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
“SWAN LAKE”
While on vacation in Anapa with a group of tourists during a short-term bus stop near one of the nearby houses saw in the front garden and managed to photograph is my favourite, "a lake...
CANISTER-SURVIVOR
Experienced motorists have long noticed that the cans often "hidatsa" at the bottom corners. To extend the life of canisters, it is recommended to tie the box by rubber bands cut, for...
