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
The ZIS-110
Since 1936 the Automobile plant named after Stalin (ZIS) in addition to the famous "trentodoc" ZIS-5 was produced and Executive cars. The first limo was the ZIS-101, was designed by the...
SKEWER SAUSAGES FOR…
Sausages, as is known, before use should be boiled. In marching conditions it is not always possible, and attempt to reheat them over the fire, netknow on something sharp, fails heated,...
