The bit rotates about the vertical shaft and moves in the axial direction. The soil is cut under the action of the torque and axial force of the bit, and is crushed and crushed by the compression and centrifugal force of the working blade, forming the earth flow toward the wall and ascending to the surface along the page. When the soil flow to the pit wall barrier at the time, due to the centrifugal force around the broken soil thrown into the pit, to complete the whole process of digging.
The drill bit is clamped on the ordinary hand drill, and the finger is used to select the lower speed of the switch. If you want to drill holes will not collapse, then drill a part from the side, and then turn over the surface drilled through.
With the drill bit in the hole on the glass, water glass drill bit 80 degree angle at the hole grooves and then gradually transferred to a glass surface 90 degrees vertical to continue drilling, and continue to add water cooling the drill bit when drilling, 5mm stopped the machine out the bit within the glass pieces and then drilling. Clean up until the desired depth is reached.
