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Chip shape during tapping
Chip shape during tapping
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Answer
If the chips are thin and short, they can be considered to have a good shape that is easy to discharge.
If the chips are thick and long, there is a risk that they may get caught in the tap, so caution is required.
For spiral‑fluted taps, chips are discharged in the opposite direction to the feed direction of the tap.
If the chips are poorly formed, they may become trapped between the tap and the machined thread, causing problems.
When the cutting speed is appropriate, the chips tend to form in a shape that is easy to evacuate (narrow curl and fine pitch).
In addition, deep‑hole machining inevitably produces a large volume of chips, making chip evacuation more difficult because the chips become long.
In tapping, when the machining depth exceeds two times the tool diameter (2D), it is considered deep‑hole machining.
[ spiral fluted tap how to determine the shape of chips during processing ]
| 1m/min(20min-1) | Easy to bite into the tap |
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| 2m/min(40min-1) | Easy to bite into the tap |
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| 5m/min(100min-1) | Easy to bite into the tap |
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| 7.5m/min(150min-1) | Easy to drain chips |
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| 10m/min(200min-1) | Easy to drain chips |
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| 12.5m/min(250min-1) | Easy to drain chips |
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| 15m/min(300min-1) | Easy to bite into the tap |
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| 20m/min(400min-1) | Easy to bite into the tap |
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| Test article | |
| Product name and size material precision |
EX-SFT HSSE OH2 |
| Test conditions | |
| Workpiece materials Rotational speed Pilot hole Threaded length Cutting fluids Machines used |
SS400 20,40,100,150,200,250,300,400(min-1) Φ15×25mm 25mm non-soluble oil Horizontal CNC machining center |