In the practice of the house master, there are cases when you need to drill a large diameter hole, and nothing. In this case, will help improvised hollow drill bit, suitable for non-ferrous metals, plastics, wood. It leaves a cylindrical disc, which can also be used, and quite a bit of shavings.
The basis of drill — steel pipe of suitable diameter, the end of which is soldered six cutters made of hard alloy. In the opposite end welded mandrel with Morse taper No. 3 or No. 4.
In the wall of the pipe to make a hole for the exit of chips from the cavity during drilling.
Homemade drill:
1 — bar, 2 — tubular housing, 3 — insert.
V. BEZRUKOV, Vyazemsky, Khabarovsk Krai
Recommend to read
AND THE STUMP WILL COME IN HANDY
The stump on the dacha is usually not only a hindrance but also a problem: to root out its not so easy. However, you can not get rid of it, but rather made to serve. For example, using...
AND THE SEX BEAUTIFUL
Painters love to tell stories about the master, who, fascinated by the coloring of the floor along the walls, not noticed as it stained everything around him and was unpainted on a small...
