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
LEGO CAR TO DRIVE AROUND
Australian Steve Sammartino (Steve Sammartino) and Raul Romanians Aida (Raul Oaida) presented the car on the pneumatic actuator, assembled from parts designer LEGO. The car accommodates...
LAND PADDLE
KAYAK FOR... ICE. Who has ever tried to sit in the kayak, he knows how difficult it is to manage. Coaches have to be pretty to work with young athletes before they themselves rush...
