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If the chips are thin and short, it can be said that it is a good shape that is easy to discharge.
If the chips are thick and long, there is a risk of them getting caught in the tap, so you need to be careful.
In the case of spiral fluted tap , chips are discharged in the opposite direction to the direction of travel of the tap, so if the chips are in poor shape, chips may get caught between the tap and the machined screw, causing trouble.
If the cutting speed is suitable, the shape will be easy to eject chips (narrow curl and fine pitch).
In addition, the machining of deep holes inevitably requires a large amount of cutting, which makes it difficult to process because the chips are long.
In tap machining, if the tool diameter ÷ the machining length exceeds 2 times (2D), it is considered a deep hole.
[ 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 |