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
POURS MEMBRANE
Experienced gardeners watering the beds in their gardens and backyards only warm water supernatant. To do this, they fill placed on the site of the barrels in the morning and consume the...
TWO IN ONE
The idea is to make two-cylinder engine came to us with the son, that is, from want. In times of General scarcity in the economy was necessary for some vehicles to have the house and...
