Incorrect Diameter or Pitch of Threads:
1. Check to be sure the correct style of tap is used and it is the correct diameter and thread pitch.
2. Be sure the drilled hole is not oversize or undersize.
3. Be sure the correct tapping G code is active.
4. Make sure the no X axis tool offsets are applied.
5. Make sure the hole to be tapped is straight.
Faulty Thread Form:
1. Make sure the tap is sharp and coolant is reaching the hole to clear chips during the cycle.
2. If a floating holder is used, make sure the proper amount of float occurs and that the holder is properly aligned with the workpiece.
3. Make sure the hole to be tapped is straight.
4. Make sure the drilled hole is not undersized or oversize.
5. If chips are packing into the flutes, use a fast spiral tap.
6. Reduce the overall tapping speed and the withdrawl speed.
Poor Thread Finish:
1. Check to be sure the correct style of tap is used and it is the correct diameter and thread pitch.
2. Be sure the correct coolant is used for the material being machined.
3. Reduce the overall tapping speed and the withdrawl speed.
Damaged Tap:
1. Make sure the hole depth is correct.
2. Select the style of tap for the blind or through-hole to be tapped.
3. Make sure the hole is not undersize.
4. Be sure the correct tapping cycle is active.
5. Make sure no X axis offsets apply to the tool.
6. Make sure the correct coolant type and viscosity is being used.
7. Material hardness may not be correct, or there may be hard spots in the material.