Somta - page 90

80
Tap Breakage
(a) Possible Cause
Using the incorrect tap.
Solution
Use the recommended tap.See page 51/54.
(b) Possible Cause
The tap is too dull
Solution
Use a tap which is in good condition.
(c) Possible Cause
The drilled hole is too small.
Solution
Use the recommended tapping drill size.See page 55/61.
(d) Possible Cause
The drilled hole is too shallow.
Solution
Allow clearance at the bottom of the hole when drilling.
(e) Possible Cause
Mis-alignment of the tap and the hole.
Solution
Care must be taken to align the tap with the hole before starting
to tap.
(f) Possible Cause
The flutes are clogged with chips.
Solution
Use a spiral point or spiral flute tap.
(g) Possible Cause
Excessive tapping speed is applied.
Solution
Use the recommended tapping speed.See page 63-65.
(h) Possible Cause
The tap holding device is not suitable.
Solution
Use the appropriate tapping attachment.
(i) Possible Cause
The work material is work hardened.
Solution
Use serial taps.
(j) Possible Cause
Lack of / or the wrong type of lubricant.