Very often, a broken drill should just throw it away because of the inability to even re-ground it. However, it can be converted into a punch. It is enough to the breaking point to make the angle marked in the figure. For such an operation better suited for the drill of large diameter. This punch will make it easier to obtain holes in concrete. Slightly after each hammer blow, the punch should be slightly rotated around the axis.
L. ANDARALO, M and n s K, Belarus
Recommend to read
CRUISER UNDER THE “TRIDENT MISSILE”
Unlike Britain, the United States emerged from the Second world war, not only without any significant losses in the cruising part, but, on the contrary, with a fair surplus. Despite the...
IN THE ARSENAL OF THE MECHANIC
Great interest among specialists of national economy and young workers caused held at the VDNKH all-Union review of achievements locksmiths innovators. This eloquent entry in the...
