| PROBLEM |
CAUSES |
SOLUTION |
| Surface Finish |
| Torn or Rough Thread |
Chamfer Too Short |
Increase chamfer length. |
| Wrong Cutting
Angle |
Apply proper cutting angle. |
| Galling |
1. Use thread relieved
taps.
2. Reduce land width.
3. Apply surface treatment such as steam oxide or TiN.
4. Use proper cutting lubricant.
5. Reduce tapping speed.
6. Use larger hole size.
7. Obtain proper alignment between tap and work. |
| Chip Packing |
1. Use spiral pointed
or spiral fluted taps.
2. Use larger drill size. |
| Chattering on
Tapped Thread |
Too Free Cutting |
1. Reduce cutting angle.
2. Reduce amount of thread relief. |
| Tool Conditions |
1. Avoid too narrow a
land.
2. Do not grind the bottom of the flute. |
