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
TRUCK-TRUCK
Usual shopping trolley is easy to adapt for transportation of bulk household items, if using metal corners or tubular elements from the old clamshells to increase cargo area, and if...
SIMPLE, AS A SLEDGE
My snowmobile which I called "Ayavrik", simple in construction, as intended to overcome huge snowdrifts. I was built for moving from hole to hole for ice fishing on a snow-covered ice,...
