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
HOUSE FOUR-LEGGED FRIEND
If you decide to get a dog, first of all determine where she will live. Usually when the content for it will be the most peaceful place corridor (to place the dog in a draft in the...
“HEDGEHOG”PUZZLE
Not privy to his secret for a long time to turn this wooden "hedgehog" in my hands, trying to figure out how he knows and not full at all if he is so closely connected with each other...
