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Figure 6 Normal Cutting Speed
2） The inclining backward of sparks indicates too high cutting speed.
Figure 7 Too Fast Cutting Speed
3） Sparks are not dispersed and in a small number and gather together, which indicates too
slow speed.
Figure 8 Too Slow Cutting Speed
➢ Appropriate feeding speed
As shown in the figure, the cutting surface appears with relatively stable lines and there is no
melting stain on the lower part.
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