- Upward and Downward cutting
Comparison 
Back lash of the feed screw | No influence in cutting | The black lash has to be removed completely |
Rigidity of the structure | No influence in case of the low rigidity | The high rigidity is needed for the stroke |
Durability of the cutting edge | It’s disadvantageous because it lifts the structure upward and the force goes up | Because the force comes down and presses the structure but when it’s not installed completely, the materials can be flown to the sky with that force. |
Influence of the bulit-up edge | Shorter durability of the flank wear with the fiction during insertion | Longer durability |
Friction resistance | Rather low | The friction force during the insertion is low but its stroke can be high to the downward |
Finished surface | For the higher friction resistance during insertion, the force to lift upward is high | There is no glossy surface but the rotation resistance during the low feed cannot be occurred so all the surface is rather glossy and even. The finished surface is more glossy than the upward cutting but in case of the soft materials the finished surface can be worsened. |
Cutting condition | It raises the cutting speed and feed more than the upward cutting. It’s possible to cut the heavy materials |
- Coolant
The coolant is to improve the lubrication, cooling and anti-fusion property so increase the durability and grade of the processed surface, and removes the cutting heat, reduces the generation power and add the productivity like the cleansing effect of the micro chips.
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