressure too
taps with spiral point or left hand spiral
tolerance specification on tap does not
apply correct tap for required
incorrect tap
apply correct tap for the material to be
tap does not cut accurately
avoid strong axial forces during the
machine spindle is axially too rigid
apply tension/compression chuck
for the application
size hole or position
of the tap
to insufficient thread depth
insufficient
not correspond to specifications on drawing and/or thread gauge
Thread axially miscut
corresponding to our design, are applied with too much pressure for initial tapping
low for taps with spiral point corresponding to our form “B”
Thread produced is too small
correspond to specifications on drawing and/or thread gauge
(thread plug gauge)
to be machined
technical section. Note different tapping size hole diameters for fluteless taps.
- apply floating tap holder - check core drill
- apply tension/compression tap chuck
- apply coated tap - optimise lubrication
- apply tap with modified lead
- improve lubrication
coolant supply and check concentration
tolerances
required for initial tapping. The tap should immediately be applied within the tension/compression range
require higher axial pressure. Ensure tap operates within the tension/ compression range
tolerance
Threading tools
Problem
machined
cutting process
1641