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
THE QUARTET WITH THE FOUR RINGS
Middle class car AUDI A4. Firm Audi appeared in 1910, when August Horch, who had, according to his contemporaries, a very obstinate character, did not get along with his partners, who...
MODE WIG
Read in the "Modeller-designer" interesting article on the new generation car with aerobrigada, the boys from the circle, which I direct, has decided to develop the proposed innovation....
