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
GAZ-69
The signing of the agreement between Ford Motor company and the government of the USSR on may 31, 1929, was the basis for the establishment at the time the giant automobile plant in...
TAPE-PARACHUTE
European champion 1979, on models of missiles in the category of S-6-A X. Ignota (Spain). In three rounds it model showed the best result, and the fourth, additional, — 3 min. ...
