To make this tool, the author took old pliers with a broken sponge. (But according to the author, any tool with a hinged halves of the handle, even old scissors, is suitable.)
The author also cut off the second sponge.
Then he put on a grinding wheel at the angle grinder and carried out rough processing.
Then he processed everything with a petal circle.
Then processed on the grinder.
Places where he could not handle on the grinder, the author processed with a drill.
The author will make the tips of the compass out of broken taps. Cut them to the right size and sharpen one edge. (Broken drills will do.)
The author will make holes at the edges of the handles.
Next, the author will process the holes with zinc chloride and solder the tip into the hole in the handle.
Remove excess.
Further, in these places, the author made a hole 2.5 mm in diameter and cut the thread.
Then he cut off a piece of strip from a skewer.
Then the author made several holes in this plate.
Then he drilled them.
Then he processed these holes with a file, first triangular, and then flat.
Then he processed all this with a flat file.
Then on sandpaper.
And at the end with a drill with a scotch-brite nozzle.
After I installed the finished part in its place and secured it with small bolts.
This is what the author’s finished tool looks like.
The minimum size between the jaws is 11 mm.
And the maximum is 147 mm.
Next, the author conducts a test.
Thanks to all. See you in the next article.
Video homemade: