The reamer with negative edge angle λ_(?) has gradually attracted people's attention. Although it is limited to machining through-hole straight reamer, it can be used for steel, cast iron and on ordinary vertical drilling machines, radial drilling machines and lathes. The hole finishing of the light alloy material after drilling makes the hole precision stable at 7 and the surface roughness R_(?)1.6. Due to the inclination of the blade, the chips are removed forward, and no congestion is caused.
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