Automatic drilling can not drill holes with a diameter of 1mm
The automatic drilling work, manual micro drill, can be used in high precision micro drill, the range is 0.1-3 mm, you also see the drilling depth, if the diameter 1 mm depth can choose magnetic drill, and the British Nebo magnetic drill E35N this model with twist drill range in 1-13 mm, the premise is to there are 1 mm to two bit, you can refer to the reference!
No, not such a small drill
Yes, the minimum diameter of the auger bored pile is 310 mm;Remark: the diameter of rotary bored pile is different from 310~870 mm, and the diameter is 500, 600 and 700 millimeters. The length of pile is determined according to the resistance of pile end, the characteristic value of pile side resistance, the thickness force of soil layer and the diameter of pile!
