Page 248 - Fanar

i Technical Information

5.5. Thread forming Troubleshooting

Problem Solution
Incomplete form of thread

Reduce the drill diameter for tapping hole or apply
the drill diameter according to the selection Table
for forming taps page 270.

Overdone form of thread, too small minor diameter

Increase the drill diameter for tapping hole or
apply the drill diameter according to the selection
Table for forming taps page 270.

Poor quality of thread surface, yanked off material from surface of thread

- Improve lubrication: Use forming taps with oil
grooves
- Increase amount of coolant/lubricant
- Use oil for lubricant
- Use coated forming tap

Tool breaks

- Increase tapping hole diameter
- Increased amount of coolant/lubricant
- Apply cover coating preventing
sticking of material being processed
- Check compliance of workpiece with
recommendations regarding its plasticity and
hardness

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