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The workpiece (aluminum-plastic plate) is not fully secured and moved.
Eat knife volume can not be too much, the speed can not be too low, the general domestic aluminum will be sticky knife! Be sure to add lubricity to the cutting fluid. Like 6061 aluminum sticks knife is very powerful, a stick knife immediately back to the knife.
The feeling is that you use the tool wrong. Usually with a knife to cut aluminum-plastic plate only.
