Someone had to drill holes in the ceiling, he knows, as a way to work from the dust and concrete crumbs. Ways to protect the face exist. One of them use dust cups — often plastic caps from aerosols. However, such improvised traps are ineffective: a glass, put on the drill bit rotates with the same peripheral speed and scatters, like a centrifuge, something that needs to collect.
This will not happen if we refuse to cylindrical or flared up the shape of the glass n to apply a tapered shape (the bottom part of the bottle of shampoo). Then centrifugal force will press the concrete “sawdust” to the bottom.
The dust-collecting device:
1 — drill, 2 — Cup, 3 — sleeve, 4 — nut.
But in this case it is difficult to provide a complete olulisemate crumbs, plus as it is distributed over the bottom unevenly and at any time may fall suddenly from the tilted Cup, which is held on the drill just the bottom. Here and help steel axle tube (see figure). First, disappear roll, and secondly, because the bushing PA drill is worn freely, the trap will have a smaller oboroti. Will decrease the centrifugal force.