When drilling holes in vertical parts or concrete wall is not so easy to demonstrate the accuracy and not to make a mess. However, this method makes it easy to solve this problem. Take any flat jar with lid — e.g. an empty box from under the Shoe-Polish, — and pressed her to the wall, start by drilling a hole through it: throw away all drill dust will be inside the jar.
Recommend to read
ACCORDING TO THE PROJECT OF FRIEDRICH ZANDER
25 Nov 1933 soared gird-X — the first Soviet experimental rocket with LRE (liquid rocket engine). It was created in the Gird under the direction of S. P. Korolev on the project and...
CONCRETE… WITH SPIRAL
Any individual developer wants to ease heavy physical labour during various construction works, seeking for opportunities to mechanize. But as is often the case, electricity on the plot...
