This video shows the manufacture of a tubular drill for drilling holes in the ground. Detailed video instructions for making a drill.
Drilling a well Ø 180 mm. The technical characteristics of the drill are given, and advice on manufacturing, features of this design are given. The cost of making a drill is indicated.
Also shown are tests on clay soil.

Foundation construction using this drill:    • Беседка 2.0 : Часть 01 - ФУНДАМЕНТ за...  

What's in the video
00:00 - What is a drill for
00:22 - Scrap metal for the manufacture of drill
00:39 - Equalizing the edges of the pipe
01:44 - Marking holes for excavation
02:47 - Cut holes with a grinder
05:09 - Bend back two side knives so that the drill does not jam in the well
05:28 - Exterior of the drill
05:45 - Drill dimensions
06:42 - Unsuccessful bit options
07:14 - Digging process

I would like to note the following points - the handles should be made shorter by 5-10 centimeters (otherwise they cling to the stomach). The glass of borax can be slightly reduced (it is difficult to raise a full one). Raise the windows for soil dumping a little higher (if you have a specific swamp).

As you can see, do-it-yourself hole drill for poles is not at all difficult to make.
Drill # Yamobur # Well # Cylindrical Drill