LARGE DIAMETER? DO

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
 
Homemade drill:
 
1 — bar, 2 — tubular housing, 3 — insert.
V. BEZRUKOV, Vyazemsky, Khabarovsk Krai

Recommend to read

  • GRANDPA “TRABANT”GRANDPA “TRABANT”
    Cars with front-wheel drive today is not a novelty: they are building nearly three dozen firms. Prosperity "front-drive" started in the sixties. But in the thirties several of the...
  • WEAPONS AIR FIGHTERSWEAPONS AIR FIGHTERS
    The followers of Cordoba modeling we offer today a selection of two closely-related within the meaning of materials. In the first of them tells of a very successful training model, which...