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
“COCOON” IN THE SNOW
In the late winter of 1974, on the snowy fields near airport "Domodedovo" there was an unusual car, like the egg of a magical bird, the ROC, or a giant cocoon. Leaving behind clouds of...
DRILL — TOOL… CHEF
Many Housewives have in their Arsenal an eggbeater manual ST-2, which can be easily converted into a mixer. It is enough to remove the handle, and the protruding axis to clamp to an...
