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
FLOATING ARMORED VEHICLES FOR THE RED ARMY
In the thirties of the last century in Germany was issued a Handbook Heigle "Tanks" for many years and then enjoyed great popularity among the military specialists. Already in the first...
TRACTOR TRAILER DUMP TRUCK
The process of transportation of any cargo is always the sum of three components: loading, delivery and unloading. Suppose the goods are transported to the farmyard. The moment of...
