In the holes drilled in a wooden tube in the concrete wall, there is always a lot of sand and dust. To remove them will help plastic or metal tube by simply inserting it into the hole and how to blow into it (but mind your eyes!).
S. DOROFEEV, p. vokhtoga, Vologda region.
Recommend to read
DRILL WITH RADIATOR
Modern engineering makes high demands on the materials, and they, in turn, to the machining tools. Not by chance all the exhibitions NTTM necessarily demonstrates the new development of...
SNOWMOBILES: IDEAS AND DESIGNS
Alexander Mikhailovich Zavorotny lives at the station of INTA, near the Arctic circle. In the field of technical creativity, he is no newcomer. He has several original designs...
