When machining the motor spindle, we drilled 6 inclined holes with an angle of 60° with the axis of the shaft at the deep hole of one end of the spindle. The hole diameter is φ20～φ30mm. We use the taper shank three-blade reaming drill bit produced by Chengdu Grating Factory to change it into a 60° inclined hole three-blade drill bit, which is used well in production (see picture).
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