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
TWO TASKS OF ELECTROPLATEA
For cooling microelectrodes rotating propeller for flying model aircraft, usually set just before small anchor impeller. It blows air through the casing of the motor. The most...
Sandwich chimneys: design and benefits
One of the essential elements of the furnace chimney. With its help output products of combustion. Such an element can be of different types. Now widespread sandwich chimneys, which are...
