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
BUGGY RACING WITHOUT ROADS
Every Sunday the gates are opened to the sports section "Buggy ERMZ". To the factory yard with the characteristic of motorcycle engines crack go dirt buggy. Today exercise. Guys this day...
THE RESPONSE FROM CHAMBERLAIN
The first years after the conclusion of the London naval agreement of 1930, it caused a massive shift to the construction of light cruisers with 6-inch guns, were relatively quiet. The...
