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
WIRELESS MICROPHONE VHF
Wireless microphones VHF with frequency modulation (FM) is very convenient when you need to organize one-way communication over a short distance. For example, between residential and...
APPLES – A BOTTLE OF
Now it offers a lot of options, the use of large plastic bottles from under water and juices. I want to share one more: you can make arrangement to collect apples from high branches. To...
