Cause |
Solution / Countermeasures |
| Insufficient clamping |
Check if clamping is completed. |
| Insufficient tool insertion length |
Keep minimum insertion length. |
| Tool shank diameter is smaller than |
Use h7 shank tool instead. |
Cutting resistance is too large.
(Pullout by pestle-like movement.)
→ Bending moment is too large. |
Cutting resistance should be lowered.
ａ :Higher rotation or lower feed rate
（Approx. 20%)
ｂ : Lower cutting depth
ｃ : Shorter tool projection length |
| Chuck rigidity is too low. |
Use another type of tool holder.
(such as side locl endmill holders) |
Cause |
Solution / Countermeasures |
| Chattering by chuckr's resonance |
Shift rotation speed to vary resonance frequency.
（± 10％ and above） |
| Insufficient clamping |
Check if clamping is completed. |
| Insufficient tool insertion length |
Keep minimum insertion length. |
| Tool shank diameter is smaller than h7 |
Use h7 shank tool instead. |
| The amount of cutting is a little, and the slipping phenomenon on the grinding surface by swinging of the blade is generated. |
Revision of cutting conditions (Higher cutting resistance)
a : Higher feed rate or lower rotation
(Approx. 20%)
b : Higher depth of cut |
Cutting resistance is too high in comparidon
with the chuck's rigidity. |
・Revision of cutting conditions
(Lower cutting resistance)
a : Lower feed rate or higher rotation
(Approx. 20%)
b : Lower depth of cut
・Use bigger tool chuck.
・Shorter tool projection length
・Shorter tool chuck length |
Insufficient chcuking force at nose because
of using MC collet (mainly
12mm and below) |
Recommendation of collet chucks instead |
| Holder withdrawing power shortage because of defective selection of retention bolt |
Use designated retention stud for M/C |
| Defect per taper due to swelling of BT shank by tightening retention bolt too much |
Keep recommended torque value for tightening retention
stud. |
Cause |
Solution / Countermeasures |
| Interference with ATC arm |
・Check L0 dimension on our catalog and aximum tool
dimension for the M/C.
・Revision of tool chuck size. |
| Overload for ATC capacity |
Check maximum load for ATC. |
| Maximum allowable moment for the
M/C is exceeded. |
Check maximum allowable moment for M/C. |
| Clamp movement of ATC is not synchronized. |
Consult with the machine tool builder. |
Cause |
Solution / Countermeasures |
| Rust, damage or deformation of chuck
ID and collet. |
・Replacement of chuck or tool
・Touching up of area in question（rubbing off with sand
paper ＃1000 and above）
Correction (grinding) by NT TOOL is not possible. |
| Insufficient tool insertion length |
Keep minimum insertion length. |
| Scratch or dent on tool shank |
Touching up of scratch or dent |
| Notch or flat on tool shank |
Use tool without notch or flat. |
| Expansion of BT shank because of
over-tightening retention stud. |
Keep recommeneded torque value for toghtening retention
stud. |
| Poor accuracy of tool |
Replacement of tools. |
| Dust seizing in the chucking part |
Cleaning of chuck ID and collet |
Deteriorated accuracy of tool interface
・Large runout (2 micrometers and above) of spindle
ID or end face (in the case of two-face contact)
・Dust, scratch or dent on taper area or end face (in
the face of two-face contact) |
・Regrinding or correction of machinespindle
・Cleaning of taper and end face (in the case of twoface
contact), touching up of scratch or dent |
