Threaders

Loose thread

Use a tap with tighter tolerance
Reduce feed by 5-10%
Select the correct type of tap for the application
Centre the tapping tool in relation to the hole
Increase the amount of lubrication for better chip evacuation
Increase cutting speed

Tight thread

Use a tap with a looser tolerance, especially if materials tend to shrink
Select the correct type of tap for the application
Increase the amount of lubrication for better chip evacuation
Select the correct drill bit size for pre-drilling the hole

Chip jamming

Select the correct type of tap for the application
Increase the amount of lubrication for better chip evacuation
Adjust hole for correct thread length
Maintain a constant speed during reversing
Select the correct drill bit size for pre-drilling the hole

Breaking

Increase the amount of lubrication for better chip evacuation
Adjust hole for correct thread length
Select the correct drill bit size for pre-drilling the hole
Reduce cutting speed
Reduce the torque of the tapping head

Rapid wear

Select the correct type of tapping tool for the application
Increase the amount of lubrication for better chip evacuation
Reduce cutting speed

Increment formation

Select the right type of tap for the application
Increase the amount of lubrication for better chip evacuation
a better surface finish (coating)
Reduce cutting speed